From: Florian Fainelli <florian@openwrt.org>
Date: Sun, 11 Nov 2012 16:11:00 +0000 (+0000)
Subject: free memory below kernel offset
X-Git-Tag: reboot~12354
X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=d9b89db3801e9750592c6fc617847528ff3ad34b;p=openwrt%2Fstaging%2Fxback.git

free memory below kernel offset

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
---

diff --git a/target/linux/ar7/patches-3.3/200-free-mem-below-kernel-offset.patch b/target/linux/ar7/patches-3.3/200-free-mem-below-kernel-offset.patch
new file mode 100644
index 0000000000..399822a1ca
--- /dev/null
+++ b/target/linux/ar7/patches-3.3/200-free-mem-below-kernel-offset.patch
@@ -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);
+ }