https://twitter.com/tnt/status/1335354626791665671

tnt @tnt

Turned my #fomu into a usb sound card with midi output and also stereo headphones out. (USB audio spec compliant so all works out of the box)

Code is now upstream :

• FOMU support in no2bootloader (alternate to foboot, better imho for single purpose projects) https://github.com/no2fpga/no2bootloader/

• USB Audio code (hw/fw) in https://github.com/smunaut/ice40-playground/tree/master/projects/usb_audio with support for fomu/icebreaker/bitsy

Ping if you want help port to other boards

Pepijn de Vos @pepijndevos

Wait how do you connect anything to the fomu? Solder wires to these capacitive tabs?

tnt @tnt

Yeah, I soldered to the 4 IOs.

• #1 is wired as a button for DFU recovery (wired to a N/C pin of DIN plug)
• #2&3 are wired as PDM audio out with RC filter & DC block cap to the 3.5mm jack
• #4 is wired as the MIDI TX pin

datasheet: dsm501.pdf

DMS501A - 2mm pin pitch, DMS501B - 2.54 mm

5V, 90mA

1 minute stabilization after power up

sum time of low (0.7v) for measurement interval, divide by time

PINOUT I/O DESCRIPTION

control pin 1

resistor between pin 1 and ground (square pin on board) to control vout 1 output (pin 4)

arduino

• Nice library, but inside repository https://github.com/richardhmm/DIYRepo/tree/master/arduino/libraries/DSM501
• interrupt driven version https://github.com/Sovichea/dsm501-interrupt/

I tried both of them and on my module they don't report sane results when compared with other sensors.

platformio

https://primalcortex.wordpress.com/2020/05/23/an-esp8266-air-quality-monitor-based-on-the-dsm501a-dust-sensor/
https://github.com/fcgdam/ESP8266_AirQuality

dpavlin@nuc:/nuc/esp8266/ESP8266_AirQuality$ git remote -v
origin  https://github.com/fcgdam/ESP8266_AirQuality (fetch)
origin  https://github.com/fcgdam/ESP8266_AirQuality (push)

# edit config
dpavlin@nuc:/nuc/esp8266/ESP8266_AirQuality$ vi src/secrets.h

dpavlin@nuc:/nuc/esp8266/ESP8266_AirQuality$ pio run

dpavlin@nuc:/nuc/esp8266/ESP8266_AirQuality$ pio run -t upload --device-port /dev/ttyUSB2

Pins:

description of similar sensor

https://github.com/opendata-stuttgart/meta/blob/master/files/ShinyeiPPD42NS_Deconstruction_TracyAllen.pdf

power supply

It really needs quiet power supply to get any readings which are not just noise.

fail2ban seems to accumulate records in sqlite database forever.

https://github.com/ffzg/fail2ban-helpers

check bans in database

dpavlin@mjesec:/var/lib/fail2ban$ ls -alh
total 165M
drwxr-xr-x  2 root root 4.0K May 12  2020 .
drwxr-xr-x 82 root root 4.0K May 12  2020 ..
-rw-------  1 root root 165M Nov 30 09:30 fail2ban.sqlite3
dpavlin@mjesec:/var/lib/fail2ban$ sqlite3 fail2ban.sqlite3
Error: unable to open database "fail2ban.sqlite3": unable to open database file
dpavlin@mjesec:/var/lib/fail2ban$ sudo sqlite3 fail2ban.sqlite3

sqlite> select datetime(min(timeofban),'unixepoch'),datetime(max(timeofban),'unixepoch') from bans ;
2020-05-12 18:25:57|2020-11-30 08:34:41

cleanup old entries

dpavlin@syslog:~$ cat /etc/cron.daily/fail2ban-sqlite
#!/bin/sh

sqlite3 /var/lib/fail2ban/fail2ban.sqlite3 "delete from bans where timeofban <= strftime('%s', date('now', '-30 days'));"
sqlite3 /var/lib/fail2ban/fail2ban.sqlite3 "vacuum;"

UART to USB 1.1 HID

I first learned about this chip from video https://youtu.be/jJoD2ioJPP0

chip on sop16 breakout

Connecting only VCC, GND USB- and USB+ to target and UART RX, TG and GND to USB serial works without any additional components.

