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| author | Gabriel Somlo <gsomlo@gmail.com> | 2023-03-30 16:25:30 -0400 |
|---|---|---|
| committer | Anup Patel <anup@brainfault.org> | 2023-04-07 11:16:05 +0530 |
| commit | ee016a7bb098578a5d0d4bde01259fe3cd57b02f (patch) | |
| tree | 9b0dcff8dc3146b5194d3bfd6dbc5fe5d0286c48 /docs | |
| parent | edc9914392791031df624a7c79d1706f83199666 (diff) | |
| download | opensbi-ee016a7bb098578a5d0d4bde01259fe3cd57b02f.zip opensbi-ee016a7bb098578a5d0d4bde01259fe3cd57b02f.tar.gz opensbi-ee016a7bb098578a5d0d4bde01259fe3cd57b02f.tar.bz2 | |
docs: Correct FW_JUMP_FDT_ADDR calculation example
When using `PLATFORM=generic` defaults, the kernel is loaded at
`FW_JUMP_ADDR`, and the FDT is loaded at `FW_JUMP_FDT_ADDR.
Therefore, the maximum kernel size before `FW_JUMP_FDT_ADDR` must
be increased is `$(( FW_JUMP_FDT_ADDR - FW_JUMP_ADDR ))`.
The example calculation assumes `rv64`, and is wrong to boot
(off by 0x200000). Fix it and update it for the general case.
Signed-off-by: Gabriel Somlo <gsomlo@gmail.com>
Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
Reviewed-by: Xiang W <wxjstz@126.com>
Diffstat (limited to 'docs')
| -rw-r--r-- | docs/firmware/fw_jump.md | 20 |
1 files changed, 10 insertions, 10 deletions
diff --git a/docs/firmware/fw_jump.md b/docs/firmware/fw_jump.md index 956897e..3e883fa 100644 --- a/docs/firmware/fw_jump.md +++ b/docs/firmware/fw_jump.md @@ -43,18 +43,18 @@ follows: When using the default *FW_JUMP_FDT_ADDR* with *PLATFORM=generic*, you must ensure *FW_JUMP_FDT_ADDR* is set high enough to avoid overwriting the kernel. - You can use the following method. + You can use the following method (e.g., using bash or zsh): ``` - ${CROSS_COMPILE}objdump -h $KERNEL_ELF | sort -k 5,5 | awk -n '/^ +[0-9]+ /\ - {addr="0x"$3; size="0x"$5; printf "0x""%x\n",addr+size}' \ - | (( `tail -1` > 0x2200000 )) && echo fdt overlaps kernel,\ - increase FW_JUMP_FDT_ADDR - - ${LLVM}objdump -h --show-lma $KERNEL_ELF | sort -k 5,5 | \ - awk -n '/^ +[0-9]+ / {addr="0x"$3; size="0x"$5; printf "0x""%x\n",addr+size}'\ - | (( `tail -1` > 0x2200000 )) && echo fdt overlaps kernel,\ - increase FW_JUMP_FDT_ADDR + ${CROSS_COMPILE}objdump -h $KERNEL_ELF | sort -k 5,5 | awk -n ' + /^ +[0-9]+ / {addr="0x"$3; size="0x"$5; printf "0x""%x\n",addr+size}' | + (( `tail -1` > (FW_JUMP_FDT_ADDR - FW_JUMP_ADDR) )) && + echo fdt overlaps kernel, increase FW_JUMP_FDT_ADDR + + ${LLVM}objdump -h --show-lma $KERNEL_ELF | sort -k 5,5 | awk -n ' + /^ +[0-9]+ / {addr="0x"$3; size="0x"$5; printf "0x""%x\n",addr+size}' | + (( `tail -1` > (FW_JUMP_FDT_ADDR - FW_JUMP_ADDR) )) && + echo fdt overlaps kernel, increase FW_JUMP_FDT_ADDR ``` *FW_JUMP* Example |