We are currently trying to boot from an external SPI Flash memory on a custom board.
This memory is connected to Tegra K1 through SPI4 with the correct Chip Select (CS0).
The boot_sel straps are configured as “1000” : SPI BOOT.
We know the JTK1 has a w25q32dw chip which seems to be fine to boot from.
It seems that the BootROM can’t read back what is written in it.
We are using an AT45DB081E part :
>>> Verifying image in RAM... crc32 for 801bd000 ... 802389ff ==> 25f8ae68 >>> Selecting SPI device... SF: Detected AT45DB081D with page size 256 Bytes, erase size 64 KiB, total 1 MiB >>> Erasing SPI... SF: 1048576 bytes @ 0x0 Erased: OK >>> Writing image back to SPI... device 0 offset 0x0, size 0x7ba00 SF: 506368 bytes @ 0x0 Written: OK >>> Reading image back from SPI... device 0 offset 0x0, size 0x7ba00 SF: 506368 bytes @ 0x0 Read: OK >>> Verifying image from flash... crc32 for c0000000 ... c007b9ff ==> ffce05a9 CRC MISMATCH of readback image
Even if NVIDIA doesn’t officially support SPI Boot, could someone confirm that the BootRom SPI controller needs a JEDEC read ID compliance ?
ie the SPI flash has to be one of those :
Thanks in advance