Dobrica Pavlinušić's random unstructured stuff

Toshiba AC100: Revision 43

Tegra 2 device

kernel

https://gitlab.com/groups/ac100 (gitorious is dead)

cpuinfo

$ cat /proc/cpuinfo
Processor       : ARMv7 Processor rev 0 (v7l)
processor       : 0
BogoMIPS        : 1998.84

Features        : swp half thumb fastmult vfp edsp vfpv3 vfpv3d16 
CPU implementer : 0x41
CPU architecture: 7
CPU variant     : 0x1
CPU part        : 0xc09
CPU revision    : 0

Hardware        : NVIDIA Harmony Development System
Revision        : 0000
Serial          : 0000000000000000

$ cat /proc/meminfo
MemTotal:         383348 kB
MemFree:          106528 kB
Buffers:           30116 kB
Cached:           123316 kB
SwapCached:            0 kB
Active:           164792 kB
Inactive:          85020 kB
Active(anon):      96692 kB
Inactive(anon):        0 kB
Active(file):      68100 kB
Inactive(file):    85020 kB
Unevictable:           0 kB
Mlocked:               0 kB
SwapTotal:             0 kB
SwapFree:              0 kB
Dirty:                 0 kB
Writeback:             0 kB
AnonPages:         96412 kB
Mapped:            44536 kB
Shmem:               312 kB
Slab:               8940 kB
SReclaimable:       4848 kB
SUnreclaim:         4092 kB
KernelStack:        2528 kB
PageTables:         8324 kB
NFS_Unstable:          0 kB
Bounce:                0 kB
WritebackTmp:          0 kB
CommitLimit:      191672 kB
Committed_AS:    6569284 kB
VmallocTotal:     614400 kB
VmallocUsed:       30656 kB
VmallocChunk:     520068 kB

Rooting

nvflash

Press CTRL + ESC + power button to get into APX mode

[Thu Oct 11 06:31:57 2018] usb 2-2.4: new high-speed USB device number 13 using xhci_hcd
[Thu Oct 11 06:31:57 2018] usb 2-2.4: New USB device found, idVendor=0955, idProduct=7820, bcdDevice= 1.02
[Thu Oct 11 06:31:57 2018] usb 2-2.4: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[Thu Oct 11 06:31:57 2018] usb 2-2.4: Product: APX
[Thu Oct 11 06:31:57 2018] usb 2-2.4: Manufacturer: NVIDIA Corp.

http://tegradeveloper.nvidia.com/tegra-android-development-pack

In theory. In practice driver package from

http://developer.download.nvidia.com/assets/mobile/files/tegra-linux-12.alpha.1.0.tar.gz

is everything you need. It's from http://developer.nvidia.com/content/linux-tegra-release-12-alpha-1-released

fastboot.stock.bin

t61p:/home/dpavlin/Downloads/ldk/bootloader/alt# wget https://github.com/muromec/putusb/raw/master/bin/fastboot.stock.bin
--2011-09-12 20:40:17--  https://github.com/muromec/putusb/raw/master/bin/fastboot.stock.bin
Resolving github.com (github.com)... 207.97.227.239
Connecting to github.com (github.com)|207.97.227.239|:443... connected.
HTTP request sent, awaiting response... 302 Found
Location: https://raw.github.com/muromec/putusb/master/bin/fastboot.stock.bin [following]
--2011-09-12 20:40:19--  https://raw.github.com/muromec/putusb/master/bin/fastboot.stock.bin
Resolving raw.github.com (raw.github.com)... 207.97.227.243
Connecting to raw.github.com (raw.github.com)|207.97.227.243|:443... connected.
HTTP request sent, awaiting response... 200 OK
Length: 936016 (914K) [application/octet-stream]
Saving to: `fastboot.stock.bin'

100%[=====================================================>] 936,016      645K/s   in 1.4s    

