powerpc: mpc85xx: Add support for generating QorIQ pre-PBL eSDHC boot sector
QorIQ U-Boot binary for SD card booting compiled during build process
(either u-boot.bin or u-boot-with-spl.bin) cannot be directly loaded by
QorIQ pre-PBL BootROM. Compiled U-Boot binary first needs to be processed
by Freescale boot_format tool as described in doc/README.mpc85xx-sd-spi-boot
BootROM requires that image on SD card must contain special boot sector.
Implement support for generating this special boot sector directly in
U-Boot start code. Boot sector needs to be at the beginning of the image,
so when compiling only proper U-Boot without SPL then it needs to be in
proper U-Boot. When compiling SPL with proper U-Boot then it needs to be
only in SPL.
Support can be enabled by a new config option FSL_PREPBL_ESDHC_BOOT_SECTOR.
Via other two additional options FSL_PREPBL_ESDHC_BOOT_SECTOR_START and
FSL_PREPBL_ESDHC_BOOT_SECTOR_DATA it is possible to tune how final U-Boot
image could be stored on the SD card.
Signed-off-by: Pali Rohár <pali@kernel.org>
diff --git a/arch/powerpc/cpu/mpc85xx/Kconfig b/arch/powerpc/cpu/mpc85xx/Kconfig
index b6881bf..12dc03c 100644
--- a/arch/powerpc/cpu/mpc85xx/Kconfig
+++ b/arch/powerpc/cpu/mpc85xx/Kconfig
@@ -12,6 +12,59 @@
This enables the 'errata' command which displays a list of errata
work-arounds which are enabled for the current board.
+config FSL_PREPBL_ESDHC_BOOT_SECTOR
+ bool "Generate QorIQ pre-PBL eSDHC boot sector"
+ depends on MPC85xx
+ depends on SYS_EXTRA_OPTIONS = SDCARD
+ help
+ With this option final image would have prepended QorIQ pre-PBL eSDHC
+ boot sector suitable for SD card images. This boot sector instruct
+ BootROM to configure L2 SRAM and eSDHC then load image from SD card
+ into L2 SRAM and finally jump to image entry point.
+
+ This is alternative to Freescale boot_format tool, but works only for
+ SD card images and only for L2 SRAM booting. U-Boot images generated
+ with this option should not passed to boot_format tool.
+
+ For other configuration like booting from eSPI or configuring SDRAM
+ please use Freescale boot_format tool without this option. See file
+ doc/README.mpc85xx-sd-spi-boot
+
+config FSL_PREPBL_ESDHC_BOOT_SECTOR_START
+ int "QorIQ pre-PBL eSDHC boot sector start offset"
+ depends on FSL_PREPBL_ESDHC_BOOT_SECTOR
+ range 0 23
+ default 0
+ help
+ QorIQ pre-PBL eSDHC boot sector may be located on one of the first
+ 24 SD card sectors. Select SD card sector on which final U-Boot
+ image (with this boot sector) would be installed.
+
+ By default first SD card sector (0) is used. But this may be changed
+ to allow installing U-Boot image on some partition (with fixed start
+ sector).
+
+ Please note that any sector on SD card prior this boot sector must
+ not contain ASCII "BOOT" bytes at sector offset 0x40.
+
+config FSL_PREPBL_ESDHC_BOOT_SECTOR_DATA
+ int "Relative data sector for QorIQ pre-PBL eSDHC boot sector"
+ depends on FSL_PREPBL_ESDHC_BOOT_SECTOR
+ default 1
+ range 1 8388607
+ help
+ Select data sector from the beginning of QorIQ pre-PBL eSDHC boot
+ sector on which would be stored raw U-Boot image.
+
+ By default is it second sector (1) which is the first available free
+ sector (on the first sector is stored boot sector). It can be any
+ sector number which offset in bytes can be expressed by 32-bit number.
+
+ In case this final U-Boot image (with this boot sector) is put on
+ the FAT32 partition into reserved boot area, this data sector needs
+ to be at least 2 (third sector) because FAT32 use second sector for
+ its data.
+
choice
prompt "Target select"
optional