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Add CONFIG_SYS_SYM_OFFSETS to support offset symbols

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Link symbols as created by the link script can either be absolute or
relative to the text start. This option switches between the two options
so that we can support both.

As we convert architectures over to generic board, we can see if this
option is actually needed, or whether it is possible to unify this feature
also.

Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass 2013-03-11 07:06:48 +00:00 committed by Tom Rini
parent 959daa21d4
commit 632efa7440
2 changed files with 21 additions and 0 deletions
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7
README
View File

@ -3222,6 +3222,13 @@ Configuration Settings:
its config.mk file). If you find problems enabling this option on
your board please report the problem and send patches!
- CONFIG_SYS_SYM_OFFSETS
This is set by architectures that use offsets for link symbols
instead of absolute values. So bss_start is obtained using an
offset _bss_start_ofs from CONFIG_SYS_TEXT_BASE, rather than
directly. You should not need to touch this setting.
The following definitions that deal with the placement and management
of environment data (variable area); in general, we support the
following configurations:

14
common/board_f.c
View File

@ -107,8 +107,13 @@ static int display_text_info(void)
{
ulong bss_start, bss_end;
#ifdef CONFIG_SYS_SYM_OFFSETS
bss_start = _bss_start_ofs + _TEXT_BASE;
bss_end = _bss_end_ofs + _TEXT_BASE;
#else
bss_start = (ulong)&__bss_start;
bss_end = (ulong)&__bss_end;
#endif
debug("U-Boot code: %08X -> %08lX BSS: -> %08lX\n",
CONFIG_SYS_TEXT_BASE, bss_start, bss_end);
@ -174,7 +179,11 @@ static int zero_global_data(void)
static int setup_mon_len(void)
{
#ifdef CONFIG_SYS_SYM_OFFSETS
gd->mon_len = _bss_end_ofs;
#else
gd->mon_len = (ulong)&__bss_end - (ulong)&__text_start;
#endif
return 0;
}
@ -190,7 +199,11 @@ static int setup_fdt(void)
gd->fdt_blob = _binary_dt_dtb_start;
#elif defined CONFIG_OF_SEPARATE
/* FDT is at end of image */
# ifdef CONFIG_SYS_SYM_OFFSETS
gd->fdt_blob = (void *)(_end_ofs + CONFIG_SYS_TEXT_BASE);
# else
gd->fdt_blob = (ulong *)&_end;
# endif
#endif
/* Allow the early environment to override the fdt address */
gd->fdt_blob = (void *)getenv_ulong("fdtcontroladdr", 16,
@ -483,6 +496,7 @@ static int mark_bootstage(void)
}
static init_fnc_t init_sequence_f[] = {
zero_global_data,
setup_fdt,
setup_mon_len,
arch_cpu_init, /* basic arch cpu dependent setup */