2011-09-12 20:40:22 (645 KB/s) - `fastboot.stock.bin' saved [936016/936016]

t61p:/home/dpavlin/Downloads/ldk/bootloader/alt# md5sum fastboot.stock.bin 
9197365fb42c5801b4124e75ea00512c  fastboot.stock.bin

backup

Following instructions at http://gitorious.org/ac100/pages/Installation

t61p:/home/dpavlin/Downloads/ldk/bootloader# ./nvflash --bl fastboot.stock.bin --go
Nvflash started
rcm version 0X20001
System Information:
   chip name: t20
   chip id: 0x20 major: 1 minor: 2
   chip sku: 0x8
   chip uid: 0x1700618943a00317
   macrovision: disabled
   hdcp: enabled
   sbk burned: false
   dk burned: false
   boot device: emmc
   operating mode: 3
   device config strap: 0
   device config fuse: 0
   sdram config strap: 0

downloading bootloader -- load address: 0x108000 entry point: 0x108000
sending file: fastboot.stock.bin
| 936016/936016 bytes sent
fastboot.stock.bin sent successfully
waiting for bootloader to initialize
bootloader downloaded successfully


t61p:/home/dpavlin/Downloads/ldk/bootloader# ./nvflash -r --getpartitiontable partitiontable.txt
Nvflash started
[resume mode]
Succesfully updated partition table information to partitiontable.txt


t61p:/home/dpavlin/Downloads/ldk/bootloader# ./nvflash -r --read 2 part-2.img
Nvflash started
[resume mode]
receiving file: part-2.img, expected size: 3145728 bytes
/ 3145728/3145728 bytes received
file received successfully
t61p:/home/dpavlin/Downloads/ldk/bootloader# ./nvflash -r --read 3 part-3.img
Nvflash started
[resume mode]
receiving file: part-3.img, expected size: 524288 bytes
/ 524288/524288 bytes received
file received successfully
t61p:/home/dpavlin/Downloads/ldk/bootloader# /nvflash -r --read 4 part-4.img
bash: /nvflash: No such file or directory
t61p:/home/dpavlin/Downloads/ldk/bootloader# ./nvflash -r --read 4 part-4.img
Nvflash started
[resume mode]
receiving file: part-4.img, expected size: 2097152 bytes
/ 2097152/2097152 bytes received
file received successfully
t61p:/home/dpavlin/Downloads/ldk/bootloader# ./nvflash -r --read 5 part-5.img
Nvflash started
[resume mode]
receiving file: part-5.img, expected size: 5242880 bytes
/ 5242880/5242880 bytes received
file received successfully
t61p:/home/dpavlin/Downloads/ldk/bootloader# ./nvflash -r --read 6 part-6.img
Nvflash started
[resume mode]
receiving file: part-6.img, expected size: 8388608 bytes
/ 8388608/8388608 bytes received
file received successfully
t61p:/home/dpavlin/Downloads/ldk/bootloader# ./nvflash -r --read 7 part-7.img
Nvflash started
[resume mode]
receiving file: part-7.img, expected size: 1048576 bytes
/ 1048576/1048576 bytes received
file received successfully
t61p:/home/dpavlin/Downloads/ldk/bootloader# ./nvflash -r --read 8 part-8.img
Nvflash started
[resume mode]
receiving file: part-8.img, expected size: 314572800 bytes
/ 314572800/314572800 bytes received
file received successfully
t61p:/home/dpavlin/Downloads/ldk/bootloader# ./nvflash -r --read 9 part-9.img
Nvflash started
[resume mode]
receiving file: part-9.img, expected size: 419430400 bytes
/ 419430400/419430400 bytes received
file received successfully
t61p:/home/dpavlin/Downloads/ldk/bootloader# ./nvflash -r --read 10 part-10.img
Nvflash started
[resume mode]
receiving file: part-10.img, expected size: 2097152 bytes
/ 2097152/2097152 bytes received
file received successfully
t61p:/home/dpavlin/Downloads/ldk/bootloader# ./nvflash -r --read 11 part-11.img
Nvflash started
[resume mode]
receiving file: part-11.img, expected size: 524288 bytes
/ 524288/524288 bytes received
file received successfully
t61p:/home/dpavlin/Downloads/ldk/bootloader# ./nvflash -r --read 12 part-12.img
Nvflash started
[resume mode]
receiving file: part-12.img, expected size: 1294991360 bytes
/ 1294991360/1294991360 bytes received
file received successfully
t61p:/home/dpavlin/Downloads/ldk/bootloader# ./nvflash -r --read 13 part-13.img
Nvflash started
[resume mode]
receiving file: part-13.img, expected size: 524288 bytes
/ 524288/524288 bytes received
file received successfully
t61p:/home/dpavlin/Downloads/ldk/bootloader# ./nvflash -r --read 14 part-14.img
Nvflash started
[resume mode]
receiving file: part-14.img, expected size: 5891424256 bytes
/ 5891424256/5891424256 bytes received
file received successfully

