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 2024b968ee9 ("sh: Fix build in start.S").
Signed-off-by: Vladimir Zapolskiy vz@mleia.com --- arch/sh/cpu/sh4/start.S | 23 +++++++++++------------ 1 file changed, 11 insertions(+), 12 deletions(-)
diff --git a/arch/sh/cpu/sh4/start.S b/arch/sh/cpu/sh4/start.S index 77fc221..416adcf 100644 --- a/arch/sh/cpu/sh4/start.S +++ b/arch/sh/cpu/sh4/start.S @@ -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