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free memory below kernel offset

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Some bootloaders (e.g. PSPBoot on AC49x) have a load-offset, this frees that
memory region so it is usable for Linux.

Signed-off-by: Daniel Golle <dgolle@allnet.de>
Signed-off-by: Florian Fainelli <florian@openwrt.org>

SVN-Revision: 34143
This commit is contained in:
Florian Fainelli 2012-11-11 16:11:00 +00:00
parent 76553002d9
commit d9b89db380
1 changed files with 15 additions and 0 deletions
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15
target/linux/ar7/patches-3.3/200-free-mem-below-kernel-offset.patch Normal file
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@ -0,0 +1,15 @@
--- a/arch/mips/ar7/memory.c
+++ b/arch/mips/ar7/memory.c
@@ -67,5 +67,11 @@ void __init prom_meminit(void)
void __init prom_free_prom_memory(void)
{
- /* Nothing to free */
+ /* adapted from arch/mips/txx9/generic/setup.c */
+ unsigned long saddr = PHYS_OFFSET + PAGE_SIZE;
+ unsigned long eaddr = __pa_symbol(&_text);
+
+ /* free memory between prom-record and kernel _text base */
+ if (saddr < eaddr)
+ free_init_pages("prom memory", saddr, eaddr);
}