Linux

phh 2.6.32 kernel with working suspend and audio

http://salaliitto.com/~gildean/ac100/wiki/phh/

t61p:/home/dpavlin/ac100/linux4tegra_10.9.3# LD_LIBRARY_PATH=./nvflash/ ./nvflash/nvflash --bl ./prebuilt/fastboot.stock.bin --read 6 tegra_partition_6.bin --go
Nvflash started
rcm version 0X20001
System Information:
   chip name: t20
   chip id: 0x20 major: 1 minor: 2
   chip sku: 0x8
   chip uid: 0x1700618943a00317
   macrovision: disabled
   hdcp: enabled
   sbk burned: false
   dk burned: false
   boot device: emmc
   operating mode: 3
   device config strap: 0
   device config fuse: 0
   sdram config strap: 0

downloading bootloader -- load address: 0x108000 entry point: 0x108000
sending file: ./prebuilt/fastboot.stock.bin
| 936016/936016 bytes sent
./prebuilt/fastboot.stock.bin sent successfully
waiting for bootloader to initialize
bootloader downloaded successfully
receiving file: tegra_partition_6.bin, expected size: 8388608 bytes
/ 8388608/8388608 bytes received
file received successfully



t61p:/home/dpavlin/ac100/linux4tegra_10.9.3# LD_LIBRARY_PATH=./nvflash/ ./nvflash/nvflash --wait --bl ./prebuilt/fastboot.stock.bin --download 6 ../32.boot.menu.v1.img --go
Nvflash started
rcm version 0X20001
System Information:
   chip name: t20
   chip id: 0x20 major: 1 minor: 2
   chip sku: 0x8
   chip uid: 0x1700618943a00317
   macrovision: disabled
   hdcp: enabled
   sbk burned: false
   dk burned: false
   boot device: emmc
   operating mode: 3
   device config strap: 0
   device config fuse: 0
   sdram config strap: 0

downloading bootloader -- load address: 0x108000 entry point: 0x108000
sending file: ./prebuilt/fastboot.stock.bin
| 936016/936016 bytes sent
./prebuilt/fastboot.stock.bin sent successfully
waiting for bootloader to initialize
bootloader downloaded successfully
sending file: ../32.boot.menu.v1.img
/ 8388608/8388608 bytes sent
../32.boot.menu.v1.img sent successfully

mainline kernel

Newest howto for arch: https://gist.github.com/Nokius/81cd46405b537931a472e0a55abb7ccd

https://archlinuxarm.org/forum/viewtopic.php?f=49&t=10116

u-boot from APX

This should allow you to send u-boot, kernel and initramfs to any tegra2 board which can be in APX mode without
modifying internal storage.

build u-boot

dpavlin@klin:/klin/u-boot$ cat env.sh 
export CROSS_COMPILE="arm-none-eabi-" ARCH=arm
dpavlin@klin:/klin/u-boot$ . env.sh 

dpavlin@klin:/klin/u-boot$ make paz00_defconfig

make

build kernel

dpavlin@klin:/klin/Tegra/linux$ git remote -v
origin  https://github.com/grate-driver/linux (fetch)
origin  https://github.com/grate-driver/linux (push)
samsung-tab-10.1        https://github.com/Decatf/linux (fetch)
samsung-tab-10.1        https://github.com/Decatf/linux (push)

dpavlin@klin:/klin/Tegra/linux$ git branch -vv
* master 63a6317580f8 [origin/master] ARM: tegra: Clear EMC interrupts on resume from LP1 on Tegra30+