[2022258.670458] usb 1-5.2.3: new full-speed USB device number 41 using ehci-pci
[2022258.780644] usb 1-5.2.3: New USB device found, idVendor=1a86, idProduct=e010, bcdDevice=34.00
[2022258.780657] usb 1-5.2.3: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[2022258.780663] usb 1-5.2.3: Product: HID To Serial
[2022258.780669] usb 1-5.2.3: Manufacturer: WCH.CN 4
[2022258.780674] usb 1-5.2.3: SerialNumber: 12345678
[2022258.791635] hid-generic 0003:1A86:E010.000D: hiddev3,hidraw3: USB HID v1.00 Device [WCH.CN 4 HID To Serial] on usb-0000:00:1a.7-5.2.3/input0

I does not create normal /dev/input device under Linux, but sending chars over serial at 9600 8n1 does produce output at /dev/hidraw3 device

dpavlin@x200:~$ microcom -s 9600 -p /dev/ttyUSB0

lsusb

dpavlin@x200:~$ sudo lsusb -d 1A86:E010 -v

Bus 001 Device 041: ID 1a86:e010 QinHeng Electronics
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               1.00
  bDeviceClass            0
  bDeviceSubClass         0
  bDeviceProtocol         0
  bMaxPacketSize0         8
  idVendor           0x1a86 QinHeng Electronics
  idProduct          0xe010
  bcdDevice           34.00
  iManufacturer           1 WCH.CN 4
  iProduct                2 HID To Serial
  iSerial                 3 12345678
  bNumConfigurations      1
  Configuration Descriptor:
    bLength                 9
    bDescriptorType         2
    wTotalLength       0x0029
    bNumInterfaces          1
    bConfigurationValue     1
    iConfiguration          4 (error)
    bmAttributes         0x80
      (Bus Powered)
    MaxPower              100mA
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       0
      bNumEndpoints           2
      bInterfaceClass         3 Human Interface Device
      bInterfaceSubClass      0
      bInterfaceProtocol      0
      iInterface              0
        HID Device Descriptor:
          bLength                 9
          bDescriptorType        33
          bcdHID               1.00
          bCountryCode            0 Not supported
          bNumDescriptors         1
          bDescriptorType        34 Report
          wDescriptorLength      37
         Report Descriptors:
           ** UNAVAILABLE **
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x82  EP 2 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0020  1x 32 bytes
        bInterval               1
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x02  EP 2 OUT
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0020  1x 32 bytes
        bInterval               1
can't get debug descriptor: Resource temporarily unavailable
Device Status:     0x0000
  (Bus Powered)

headless setup

dpavlin@nuc:~/Downloads$ unzip 2020-08-20-raspios-buster-armhf-lite.zip

dpavlin@nuc:~/Downloads$ dd iflag=fullblock oflag=direct conv=fsync status=progress bs=1M if=2020-08-20-raspios-buster-armhf-lite.img of=/dev/sdb

dpavlin@nuc:~/Downloads$ sudo mount /dev/sdb1 /mnt/sdb1/

# enable ssh
dpavlin@nuc:~/Downloads$ sudo touch /mnt/sdb1/ssh

# configure wifi
dpavlin@nuc:~/Downloads$ sudo cp /tmp/rpi4-backup/wpa_supplicant.conf /mnt/sdb1/

dpavlin@nuc:~/Downloads$ cat /mnt/sdb1/wpa_supplicant.conf
ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=netdev
update_config=1
country=HR

network={
	ssid="wifi_ssid"
	psk="wifi_password"
	key_mgmt=WPA-PSK
}

dpavlin@nuc:~/Downloads$ sudo umount /mnt/sdb1
dpavlin@nuc:~/Downloads$ sudo eject /dev/sdb

