diff options
| -rw-r--r-- | src/cpu/allwinner/a10/Kconfig | 10 | ||||
| -rw-r--r-- | src/cpu/allwinner/a10/Makefile.inc | 15 |
2 files changed, 15 insertions, 10 deletions
diff --git a/src/cpu/allwinner/a10/Kconfig b/src/cpu/allwinner/a10/Kconfig index 639108a5ba..3df1cebdfc 100644 --- a/src/cpu/allwinner/a10/Kconfig +++ b/src/cpu/allwinner/a10/Kconfig @@ -42,18 +42,22 @@ config ROMSTAGE_BASE hex default SYS_SDRAM_BASE -# Keep the stack in SRAM +# Keep the stack in SRAM block A2. +# SRAM blocks A1 (0-16KiB) and A2 (16KiB-32KiB) are always accessible to the +# CPU. This gives us 32KiB of SRAM to boot with. The BROM bootloader will use up +# to 24KiB to load our bootblock, which leaves us the area from 24KiB to 32KiB +# to use however we see fit. config STACK_TOP hex default 0x00008000 config STACK_BOTTOM hex - default 0x00004000 + default 0x00006000 config STACK_SIZE hex - default 0x00004000 + default 0x00002000 ## TODO Change this to some better address not overlapping bootblock when ## cbfstool supports creating header in arbitrary location. diff --git a/src/cpu/allwinner/a10/Makefile.inc b/src/cpu/allwinner/a10/Makefile.inc index 48f3110605..9f7208ae26 100644 --- a/src/cpu/allwinner/a10/Makefile.inc +++ b/src/cpu/allwinner/a10/Makefile.inc @@ -21,15 +21,16 @@ get_bootblock_size= \ sed 's/[^0-9 ]//g')) \ $(shell echo $$(($(word 2, $(strip $(bb_s)))))) -# The boot ROM in the SoC will start loading code if a special boot0 header is +# The boot ROM in the SoC will start loading code if a special BOOT0 header is # found (at an offset of 8KiB in either NAND or SD), and the checksum is -# correct. this header is normally added by the 'mxsunxiboot' tool. The file -# passed to mksunxiboot should only include the bootblock due to size -# limitations. -# FIXME: Figure out how to safely integrate in coreboot.rom. For now, only copy -# the first 15 KiB of coreboot.rom (This will not collide with stack) +# correct. This header is normally added by the 'mxsunxiboot' tool. The boot ROM +# will load at most 24KiB of data to SRAM, so limit the file size accordingly. +# The BOOT0 header takes 32 bytes, so limit our file to 24KiB - 32 bytes. +# FIXME: Figure out how to safely integrate in coreboot.rom. +# FIXME: The file passed to mksunxiboot should only include the bootblock due +# to size limitations. $(obj)/BOOT0: $(obj)/coreboot.rom @printf " BOOT0 $(subst $(obj)/,,$(^))\n" touch $@ - dd if=$^ of=$^.tmp bs=1024 count=15 + dd if=$^ of=$^.tmp bs=24544 count=1 -mksunxiboot $^.tmp $@ |