dpavlin@klin:/klin/Tegra/linux$ cat /klin/u-boot/env.sh 
export CROSS_COMPILE="arm-none-eabi-" ARCH=arm
dpavlin@klin:/klin/Tegra/linux$ . /klin/u-boot/env.sh

dpavlin@klin:/klin/Tegra/linux$ make tegra_defconfig

make

create initrd with new modules

dpavlin@klin:/klin/Tegra/linux$ cat tegra-ramdisk.sh 
#!/bin/sh -xe

test -d initrd && rm -Rf initrd

mkdir initrd
cd initrd

gzip -cd  /tmp/initrd.img | fakeroot -- cpio -i -d -H newc --no-absolute-filenames

rm -R lib/modules/*

cd ..
make modules_install INSTALL_MOD_PATH=initrd/ INSTALL_MOD_STRIP=1

cd initrd

find . | cpio -o -R 0:0 -H newc > ../initrd.new.cpio

cd ..

gzip -f -6 initrd.new.cpio

/klin/u-boot/tools/mkimage -A arm -O linux -T ramdisk -C gzip -n uInitrd -d initrd.new.cpio.gz uInitrd.new

run it to create initrd:

dpavlin@klin:/klin/Tegra/linux$ ./tegra-ramdisk.sh 

Image Name:   uInitrd
Created:      Fri Oct 12 11:20:42 2018
Image Type:   ARM Linux RAMDisk Image (gzip compressed)
Data Size:    4082917 Bytes = 3987.22 KiB = 3.89 MiB
Load Address: 00000000
Entry Point:  00000000

create bootloader file

latest version seems to be: https://gitlab.com/uboot-ac100/create_bootimage.git

dpavlin@nuc:/nuc/Tegra/ac100/create_bootimage/example$ ../create_image.pl /mnt/klin/klin/u-boot/u-boot-dtb-tegra.bin /m
nt/klin/klin/Tegra/linux/arch/arm/boot/zImage /tmp/postmarketOS-export/initrd.img /mnt/klin/klin/Tegra/linux/arch/arm/b
oot/dts/tegra20-paz00.dtb uboot.scr boot.img
Creating boot image for tegrarcm ...

./tmp_uboot.scr
image layout:
section  loadaddr       size
=================================
uboot   : 0x108000      505627
kernel  : 0x190000      6485800
initrd  : 0x7c0000      4082981
fdt     : 0xbb0000      29659
script  : 0xbc0000      226

image written to boot.img

Now press CTRL + ESC + power on to enter APX mode

dpavlin@nuc:/nuc/Tegra/ac100/create_bootimage/example$ sudo apt-get install libcrypto++6

dpavlin@nuc:/nuc/Tegra/ac100/create_bootimage/example$ /mnt/klin/klin/Tegra/tegrarcm/src/tegrarcm --bct paz00-micron-toshiba-8g.bct --bootloader boot.img --loadaddr 0x108000 
bct file: paz00-micron-toshiba-8g.bct
bootloader file: boot.img
load addr 0x108000
entry addr 0x108000
device id: 0x7820
uid:  0x1700618943a00317
RCM version: 2.1
downloading miniloader to target at address 0x40008000 (132976 bytes)...
miniloader downloaded successfully
Chip UID:                0x00000000000000001700618943a00317
Chip ID:                 0x20
Chip ID Major Version:   0x1
Chip ID Minor Version:   0x2
Chip SKU:                0x8 (t20)
Boot ROM Version:        0x1
Boot Device:             0x2 (EMMC)
Operating Mode:          0x3 (developer mode)
Device Config Strap:     0x0
Device Config Fuse:      0x0
SDRAM Config Strap:      0x0
sending file: paz00-micron-toshiba-8g.bct
- 4080/4080 bytes sent
paz00-micron-toshiba-8g.bct sent successfully
sending file: boot.img
- 11239650/11239650 bytes sent
boot.img sent successfully

u-boot loads detects initrd (it's small enough thanks to MODULES_STRIP to be detected without CRC errors) but no output from kernel.

https://archlinuxarm.org/forum/viewtopic.php?f=23&t=10044&p=51142&hilit=ac100#p51142

suggests CONFIG_TEGRA_DEBUG_UARTA instead of CONFIG_TEGRA_DEBUG_UART_AUTO_ODMDATA but it doesn't work for me.

