From: Florian Fainelli <florian@openwrt.org>
Date: Sun, 11 Nov 2012 16:11:00 +0000 (+0000)
Subject: [ar7] free memory below kernel offset
X-Git-Url: https://git.archive.openwrt.org/?a=commitdiff_plain;h=575fa64966ab1d5f7393f2e89ce0aeba92eb139a;hp=2b4803f28c006d91bfbe1b631d2daa41ab186121;p=15.05%2Fopenwrt.git

[ar7] 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>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@34143 3c298f89-4303-0410-b956-a3cf2f4a3e73
---

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);
+ }