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arm: imx6q: pcm058: Rework SPI NOR configuration

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Enable CONFIG_SPL_DM_SPI_FLASH to be able to boot from SPI NOR,
modify the offset of U-boot proper in the SPI NOR, so the
difference in offset matches between SPL and U-boot matches that of
the SD Card, allowing u-boot-with-spl.imx to also be copied to SPI
NOR at an offset of 0x400. Update the README to reflect this
change.

Signed-off-by: Niel Fourie <lusus@denx.de>
Cc: Stefano Babic <sbabic@denx.de>
This commit is contained in:
Niel Fourie 2020-07-24 16:33:27 +02:00 committed by Stefano Babic
parent 1e7a69f661
commit a1c6aed1de
2 changed files with 14 additions and 9 deletions
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20
board/phytec/pcm058/README
View File

@ -61,17 +61,21 @@ Then, clear the SPI flash:
=> sf probe
=> sf erase 0x0 0x1000000
Load the SPL from raw MMC into memory and copy to the SPI. The SPL is maximum
392*512-byte blocks in size therefore 0x188 blocks, totaling 0x31000 bytes:
Load the equivalent of u-boot-with-spl.imx from the raw MMC into memory and
copy to the SPI. The SPL is expected at an offset of 0x400, and its size is
maximum 392*512-byte blocks in size, therefore 0x188 blocks, totaling 0x31000
bytes. Assume U-boot should fit into 640KiB, therefore 0x500 512-byte blocks,
totalling 0xA0000 bytes. Adding these together:
=> mmc read ${loadaddr} 0x2 0x188
=> sf write ${loadaddr} 0x400 0x31000
=> mmc read ${loadaddr} 0x2 0x688
=> sf write ${loadaddr} 0x400 0xD1000
Load the U-boot binary into memory and copy to the SPI. U-boot should fit into
640KiB, so 0x500 512-byte blocks, totalling 0xA0000 bytes:
The SPL is located at offset 0x400, and U-boot at 0x31400 in SPI flash, as to
match the SD Card layout. This would allow, instead of reading from the SD Card
above, with networking and TFTP correctly configured, the equivalent of:
=> mmc read ${loadaddr} 0x18a 0x500
=> sf write ${loadaddr} 0x40000 0xA0000
=> tftp u-boot-with-spl.imx
=> sf write ${fileaddr} 0x400 ${filesize}
The default NAND bootscripts expect a single MTD partition named "rootfs",
which in turn contains the UBI volumes "fit" (which contains the kernel fit-

3
configs/pcm058_defconfig
View File

@ -7,7 +7,7 @@ CONFIG_SPL_LIBGENERIC_SUPPORT=y
CONFIG_ENV_SIZE=0x4000
CONFIG_ENV_OFFSET=0x100000
CONFIG_ENV_SECT_SIZE=0x10000
CONFIG_SYS_SPI_U_BOOT_OFFS=0x40000
CONFIG_SYS_SPI_U_BOOT_OFFS=0x31400
CONFIG_MX6_OCRAM_256KB=y
CONFIG_TARGET_PCM058=y
CONFIG_SPL_TEXT_BASE=0x00908000
@ -34,6 +34,7 @@ CONFIG_SPL_SEPARATE_BSS=y
CONFIG_SYS_MMCSD_RAW_MODE_U_BOOT_SECTOR=0x18a
CONFIG_SPL_DMA=y
CONFIG_SPL_FS_EXT4=y
CONFIG_SPL_DM_SPI_FLASH=y
CONFIG_SPL_SPI_LOAD=y
CONFIG_SPL_WATCHDOG_SUPPORT=y
CONFIG_SPL_YMODEM_SUPPORT=y