Dobrica Pavlinušić's random unstructured stuff
Toshiba AC100: Revision 41
Compal_LA-6352P_PAZ00_AC100.pdf
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.
In theory. In practice driver package from
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
links
fetchrss: http://feeds.delicious.com/v2/rss/dpavlin/ac100?count=15
- There was an error: 500 Can't connect to feeds.delicious.com:80 (Bad hostname 'feeds.delicious.com')
phh 2.6.32 kernel with working suspend and audio
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
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
