Hello,
I'm working on a modular socfpga based system with several optional boards. Each optional board contain a board ID that can be read through a SPI bus.
Since we want just read the board ID, we used manually the sspi command, something like:
=> sspi 1:1.0 8 0 42
But it seems that the sspi command can't be used in a uboot script. sspi seems only used to manually test spi drivers.
If we compare with i2c command, we have a i2c read to memory:
i2c read chip address[.0, .1, .2] length memaddress - read to memory
Why there is no such feature for spi ? Is there an interest to evolve the sspi command to add a read to memory?
sspi <bus id>: <chip select>.<mode> <bit length> <data> <memaddress>
By looking at existing code, it seems that hardware detection in uboot is handled by architecture/board specific code to set custom environment variable like "fpgatype" [1] or "unit_ident" "unit_serial" [2] (misc_init_r).
What do you recommend? Implement a custom misc_init_r() for hardware detection?
[1] https://gitlab.denx.de/u-boot/u-boot/blob/master/arch/arm/mach-socfpga/misc_... [2] https://gitlab.denx.de/u-boot/u-boot/blob/master/board/softing/vining_fpga/s...
Best regards, Romain