Board version: v7.0

• Lattice ECP5 LFE5U-25F-6BG256C (product page)
• Winbond 25Q32JVSIQ, 32 Mbits SPI flash (datasheet)
• 2x Broadcom B50612D Gigabit Ethernet PHYs (datasheet)
• 2x ESMT M12L16161A-5T 1M x 16bit 200MHz SDRAMs (organized as 1M x 32bit) (datasheet)
• 12x 74HC245T Octal Bidirectional Transceiver (used for level translation to 5V)

links

• https://hackaday.com/2020/01/24/new-part-day-led-driver-is-fpga-dev-board-in-disguise/

chubby75

• https://github.com/q3k/chubby75/tree/master/5a-75b
• upstream: https://github.com/tomverbeure/chubby75/tree/5a-75b/5a-75b
• upstream for v7 board: https://github.com/miek/chubby75/blob/5a-75b-v7_pinout/5a-75b/hardware_V7.0.md

original protocol

• send data to original fpga image: https://github.com/FalconChristmas/fpp/blob/master/src/channeloutput/ColorLight-5a-75.cpp

replace level shifters to get input

• https://twitter.com/edu_arana/status/1231466891354525698

https://twitter.com/Claude1079/status/1231194849350647808

 SN74CBT3245APW 8bit bidirectional FET switches
QS3245QG

chiselwatt

https://github.com/antonblanchard/chiselwatt/commit/5a7fcbc8142ed2b390e1f8bfaaa801fe09a60351

UART RX is on J19, labelled key+ on the silk screen on the back
UART TX is on J1, pin 1.

LOCATE COMP "clock" SITE "P6";

LOCATE COMP "io_tx" SITE "F3";
LOCATE COMP "io_rx" SITE "M13";

litex

basic example of litex on colorLight 5A-75B based on fpga_101/lab004

• https://github.com/trabucayre/litexOnColorlightLab004/
• https://github.com/NiklasFauth/colorlight-led-cube
• https://github.com/ghent360/riscvOnColorlight-5A-75B

fpga pin mapping

https://twitter.com/adamgreig/status/1297255957320421383

I don't want to load a new image onto this totally blind, so I used the prjtrellis tools (https://github.com/YosysHQ/prjtrellis/) to write a script (https://github.com/adamgreig/cl/blob/master/pins.py) which works out input/output/bidi for all pins used in any ECP5 bitstream. It found only one unused pin...

https://github.com/adamgreig/cl/blob/master/pins.py

fpga images

• https://github.com/suglover/5a-75x-images
• ecpprog (FTDI jtag probe): https://github.com/gregdavill/ecpprog

Markings on packaging:

poa5788067

skud49610

Features:

Support USB Type-C DisplayPort Alt Mode.
The standard USB-C interface supports forward and backward insertion.
Support PD charging function power up to 60W (5~20V/3A Only charging) Max.
Port use black rubber core + nickel plated shell.
Adopt standard USB-A interface.
Comply with USB3.0 standard 5Gbps transmission.
Support reading and writing data, U disk, card reader, keyboard, mouse, mobile hard disk, solid state hard disk, digital camera, etc.
USB3.0 single port output power 4.5W (5V/0.9A) supports charging devices such as mobile phones.
Supports Micro SD (T-Flash) with standard TF card slot.
Transfer data using USB3.0 standard theory: 5Gbps.
Adopt standard SD card slot
Adopt standard HDMI-mother interface
Support audio and video transmission, video support up to 4Kx2K/30Hz and backward compatible
HDMI1.4
Support analog signal video transmission, video support 1920x1080/60Hz, 1920x1080K/30Hz and backward compatible
RJ45 port adopts imported RTL8153 chip and supports 10M/100M/1000M networks transmission.
Adopt four microphone headphone jacks.
Compliance with the standard (CTIA).
Mic audio recording and playback support 48K and 44.1K sampling rate.

