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sh: Fix OF_SEPARATE support

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If the OF_SEPARATE is enabled, the DT is appended past the _end symbol.
The current code however clears BSS very early, which overwrites the DT
blob with zeroes. Moreover, the early code relocates U-Boot into RAM to
the correct location, but does not relocate the DT.

This patch adds code to relocate the DT and avoids clearing BSS too
early, thus addressing both problems with OF_SEPARATE on SH.

Signed-off-by: Marek Vasut <marek.vasut+renesas@gmail.com>
Cc: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
This commit is contained in:
Marek Vasut 2019-09-01 18:05:03 +02:00 committed by Marek Vasut
parent 6756762024
commit ee3a4a708a
2 changed files with 15 additions and 0 deletions
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1
arch/sh/cpu/u-boot.lds
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@ -75,6 +75,7 @@ SECTIONS
PROVIDE (__init_end = .);
PROVIDE (reloc_dst_end = .);
PROVIDE (_end = .);
PROVIDE (bss_start = .);
PROVIDE (__bss_start = .);

14
arch/sh/lib/start.S
View File

@ -22,6 +22,17 @@ _start:
mov.l ._reloc_dst, r4
add #(_start-1b), r5
mov.l ._reloc_dst_end, r6
#ifdef CONFIG_OF_SEPARATE
mov.l ._reloc_size, r0
add r5, r0
add #4, r0
mov.l @r0, r0
swap.b r0, r0
swap.w r0, r0
swap.b r0, r0
add #4, r0
add r0, r6
#endif
2: mov.l @r5+, r1
mov.l r1, @r4
@ -29,6 +40,7 @@ _start:
cmp/hs r6, r4
bf 2b
#ifndef CONFIG_OF_SEPARATE
mov.l ._bss_start, r4
mov.l ._bss_end, r5
mov #0, r1
@ -37,6 +49,7 @@ _start:
add #4, r4
cmp/hs r5, r4
bf 3b
#endif
mov.l ._gd_init, r13 /* global data */
mov.l ._stack_init, r15 /* stack */
@ -53,6 +66,7 @@ loop:
._lowlevel_init: .long (lowlevel_init - (100b + 4))
._reloc_dst: .long _start
._reloc_dst_end: .long reloc_dst_end
._reloc_size: .long (_end - _start)
._bss_start: .long bss_start
._bss_end: .long bss_end
._gd_init: .long (_start - GENERATED_GBL_DATA_SIZE)