arm: imx6q: pcm058: Rework SPI NOR configuration
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>
diff --git a/board/phytec/pcm058/README b/board/phytec/pcm058/README
index 02be099..687366b 100644
--- a/board/phytec/pcm058/README
+++ b/board/phytec/pcm058/README
@@ -61,17 +61,21 @@
=> 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-