Specification:

Material:Aluminum alloy
Color: Silver/Gray
Applicable models:
For MacBook Pro 2017 (13"& 15")
For MacBook Pro 2016 (13"& 15")
For MacBook 2015/2016
For ChromeBook Pixel
Laptop Computers Complying with USB-C Interface
Output: Type-C
Input interface:
1*HDMI interface
1*VGA interface
3*USB 3.0 Interface
1*RJ45 interface
1*3.5mm Audio Interface
1*Memory Card Interface
1*TF Card Interface
1*Mini DP interface
Network Interface: Gigabit
Video resolution:
HDMI: 4K (3840*2160), 30Hz downward compatible
VGA: 1920*1080, 60Hz downward compatibility
Working Voltage: 5V~20V
Working temperature: 0~45°

Package included:

1 x Adapter Hub

x1 dmesg

Connected to usb-c on Thinkpad x1

[330796.938562] usb 4-1.2: Failed to set U1 timeout to 0x0,error code -19
[330796.945207] usb 4-1.2: Set SEL for device-initiated U1 failed.
[330796.953401] usb 4-1.2: Set SEL for device-initiated U2 failed.
[330796.953405] usb 4-1.2: usb_reset_and_verify_device Failed to disable LPM
[330800.072541] usb usb4-port1: Cannot enable. Maybe the USB cable is bad?
[330800.072572] usb 4-1: USB disconnect, device number 2
[330800.072578] usb 4-1.2: USB disconnect, device number 3
[330800.074002] usb 4-1.3: USB disconnect, device number 4
[330800.074185] cdc_ether 4-1.3:2.0 enx0050b6b7e85b: unregister 'cdc_ether' usb-0000:3b:00.0-1.3, CDC Ethernet Device
[330800.109311] usb 4-1.4: USB disconnect, device number 5
[330820.716417] usb 1-3: new full-speed USB device number 10 using xhci_hcd
[330820.879114] usb 1-3: New USB device found, idVendor=177a, idProduct=963d, bcdDevice= 1.00
[330820.879125] usb 1-3: New USB device strings: Mfr=2, Product=3, SerialNumber=1
[330820.879130] usb 1-3: Product: Billboard Device
[330820.879135] usb 1-3: Manufacturer: EXPSM USB
[330820.879138] usb 1-3: SerialNumber: 0001
[330820.889606] hid-generic 0003:177A:963D.0003: hiddev0,hidraw0: USB HID v1.10 Device [EXPSM USB Billboard Device] on usb-0000:00:14.0-3/input0
[330822.128370] usb 1-3: USB disconnect, device number 10
[330824.552424] xhci_hcd 0000:3b:00.0: Timeout while waiting for setup device command
[330824.760580] usb 4-1: new SuperSpeed Gen 1 USB device number 6 using xhci_hcd
[330824.800393] usb 1-3: new high-speed USB device number 11 using xhci_hcd
[330824.888497] usb 4-1: new SuperSpeed Gen 1 USB device number 6 using xhci_hcd
[330824.972239] usb 1-3: New USB device found, idVendor=05e3, idProduct=0610, bcdDevice= 6.54
[330824.972246] usb 1-3: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[330824.972249] usb 1-3: Product: USB2.1 Hub
[330824.972251] usb 1-3: Manufacturer: GenesysLogic
[330824.975342] hub 1-3:1.0: USB hub found
