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[new uImage] ppc: Allow boards to specify effective amount of memory

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For historical reasons we limited the stack to 256M because some boards
could only map that much via BATS.  However newer boards are capable of
mapping more memory (for example 85xx is capable of doing up to 2G).

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
Acked-by: Marian Balakowicz <m8@semihalf.com>
This commit is contained in:
Kumar Gala 2008-02-19 22:03:47 -06:00 • committed by Marian Balakowicz
parent 274cea2bdd
commit 4648c2e7a1
1 changed files with 15 additions and 7 deletions
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22
lib_ppc/board.c
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@ -361,6 +361,20 @@ init_fnc_t *init_sequence[] = {
NULL, /* Terminate this list */
};
#ifndef CONFIG_MAX_MEM_MAPPED
#define CONFIG_MAX_MEM_MAPPED (256 << 20)
#endif
ulong get_effective_memsize(void)
{
#ifndef CONFIG_VERY_BIG_RAM
return gd->ram_size;
#else
/* limit stack to what we can reasonable map */
return ((gd->ram_size > CONFIG_MAX_MEM_MAPPED) ?
CONFIG_MAX_MEM_MAPPED : gd->ram_size);
#endif
}
/************************************************************************
*
* This is the first part of the initialization sequence that is
@ -419,13 +433,7 @@ void board_init_f (ulong bootflag)
*/
len = (ulong)&_end - CFG_MONITOR_BASE;
#ifndef CONFIG_VERY_BIG_RAM
addr = CFG_SDRAM_BASE + gd->ram_size;
#else
/* only allow stack below 256M */
addr = CFG_SDRAM_BASE +
(gd->ram_size > 256 << 20) ? 256 << 20 : gd->ram_size;
#endif
addr = CFG_SDRAM_BASE + get_effective_memsize();
#ifdef CONFIG_LOGBUFFER
/* reserve kernel log buffer */