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sh4: fix start.S by calling board_init_f() after first code relocation

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Like on ARM platform keep the first code relocation from a U-boot
image storage to RAM at CONFIG_SYS_TEXT_BASE, then pass execution to a
generic board_init_f() with empty GD flags. If CONFIG_SYS_TEXT_BASE is
equal to a calculated by board_init_f() relocation address there will
be no more code and data copy, however it's worth to mention that the
first copy happens even if $pc on _start is the same as
CONFIG_SYS_TEXT_BASE, on practice this works without a problem.

Also note that _sh_start is renamed back to _start to correct
gd->mon_len calculation by setup_mon_len(), the opposite rename was
done in pre-generic board commit 2024b968ee ("sh: Fix build in start.S").

Signed-off-by: Vladimir Zapolskiy <vz@mleia.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Vladimir Zapolskiy 2016-11-28 00:15:33 +02:00 committed by Tom Rini
parent bccf09e0e1
commit 9c141b2bd7
1 changed files with 11 additions and 12 deletions
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23
arch/sh/cpu/sh4/start.S
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@ -1,6 +1,6 @@
/*
* (C) Copyright 2007, 2010
* Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
* Copyright (C) 2016 Vladimir Zapolskiy <vz@mleia.com>
* Copyright (C) 2007, 2010 Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
*
* SPDX-License-Identifier: GPL-2.0+
*/
@ -12,7 +12,7 @@
.align 2
.global _start
_sh_start:
_start:
mov.l ._lowlevel_init, r0
100: bsrf r0
nop
@ -21,7 +21,7 @@ _sh_start:
nop
1: sts pr, r5
mov.l ._reloc_dst, r4
add #(_sh_start-1b), r5
add #(_start-1b), r5
mov.l ._reloc_dst_end, r6
2: mov.l @r5+, r1
@ -42,10 +42,9 @@ _sh_start:
mov.l ._gd_init, r13 /* global data */
mov.l ._stack_init, r15 /* stack */
#TODO(sh maintainer): Fix this up to call the correct code
#mov.l ._sh_generic_init, r0
#jsr @r0
nop
mov.l ._sh_generic_init, r0
jsr @r0
mov #0, r4
loop:
bra loop
@ -53,10 +52,10 @@ loop:
.align 2
._lowlevel_init: .long (lowlevel_init - (100b + 4))
._reloc_dst: .long reloc_dst
._reloc_dst: .long _start
._reloc_dst_end: .long reloc_dst_end
._bss_start: .long bss_start
._bss_end: .long bss_end
._gd_init: .long (_sh_start - GENERATED_GBL_DATA_SIZE)
._stack_init: .long (_sh_start - GENERATED_GBL_DATA_SIZE - CONFIG_SYS_MALLOC_LEN - 16)
#._sh_generic_init: .long sh_generic_init
._gd_init: .long (_start - GENERATED_GBL_DATA_SIZE)
._stack_init: .long (_start - GENERATED_GBL_DATA_SIZE - CONFIG_SYS_MALLOC_LEN - 16)
._sh_generic_init: .long board_init_f