dpavlin@klin:/klin/Tegra/linux$ grep 'TEGRA.*UART' .config
# CONFIG_TEGRA_DEBUG_UART_AUTO_ODMDATA is not set
CONFIG_TEGRA_DEBUG_UARTA=y
# CONFIG_TEGRA_DEBUG_UARTB is not set
# CONFIG_TEGRA_DEBUG_UARTC is not set
# CONFIG_TEGRA_DEBUG_UARTD is not set
# CONFIG_TEGRA_DEBUG_UARTE is not set
CONFIG_DEBUG_TEGRA_UART=y

serial port

https://ac100.grandou.net/serial_port_modification

The serial port is the JP1 connector, near the left speaker connector. Pinout, from right to left:

1 - in - RX UART1
2 - out - TX UART1
3 - out - T20_WAKE#
4 - out - +3V
5 - out - +1.8V
6
7
8 - in - SYSTEM_RESET#
9 - in - EC_TX80_PDATA
10 - in - GND

I decided to solder GND to outer pin of connector to the right of pin 1 as opposed to other side of connector.

After that, a peace of capton tape was put over solder connectors to somewhat re-enforce them and provide insulation
to keyboard cover.

Serial is 3.3V, 115200 8n1.

Output is:

dpavlin@nuc:/nuc/Tegra$ microcom -p /dev/ttyUSB2
connected to /dev/ttyUSB2
Escape character: Ctrl-\
Type the escape character to get to the prompt.

U-Boot SPL 2018.11-rc1-00130-g0a60a81ba3 (Oct 12 2018 - 11:18:01 +0200)
Trying to boot from RAM


U-Boot 2018.11-rc1-00130-g0a60a81ba3 (Oct 12 2018 - 11:18:01 +0200)

TEGRA20
Model: Toshiba AC100 / Dynabook AZ
Board: Compal Paz00
DRAM:  512 MiB
MMC:   sdhci@c8000000: 1, sdhci@c8000600: 0
Loading Environment from MMC... *** Warning - bad CRC, using default environment

In:    serial
Out:   vidconsole
Err:   vidconsole
Net:   No ethernet found.
Hit any key to stop autoboot:  0
## Executing script at 00b30000
## Loading init Ramdisk from Legacy Image at 00700000 ...
   Image Name:   uInitrd
   Image Type:   ARM Linux RAMDisk Image (gzip compressed)
   Data Size:    4269789 Bytes = 4.1 MiB
   Load Address: 00000000
   Entry Point:  00000000
   Verifying Checksum ... OK
## Flattened Device Tree blob at 00b20000
   Booting using the fdt blob at 0xb20000
   Using Device Tree in place at 00b20000, end 00b2a3da

Starting kernel ...


Error: invalid dtb and unrecognized/unsupported machine ID
  r1=0x00000c38, r2=0x00000000
Available machine support:

ID (hex)        NAME
ffffffff        Generic DT based system
ffffffff        NVIDIA Tegra SoC (Flattened Device Tree)

Please check your kernel config and/or bootloader.

According to http://billauer.co.il/blog/2014/02/uboot-linux-dtb-fdt-device-tree/ this means that kernel didn't found valid device tree and tries to detect board usin machine ID registrars.

Solution for this seems to use u-boot variables for loading kernel, ramfs and dtb as opposed to values which script creates,
so this works (loading from usb keychain):

fatload usb 0:1 ${kernel_addr_r} /boot/zImage
fatload usb 0:1 ${fdt_addr_r} /boot/tegra20-paz00.dtb
fatload usb 0:1 ${ramdisk_addr_r} /boot/uInitrd.new
bootz ${kernel_addr_r} ${ramdisk_addr_r} ${fdt_addr_r}

Here are also known working addresses which u-boot uses:

Tegra20 (Paz00) MOD # echo ${kernel_addr_r}
0x01000000
Tegra20 (Paz00) MOD # echo ${fdt_addr_r}
0x02000000
Tegra20 (Paz00) MOD # echo ${ramdisk_addr_r} 
0x02100000

so much higher in memory map than create_image script. However, u-boot seems to want to load at 0x108000 so it's inpractical
to generate huge image to load kernel, dtb and initramfs at correct addresses.