[330824.979079] hub 1-3:1.0: 4 ports detected
[330825.233338] usb 4-1: new SuperSpeed Gen 1 USB device number 7 using xhci_hcd
[330825.255826] usb 4-1: New USB device found, idVendor=05e3, idProduct=0626, bcdDevice= 6.54
[330825.255837] usb 4-1: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[330825.255842] usb 4-1: Product: USB3.1 Hub
[330825.255846] usb 4-1: Manufacturer: GenesysLogic
[330825.257766] hub 4-1:1.0: USB hub found
[330825.258065] hub 4-1:1.0: 4 ports detected
[330825.312494] usb 1-3.3: new high-speed USB device number 12 using xhci_hcd
[330825.437770] usb 1-3.3: New USB device found, idVendor=05e3, idProduct=0618, bcdDevice=87.53
[330825.437780] usb 1-3.3: New USB device strings: Mfr=0, Product=1, SerialNumber=0
[330825.437785] usb 1-3.3: Product: USB2.0 Hub
[330825.439067] hub 1-3.3:1.0: USB hub found
[330825.439379] hub 1-3.3:1.0: 4 ports detected
[330825.544465] usb 4-1.4: new SuperSpeed Gen 1 USB device number 8 using xhci_hcd
[330825.565383] usb 4-1.4: New USB device found, idVendor=0bda, idProduct=8153, bcdDevice=30.00
[330825.565394] usb 4-1.4: New USB device strings: Mfr=1, Product=2, SerialNumber=6
[330825.565399] usb 4-1.4: Product: USB 10/100/1000 LAN
[330825.565403] usb 4-1.4: Manufacturer: Realtek
[330825.565406] usb 4-1.4: SerialNumber: 000001
[330825.608359] usbcore: registered new interface driver r8152
[330825.688848] usb 4-1.4: reset SuperSpeed Gen 1 USB device number 8 using xhci_hcd
[330825.728420] usb 1-3.3.1: new high-speed USB device number 13 using xhci_hcd
[330825.740964] r8152 4-1.4:1.0 eth0: v1.09.9
[330825.791038] r8152 4-1.4:1.0 enx00e04c6800e9: renamed from eth0
[330825.841409] usb 1-3.3.1: New USB device found, idVendor=05e3, idProduct=0752, bcdDevice= 2.33
[330825.841412] usb 1-3.3.1: New USB device strings: Mfr=3, Product=4, SerialNumber=0
[330825.841414] usb 1-3.3.1: Product: USB Storage
[330825.841415] usb 1-3.3.1: Manufacturer: Generic
[330825.843667] usb-storage 1-3.3.1:1.0: USB Mass Storage device detected
[330825.843985] scsi host1: usb-storage 1-3.3.1:1.0
[330826.857820] scsi 1:0:0:0: Direct-Access     Generic  STORAGE DEVICE   0233 PQ: 0 ANSI: 0
[330826.858611] sd 1:0:0:0: Attached scsi generic sg1 type 0
[330826.860029] sd 1:0:0:0: [sdb] Attached SCSI removable disk
[330839.531138] usb 1-3: USB disconnect, device number 11
[330839.531149] usb 1-3.3: USB disconnect, device number 12
[330839.531154] usb 1-3.3.1: USB disconnect, device number 13
[330840.284381] usb 4-1: USB disconnect, device number 7
[330840.284392] usb 4-1.4: USB disconnect, device number 8

x230 dmesg

Connected using usb-c to usb 3 adapter (no video adapter if not connected using usb-c?)

