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/u-boot-spl.lds b/arch/powerpc/cpu/mpc85xx/u-boot-spl.lds
index 62c3c51..e881537 100644
--- a/arch/powerpc/cpu/mpc85xx/u-boot-spl.lds
+++ b/arch/powerpc/cpu/mpc85xx/u-boot-spl.lds
@@ -12,6 +12,14 @@
SECTIONS
{
+/* Optional boot sector */
+#if defined(CONFIG_FSL_PREPBL_ESDHC_BOOT_SECTOR)
+ .bootsect IMAGE_TEXT_BASE - CONFIG_FSL_PREPBL_ESDHC_BOOT_SECTOR_DATA * 512 : {
+ KEEP(*(.bootsect))
+ . = CONFIG_FSL_PREPBL_ESDHC_BOOT_SECTOR_DATA * 512;
+ }
+#endif
+
. = IMAGE_TEXT_BASE;
.text : {
/* For ifc, elbc, esdhc, espi, all need the SPL without section .resetvec */