bootstrap debian

based on https://wiki.debian.org/InstallingDebianOn/Toshiba/AC100

dpavlin@nuc:/mnt$ sudo debootstrap --foreign --arch=armhf stretch sdd1 http://ftp.hr.debian.org/debian

dpavlin@nuc:/mnt$ df sdd1/
Filesystem     1K-blocks   Used Available Use% Mounted on
/dev/sdd1        1021948 169056    784596  18% /mnt/sdd1

dpavlin@nuc:/mnt$ sudo cp /usr/bin/qemu-arm-static sdd1/usr/bin

dpavlin@nuc:/mnt$ sudo chroot sdd1 /debootstrap/debootstrap --second-stage

dpavlin@nuc:/mnt$ cd sdd1/
dpavlin@nuc:/mnt/sdd1$ sudo mount --bind /sys sys
dpavlin@nuc:/mnt/sdd1$ sudo mount --bind /dev dev
dpavlin@nuc:/mnt/sdd1$ sudo mount --bind /proc proc
dpavlin@nuc:/mnt/sdd1$ sudo chroot .

root@nuc:/# apt-get install u-boot-tools

root@ac100:/boot# cat boot.cmd 
ext2load usb 0:1 ${kernel_addr_r} /boot/zImage
ext2load usb 0:1 ${fdt_addr_r} /boot/tegra20-paz00.dtb
ext2load usb 0:1 ${ramdisk_addr_r} /boot/uInitrd
setenv bootargs root=/dev/sda1 rootwait CMA=64M tegrapart=recovery:300:a00:800,boot:d00:1000:800,mbr:1d00:200:800
bootz ${kernel_addr_r} ${ramdisk_addr_r} ${fdt_addr_r}

# mkimage -C none -A arm -T script -d /boot/boot.cmd /boot/boot.scr

u-boot over pax, usb filesystem

dpavlin@nuc:/nuc/Tegra/ac100/create_bootimage/example$ /mnt/klin/klin/Tegra/tegrarcm/src/tegrarcm --bct paz00-micron-toshiba-8g.bct --bootloader /mnt/klin/klin/Tegra/u-boot-tegra/u-boot-dtb-tegra.bin --loadaddr 0x108000
bct file: paz00-micron-toshiba-8g.bct

Serial output:

U-Boot SPL 2018.09-rc2-38340-g3d186cf3f3 (Oct 20 2018 - 10:46:53 +0200)
Trying to boot from RAM


U-Boot 2018.09-rc2-38340-g3d186cf3f3 (Oct 20 2018 - 10:46:53 +0200)

TEGRA20
Model: Toshiba AC100 / Dynabook AZ
Board: Compal Paz00
DRAM:  512 MiB
MMC:   sdhci@c8000000: 1, sdhci@c8000600: 0
Loading Environment from MMC... OK
In:    serial
Out:   vidconsole
Err:   vidconsole
Net:   No ethernet found.
starting USB...
USB0:   USB EHCI 1.00
USB1:   No code to set up ULPI controller, please enableCONFIG_USB_ULPI and CONFIG_USB_ULPI_VIEWPORTprobe failed, error -38
USB2:   USB EHCI 1.00
scanning bus 0 for devices... 1 USB Device(s) found
scanning bus 2 for devices... 4 USB Device(s) found
       scanning usb for storage devices... 1 Storage Device(s) found
Hit any key to stop autoboot:  0
Tegra20 (Paz00) MOD # run usb_boot

wifi

root@ac100:/etc/network/interfaces.d# apt-get install firmware-ralink wpasupplicant

root@ac100:/etc/network/interfaces.d# cat wlx6c626d1788b3 
allow-hotplug wlx6c626d1788b3
iface wlx6c626d1788b3 inet dhcp
        wpa-ssid dreamhouse
        wpa-psk xxxxxxxx

disk speed

root@ac100:~# hdparm -tT /dev/sda /dev/mmcblk1

/dev/sda:
 Timing cached reads:   560 MB in  2.01 seconds = 279.14 MB/sec
 Timing buffered disk reads:  32 MB in  3.07 seconds =  10.43 MB/sec

