grub2: fix initrd size restriction bug

The current grub2 fails on loading large initrd file (> 500M) since
the initrd size is added to the addr_min and causes the failure.
Fix it by picking a patch from grub2 upstream.

(From OE-Core rev: 156d8fecf31a7a9dc257e55e25645c561d5ba0b8)

Signed-off-by: Shan Hai <shan.hai@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-bsp/grub/files/grub2-fix-initrd-size-bug.patch

@@ -0,0 +1,48 @@
+From 8fbb150a56966edde4dc07b8d01be5eb149b65ab Mon Sep 17 00:00:00 2001
+From: Colin Watson <cjwatson@ubuntu.com>
+Date: Sun, 20 Jan 2013 23:03:35 +0000
+Subject: [PATCH 1/1] * grub-core/loader/i386/linux.c (grub_cmd_initrd): Don't
+ add the initrd size to addr_min, since the initrd will be allocated after
+ this address.
+
+commit 6a0debbd9167e8f79cdef5497a73d23e580c0cd4 upstream
+
+Upstream-Status: Backport
+
+Signed-off-by: Shan Hai <shan.hai@windriver.com>
+---
+ ChangeLog                     | 6 ++++++
+ grub-core/loader/i386/linux.c | 3 +--
+ 2 files changed, 7 insertions(+), 2 deletions(-)
+
+diff --git a/ChangeLog b/ChangeLog
+index c2f42d5..40cb508 100644
+--- a/ChangeLog
++++ b/ChangeLog
+@@ -1,3 +1,9 @@
++2013-01-20  Colin Watson  <cjwatson@ubuntu.com>
++
++	* grub-core/loader/i386/linux.c (grub_cmd_initrd): Don't add the
++	initrd size to addr_min, since the initrd will be allocated after
++	this address.
++
+ 2012-07-02  Vladimir Serbinenko  <phcoder@gmail.com>
+ 
+ 	* grub-core/net/tftp.c (ack): Fix endianness problem.
+diff --git a/grub-core/loader/i386/linux.c b/grub-core/loader/i386/linux.c
+index 62087cf..e2425c8 100644
+--- a/grub-core/loader/i386/linux.c
++++ b/grub-core/loader/i386/linux.c
+@@ -1098,8 +1098,7 @@ grub_cmd_initrd (grub_command_t cmd __attribute__ ((unused)),
+      worse than that of Linux 2.3.xx, so avoid the last 64kb.  */
+   addr_max -= 0x10000;
+ 
+-  addr_min = (grub_addr_t) prot_mode_target + prot_init_space
+-             + page_align (size);
++  addr_min = (grub_addr_t) prot_mode_target + prot_init_space;
+ 
+   /* Put the initrd as high as possible, 4KiB aligned.  */
+   addr = (addr_max - size) & ~0xFFF;
+-- 
+1.8.5.2.233.g932f7e4
+

meta/recipes-bsp/grub/grub2.inc

@@ -26,6 +26,7 @@ SRC_URI = "ftp://ftp.gnu.org/gnu/grub/grub-${PV}.tar.gz \
            file://grub-efi-fix-with-glibc-2.20.patch \
            file://0001-Unset-need_charset_alias-when-building-for-musl.patch \
            file://0001-parse_dhcp_vendor-Add-missing-const-qualifiers.patch \
+           file://grub2-fix-initrd-size-bug.patch \
             "
 
 DEPENDS = "flex-native bison-native xz"