[Sat Aug 29 13:14:26 2020] xhci_hcd 0000:00:14.0: Timeout while waiting for setup device command
[Sat Aug 29 13:14:32 2020] xhci_hcd 0000:00:14.0: Timeout while waiting for setup device command
[Sat Aug 29 13:14:32 2020] usb 3-2.4: device not accepting address 6, error -62
[Sat Aug 29 13:14:32 2020] usb 2-2.4: new high-speed USB device number 10 using xhci_hcd
[Sat Aug 29 13:14:32 2020] usb 2-2.4: New USB device found, idVendor=05e3, idProduct=0610, bcdDevice= 6.54
[Sat Aug 29 13:14:32 2020] usb 2-2.4: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[Sat Aug 29 13:14:32 2020] usb 2-2.4: Product: USB2.1 Hub
[Sat Aug 29 13:14:32 2020] usb 2-2.4: Manufacturer: GenesysLogic
[Sat Aug 29 13:14:32 2020] hub 2-2.4:1.0: USB hub found
[Sat Aug 29 13:14:32 2020] hub 2-2.4:1.0: 4 ports detected
[Sat Aug 29 13:14:32 2020] usb 3-2.4: new SuperSpeed Gen 1 USB device number 7 using xhci_hcd
[Sat Aug 29 13:14:33 2020] usb 3-2.4: New USB device found, idVendor=05e3, idProduct=0626, bcdDevice= 6.54
[Sat Aug 29 13:14:33 2020] usb 3-2.4: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[Sat Aug 29 13:14:33 2020] usb 3-2.4: Product: USB3.1 Hub
[Sat Aug 29 13:14:33 2020] usb 3-2.4: Manufacturer: GenesysLogic
[Sat Aug 29 13:14:33 2020] hub 3-2.4:1.0: USB hub found
[Sat Aug 29 13:14:33 2020] hub 3-2.4:1.0: 4 ports detected
[Sat Aug 29 13:14:33 2020] usb 2-2.4.3: new high-speed USB device number 11 using xhci_hcd
[Sat Aug 29 13:14:33 2020] usb 2-2.4.3: New USB device found, idVendor=05e3, idProduct=0618, bcdDevice=87.53
[Sat Aug 29 13:14:33 2020] usb 2-2.4.3: New USB device strings: Mfr=0, Product=1, SerialNumber=0
[Sat Aug 29 13:14:33 2020] usb 2-2.4.3: Product: USB2.0 Hub
[Sat Aug 29 13:14:33 2020] hub 2-2.4.3:1.0: USB hub found
[Sat Aug 29 13:14:33 2020] hub 2-2.4.3:1.0: 4 ports detected
[Sat Aug 29 13:14:33 2020] usb 3-2.4.4: new SuperSpeed Gen 1 USB device number 8 using xhci_hcd
[Sat Aug 29 13:14:33 2020] usb 3-2.4.4: New USB device found, idVendor=0bda, idProduct=8153, bcdDevice=30.00
[Sat Aug 29 13:14:33 2020] usb 3-2.4.4: New USB device strings: Mfr=1, Product=2, SerialNumber=6
[Sat Aug 29 13:14:33 2020] usb 3-2.4.4: Product: USB 10/100/1000 LAN
[Sat Aug 29 13:14:33 2020] usb 3-2.4.4: Manufacturer: Realtek
[Sat Aug 29 13:14:33 2020] usb 3-2.4.4: SerialNumber: 000001
[Sat Aug 29 13:14:33 2020] usb 3-2.4.4: reset SuperSpeed Gen 1 USB device number 8 using xhci_hcd
[Sat Aug 29 13:14:33 2020] r8152 3-2.4.4:1.0: firmware: failed to load rtl_nic/rtl8153a-4.fw (-2)
[Sat Aug 29 13:14:33 2020] r8152 3-2.4.4:1.0: Direct firmware load for rtl_nic/rtl8153a-4.fw failed with error -2
[Sat Aug 29 13:14:33 2020] r8152 3-2.4.4:1.0: unable to load firmware patch rtl_nic/rtl8153a-4.fw (-2)
[Sat Aug 29 13:14:33 2020] r8152 3-2.4.4:1.0 eth0: v1.11.11
[Sat Aug 29 13:14:33 2020] r8152 3-2.4.4:1.0 enx00e04c6800e9: renamed from eth0
[Sat Aug 29 13:14:33 2020] usb 2-2.4.3.1: new high-speed USB device number 12 using xhci_hcd
[Sat Aug 29 13:14:33 2020] usb 2-2.4.3.1: New USB device found, idVendor=05e3, idProduct=0752, bcdDevice= 2.33
[Sat Aug 29 13:14:33 2020] usb 2-2.4.3.1: New USB device strings: Mfr=3, Product=4, SerialNumber=0
[Sat Aug 29 13:14:33 2020] usb 2-2.4.3.1: Product: USB Storage
[Sat Aug 29 13:14:33 2020] usb 2-2.4.3.1: Manufacturer: Generic
[Sat Aug 29 13:14:33 2020] usb-storage 2-2.4.3.1:1.0: USB Mass Storage device detected
[Sat Aug 29 13:14:33 2020] scsi host6: usb-storage 2-2.4.3.1:1.0
[Sat Aug 29 13:14:34 2020] scsi 6:0:0:0: Direct-Access     Generic  STORAGE DEVICE   0233 PQ: 0 ANSI: 0
[Sat Aug 29 13:14:34 2020] sd 6:0:0:0: Attached scsi generic sg2 type 0
[Sat Aug 29 13:14:34 2020] sd 6:0:0:0: [sdc] Attached SCSI removable disk