/dev/mmcblk1:
 Timing cached reads:   598 MB in  2.00 seconds = 298.86 MB/sec
 Timing buffered disk reads: 108 MB in  3.01 seconds =  35.83 MB/sec

tuhing block size

root@ac100:/home/dpavlin/flashbench# ./flashbench -a /dev/mmcblk1 --blocksize=1024
align 2147483648        pre 727µs      on 1.07ms       post 784µs     diff 316µs
align 1073741824        pre 833µs      on 1.13ms       post 789µs     diff 320µs
align 536870912 pre 798µs      on 1.13ms       post 825µs     diff 317µs
align 268435456 pre 816µs      on 1.15ms       post 795µs     diff 342µs
align 134217728 pre 742µs      on 1.12ms       post 843µs     diff 327µs
align 67108864  pre 669µs      on 987µs       post 701µs     diff 303µs
align 33554432  pre 662µs      on 1.04ms       post 643µs     diff 385µs
align 16777216  pre 837µs      on 1.09ms       post 864µs     diff 242µs
align 8388608   pre 800µs      on 1.1ms        post 881µs     diff 262µs
align 4194304   pre 812µs      on 1.07ms       post 838µs     diff 246µs
align 2097152   pre 807µs      on 1.07ms       post 808µs     diff 258µs
align 1048576   pre 832µs      on 960µs       post 838µs     diff 125µs
align 524288    pre 833µs      on 959µs       post 838µs     diff 124µs
align 262144    pre 833µs      on 959µs       post 838µs     diff 124µs
align 131072    pre 833µs      on 962µs       post 840µs     diff 126µs
align 65536     pre 825µs      on 951µs       post 838µs     diff 120µs
align 32768     pre 826µs      on 956µs       post 825µs     diff 130µs
align 16384     pre 812µs      on 924µs       post 824µs     diff 106µs
align 8192      pre 809µs      on 841µs       post 808µs     diff 32.4µs
align 4096      pre 808µs      on 836µs       post 808µs     diff 27.7µs
align 2048      pre 808µs      on 836µs       post 809µs     diff 27.6µs

8192 seems good, re-test

root@ac100:/home/dpavlin/flashbench# ./flashbench -a /dev/mmcblk1 --blocksize=4096
align 2147483648        pre 696µs      on 1.04ms       post 725µs     diff 331µs
align 1073741824        pre 917µs      on 1.18ms       post 870µs     diff 289µs
align 536870912 pre 880µs      on 1.18ms       post 907µs     diff 291µs
align 268435456 pre 899µs      on 1.2ms        post 877µs     diff 311µs
align 134217728 pre 825µs      on 1.18ms       post 927µs     diff 300µs
align 67108864  pre 864µs      on 1.11ms       post 842µs     diff 253µs
align 33554432  pre 914µs      on 1.12ms       post 897µs     diff 212µs
align 16777216  pre 921µs      on 1.14ms       post 948µs     diff 210µs
align 8388608   pre 884µs      on 1.15ms       post 965µs     diff 229µs
align 4194304   pre 895µs      on 1.12ms       post 922µs     diff 215µs
align 2097152   pre 890µs      on 1.12ms       post 890µs     diff 227µs
align 1048576   pre 916µs      on 1.01ms       post 922µs     diff 89.7µs
align 524288    pre 916µs      on 1.01ms       post 922µs     diff 90µs
align 262144    pre 916µs      on 1.01ms       post 923µs     diff 89.1µs
align 131072    pre 916µs      on 1.01ms       post 924µs     diff 91.1µs
align 65536     pre 908µs      on 1ms  post 921µs     diff 85.9µs
align 32768     pre 911µs      on 1.01ms       post 908µs     diff 96.2µs
align 16384     pre 895µs      on 973µs       post 908µs     diff 71.4µs
align 8192      pre 892µs      on 896µs       post 892µs     diff 4.57µs

create filesystem

root@ac100:/home/dpavlin/flashbench# mkfs -t ext4 -v -b 4096 -E stride=2,stripe-width=2 /dev/mmcblk1p6 

cp -ax ....

