arm: mvebu: Add option to use UART xmodem protocol via kwboot
This patch enables the use of the kwboot tool, to boot mainline U-Boot
on the Marvell Armada XP/38x SoC's. This is done by returning to the
SoC's BootROM after SPL has initialized the SDRAM. We need to make sure
to not reconfigure the internal register space and MBARs. Otherwise
the BootROM will not be able to continue after SPL jumps back to it.
To use this feature, please don't forget to change the BOOT_FROM line
in your board specfic kwbimage.cfg file this way:
BOOT_FROM uart
Tested on these Marvell eval boards:
DB-MV784MP-GP - Armada XP
DB-88F6820-GP - Armada 38x
Signed-off-by: Stefan Roese <sr@denx.de>
Cc: Dirk Eibach <eibach@gdsys.de>
Cc: Kevin Smith <kevin.smith@elecsyscorp.com>
Cc: Luka Perkov <luka.perkov@sartura.hr>
diff --git a/Makefile b/Makefile
index fd06024..3b2eebf 100644
--- a/Makefile
+++ b/Makefile
@@ -901,7 +901,7 @@
-T kwbimage -a $(CONFIG_SYS_TEXT_BASE) -e $(CONFIG_SYS_TEXT_BASE)
MKIMAGEFLAGS_u-boot-spl.kwb = -n $(srctree)/$(CONFIG_SYS_KWD_CONFIG:"%"=%) \
- -T kwbimage -a $(CONFIG_SPL_TEXT_BASE) -e $(CONFIG_SPL_TEXT_BASE)
+ -T kwbimage -a $(CONFIG_SYS_TEXT_BASE) -e $(CONFIG_SYS_TEXT_BASE)
MKIMAGEFLAGS_u-boot.pbl = -n $(srctree)/$(CONFIG_SYS_FSL_PBL_RCW:"%"=%) \
-R $(srctree)/$(CONFIG_SYS_FSL_PBL_PBI:"%"=%) -T pblimage
@@ -909,8 +909,18 @@
u-boot.img u-boot.kwb u-boot.pbl: u-boot.bin FORCE
$(call if_changed,mkimage)
+# If the kwboot xmodem protocol is used, to boot U-Boot on the MVEBU
+# SoC's, the SPL U-Boot returns to the BootROM after it completes
+# the SDRAM setup. The BootROM expects no U-Boot header in the main
+# U-Boot image. So we need to combine SPL and u-boot.bin instead of
+# u-boot.img in this case.
+ifdef CONFIG_MVEBU_BOOTROM_UARTBOOT
+u-boot-spl.kwb: u-boot.bin spl/u-boot-spl.bin FORCE
+ $(call if_changed,mkimage)
+else
u-boot-spl.kwb: u-boot.img spl/u-boot-spl.bin FORCE
$(call if_changed,mkimage)
+endif
MKIMAGEFLAGS_u-boot-dtb.img = $(MKIMAGEFLAGS_u-boot.img)