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serprog: Add support for multiple SPI chip selects

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Tested with an EliteBook 8560w, Pi Pico, and my serprog firmware:
https://codeberg.org/Riku_V/pico-serprog/

As seen on Flashprog: https://review.sourcearcade.org/c/flashprog/+/51

Change-Id: If8052bc6f5c314dcc493bc083bb8270723efaae7
Signed-off-by: Riku Viitanen <riku.viitanen@protonmail.com>
Reviewed-on: https://review.coreboot.org/c/flashrom/+/80498
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Anastasia Klimchuk <aklm@chromium.org>
This commit is contained in:
Riku Viitanen
2024-01-15 19:15:49 +02:00
committed by Anastasia Klimchuk
parent 6d128a4fff
commit e8c350f55e
3 changed files with 39 additions and 1 deletions
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4
Documentation/serprog-protocol.txt
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@ -35,6 +35,7 @@ COMMAND Description Parameters Return Value
+ slen bytes of data
0x14 Set SPI clock frequency in Hz 32-bit requested frequency ACK + 32-bit set frequency / NAK
0x15 Toggle flash chip pin drivers 8-bit (0 disable, else enable) ACK / NAK
0x16 Set SPI Chip Select 8-bit ACK / NAK
0x?? unimplemented command - invalid.
@ -89,6 +90,9 @@ Additional information of the above commands:
remain attached to the flash chip even when the board is running. The user is responsible to
NOT connect VCC and other permanently externally driven signals to the programmer as needed.
If the value is 0, then the drivers should be disabled, otherwise they should be enabled.
0x16 (S_SPI_CS):
Set which SPI Chip Select pin to use. This operation is immediate,
meaning it doesn't use the operation buffer.
About mandatory commands:
The only truly mandatory commands for any device are 0x00, 0x01, 0x02 and 0x10,
but one can't really do anything with these commands.