root@ac100:~# mount /dev/mmcblk1p1 /tmp/1/
root@ac100:~# cat /tmp/1/boot/boot.cmd 
ext2load mmc 0:6 ${kernel_addr_r} /boot/zImage
ext2load mmc 0:6 ${fdt_addr_r} /boot/tegra20-paz00.dtb
ext2load mmc 0:6 ${ramdisk_addr_r} /boot/uInitrd
setenv bootargs root=/dev/mmcblk1p6 rootwait CMA=64M tegrapart=recovery:300:a00:800,boot:d00:1000:800,mbr:1d00:200:800
bootz ${kernel_addr_r} ${ramdisk_addr_r} ${fdt_addr_r}

# mkimage -C none -A arm -T script -d boot.cmd boot.scr

flash u-boot to mmc

based on https://paz00.ru/index.php?title=Flashing_Uboot_to_MMC&setlang=en

tegrarcm to get bct

dpavlin@nuc:/nuc/Tegra$ git clone https://github.com/NVIDIA/tegrarcm

dpavlin@nuc:/nuc/Tegra$ cd tegrarcm/

dpavlin@nuc:/nuc/Tegra/tegrarcm$ sudo apt-get install libcrypto++-dev

dpavlin@nuc:/nuc/Tegra/tegrarcm$ ./autogen.sh

dpavlin@nuc:/nuc/Tegra/tegrarcm$ make

dpavlin@nuc:/nuc/Tegra/tegrarcm$ ./src/tegrarcm --version
tegrarcm 1.8

create boot image

dpavlin@nuc:/nuc/Tegra/cbootimage$ git remote -v
origin  https://github.com/NVIDIA/cbootimage (fetch)
origin  https://github.com/NVIDIA/cbootimage (push)

dpavlin@nuc:/nuc/Tegra/cbootimage$ ./autogen.sh
dpavlin@nuc:/nuc/Tegra/cbootimage$ make


dpavlin@nuc:/nuc/Tegra/cbootimage$ cat > u-boot.cfg
Version       = 0x00020001;
Bctcopy       = 1;
Bctfile       = ac100.bct;
BootLoader    = u-boot.bin,0x00108000,0x00108000,Complete;


dpavlin@nuc:/nuc/Tegra/cbootimage$ cp ../ac100/create_bootimage/example/ac100-dpavlin.bct ac100.bct

dpavlin@nuc:/nuc/Tegra/cbootimage$ cp /mnt/klin/klin/Tegra/u-boot-tegra/u-boot-tegra.bin u-boot.bin

dpavlin@nuc:/nuc/Tegra/cbootimage$ ./src/cbootimage -d u-boot.cfg ac100.bct.new
bct size: 4080
**update_bl()
begin_update(): bct data: b=14 p=9
writing bootloader
  redundancy = 1
  BL[0]: 131073 0001 0000 518563 0x00108000 0x00108000
8e52c9639cb433e9e1e369cf718595c5
  BL[1]: 131073 0002 0000 302746 0x00108000 0x00108000
a9014f31e7ccafab319512de6bc48f81
**BL[2]: 0 0000 0000 0000 0x00000000 0x00000000
00000000000000000000000000000000
**BL[3]: 0 0000 0000 0000 0x00000000 0x00000000
00000000000000000000000000000000
Image file ac100.bct.new has been successfully generated!

dpavlin@nuc:/nuc/Tegra/cbootimage$ scp ac100.bct.new ac100:

dpavlin@nuc:/nuc/Tegra/cbootimage$ ssh root@ac100

# flash new boot image on ac100

root@ac100:~# echo 0 > /sys/block/mmcblk1boot0/force_ro
root@ac100:~# dd if=/home/dpavlin/ac100.bct.new of=/dev/mmcblk1boot0 
1045+0 records in
1045+0 records out
535040 bytes (535 kB, 522 KiB) copied, 0.135589 s, 3.9 MB/s
root@ac100:~# echo 1 > /sys/block/mmcblk1boot0/force_ro