[PATCH] arm: imx6q: pcm058: Rework SPI NOR configuration

[Niel Fourie <lusus@denx.de>]

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>
---
 board/phytec/pcm058/README | 20 ++++++++++++--------
 configs/pcm058_defconfig   |  3 ++-
 2 files changed, 14 insertions(+), 9 deletions(-)

diff --git a/board/phytec/pcm058/README b/board/phytec/pcm058/README
index 02be0994fc..687366bffb 100644
--- a/board/phytec/pcm058/README
+++ b/board/phytec/pcm058/README
@@ -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-
diff --git a/configs/pcm058_defconfig b/configs/pcm058_defconfig
index c491cbf9a0..b085a7dd0c 100644
--- a/configs/pcm058_defconfig
+++ b/configs/pcm058_defconfig
@@ -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
-- 
2.26.2