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Kreyren / kreyren

Personal tracking for issues that i need to resolve to be used as a reference for someone else and/or for peer-review of the solution
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Sending Serial Peripheral Interface (SPI) payload over USB on linux #71

Closed Kreyren closed 3 years ago

Kreyren commented 3 years ago

I want to be able to sent SPI payload over USB for flexibility where i expect to be able to do:

I was thinking i could get https://www.neven.cz/kategorie/elektronicke-soucastky/elektronicky-vyvoj/programatori-a-prislusenstvi-k-programovani/eeprom-flash-bios-usb-programator-s-cipem-ch341a-spi/ and do just cat file.rom > /dev/device but that is apparently not the case?

Solution: https://youtu.be/r8f-3syiFSc?t=385

Relevant

  1. Linux driver for MCP2210 https://github.com/daniel-santos/mcp2210- linux
  2. FOSDEM presentation about SPI over USB on linux https://archive.fosdem.org/2018/schedule/event/rapid_spi_over_usb/
  3. Linux driver for SPI over USB using ch341 https://github.com/gschorcht/spi-ch341-usb
  4. Linux kernel docs on SPI https://www.kernel.org/doc/html/v4.13/driver-api/spi.html
  5. Reference to use ch341a on linux for SPI https://jensd.be/980/linux/bios-or-spi-programming-on-windows-or-linux-using-a-ch341a 5.1. https://www.youtube.com/watch?v=r8f-3syiFSc&feature=emb_title
mehmetalianil commented 3 years ago

Would FTDI work? They have good driver support in UART.

Kreyren commented 3 years ago

Would FTDI work? They have good driver support in UART.

Can you eleborate how do you think it would work?

Like getting a FTDI chip that is enumerated as "something" that would allow cat file.rom > /dev/device ?

FWIW linux can do VBIOS flash using:

kreyren@system~$ echo 1 > /sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0/rom
kreyren@system~$ cat /sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0/rom > ~/rom.dump
kreyren@system~$ cat ~/file.rom > /sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0/rom
kreyren@system~$ echo 0 > /sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0/rom

Which is what i though would be possible through the USB interface as this is for a scenario where the board is not detectable in the system e.g. https://github.com/kreyware/repairs/issues/1.

Kreyren commented 3 years ago

to clarify: dependency on flashrom is acceptable (current solution using ch341a + flashrom)

Kreyren commented 3 years ago

Hm.. So was the vBIOS?

andrealmeid.com/post/2020-05-01-vbios2

andrealmeid.com/post/2020-04-10-vbios @dantecpu

The GPU is not flashable over linux (gets me adapter err)

Kreyren commented 3 years ago

What does that mean

Kreyren commented 3 years ago

I am currently satisfied with flashrom + CH341A