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[new uImage] Provide ability to restrict region used for boot images

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Allow the user to set 'bootm_low' and 'bootm_size' env vars as a way
to restrict what memory range is used for bootm.

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
Acked-by: Marian Balakowicz <m8@semihalf.com>
This commit is contained in:
Kumar Gala
2008-02-27 21:51:50 -06:00
committed by Marian Balakowicz
parent e822d7fc4d
commit d3f2fa0d27
5 changed files with 60 additions and 8 deletions
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26
lib_ppc/bootm.c
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@@ -59,6 +59,10 @@ extern ulong get_effective_memsize(void);
static ulong get_sp (void);
static void set_clocks_in_mhz (bd_t *kbd);
#ifndef CFG_LINUX_LOWMEM_MAX_SIZE
#define CFG_LINUX_LOWMEM_MAX_SIZE (768*1024*1024)
#endif
void __attribute__((noinline))
do_bootm_linux(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[],
bootm_headers_t *images)
@@ -67,6 +71,7 @@ do_bootm_linux(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[],
ulong initrd_start, initrd_end;
ulong rd_data_start, rd_data_end, rd_len;
ulong size;
ulong cmd_start, cmd_end, bootmap_base;
bd_t *kbd;
@@ -80,7 +85,24 @@ do_bootm_linux(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[],
char *of_flat_tree = NULL;
#endif
bootmap_base = 0;
bootmap_base = getenv_bootm_low();
size = getenv_bootm_size();
#ifdef DEBUG
if (((u64)bootmap_base + size) > (CFG_SDRAM_BASE + (u64)gd->ram_size))
puts("WARNING: bootm_low + bootm_size exceed total memory\n");
if ((bootmap_base + size) > get_effective_memsize())
puts("WARNING: bootm_low + bootm_size exceed eff. memory\n");
#endif
size = min(size, get_effective_memsize());
size = min(size, CFG_LINUX_LOWMEM_MAX_SIZE);
if (size < getenv_bootm_size()) {
ulong base = bootmap_base + size;
printf("WARNING: adjusting available memory to %x\n", size);
lmb_reserve(lmb, base, getenv_bootm_size() - size);
}
/*
* Booting a (Linux) kernel image
@@ -92,7 +114,7 @@ do_bootm_linux(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[],
* pointer.
*/
sp = get_sp();
debug ("## Current stack ends at 0x%08lx ", sp);
debug ("## Current stack ends at 0x%08lx\n", sp);
/* adjust sp by 1K to be safe */
sp -= 1024;