firmware for network card

root@x230:/home/dpavlin# apt install firmware-realtek

dpavlin@x230:/lib/firmware$ ls -al rtl_nic/rtl8153a-4.fw
ls: cannot access 'rtl_nic/rtl8153a-4.fw': No such file or directory

sigh, if package is too old here is work-around: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=962972

Spin-off from Chromebook papge to document running mainline u-boot and Linux on Exynos

u-boot

SPI eeprom image

dpavlin@klin:/klin/u-boot$ cat build-spi.sh 
#!/bin/sh -xe

make
#cp /klin/books/Chromebook/spi/snow-bricked.rom .
cp snow-bricked.rom snow-mix.rom
dd conv=notrunc if=spl/smdk5250-spl.bin of=snow-mix.rom seek=$((0x00002000)) bs=1
dd conv=notrunc if=u-boot.bin of=snow-mix.rom seek=$((0x00006000)) bs=1
scp snow-mix.rom rpi2:chromebook/

Upstream u-boot works, but can't find mmc devices, so internal flash is not accessable, so I had to boot from USB network using u-boot pxe

chromiumos build

dpavlin@klin:/klin/chromebook$ . env.sh 
dpavlin@klin:/klin/chromebook/chromiumos$ cros_sdk

• apply some patches (or not) as described at

(cr) (altAddr) dpavlin@klin ~/trunk/src/third_party/u-boot/files $ emerge-${BOARD} chromeos-u-boot

pxelinux config

dpavlin@x230:/var/tftp/pxelinux.cfg$ cat default-arm-exynos 
TIMEOUT 10

MENU TITLE TFTP boot

LABEL snow
        MENU LABEL sdcard?
        LINUX ../zImage
        FDTDIR ../
        APPEND console=tty1 console=ttyS0,115200n8 loglevel=8 rootwait rw earlyprintk root=/dev/sdcard0

kernel

doesn't boot ATM

dpavlin@klin:/klin/imx6/linux-imx$ cat build-chromebook.sh 
# 

cd /klin/chromebook/chromiumos/src/third_party/kernel/v4.4

export CROSS_COMPILE="arm-linux-gnueabihf-" ARCH=arm

test ! -f .config && make exynos_defconfig
make -j4 zImage exynos5250-snow.dtb
cp -v arch/arm/boot/zImage arch/arm/boot/dts/exynos5250-snow.dtb /media/boot/

chromiumos kernel

https://github.com/dnschneid/crouton/wiki/Build-chrome-os-kernel-and-kernel-modules

security

(might not be related, but useful to keep track of)

• https://fredericb.info/2020/06/exynos8890-bootrom-dump-dump-exynos-8890-bootrom-from-samsung-galaxy-s7.html
• https://fredericb.info/2020/06/reverse-engineer-usb-stack-of-exynos-bootrom.html
• https://github.com/frederic/exynos8890-bootrom-dump