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authorMike Frysinger <vapier@gentoo.org>2009-05-26 19:33:16 -0400
committerDavid Woodhouse <David.Woodhouse@intel.com>2009-06-05 18:29:14 +0100
commitfa254ecbcca713a4aec99478e79f858942b3d4e0 (patch)
tree4f734d3cdb4d89987bb181e78218fb377cd12a9a /drivers/mtd/maps/uclinux.c
parentc3a9f35673290f49ec115d36ad283961c82c135a (diff)
mtd: uclinux: allow systems to override map addr/size
Due to a processor anomaly (05000263 to be exact), most Blackfin parts cannot keep the embedded filesystem image directly after the kernel in RAM. Instead, the filesystem needs to be relocated to the end of memory. As such, we need to tweak the map addr/size during boot for Blackfin systems. This can be done in any early arch/board init code. Signed-off-by: Mike Frysinger <vapier@gentoo.org> CC: Paul Mundt <lethal@linux-sh.org> CC: Greg Ungerer <gerg@uclinux.org> CC: uclinux-dev@uclinux.org CC: linux-mtd@lists.infradead.org Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com> Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Diffstat (limited to 'drivers/mtd/maps/uclinux.c')
-rw-r--r--drivers/mtd/maps/uclinux.c10
1 files changed, 6 insertions, 4 deletions
diff --git a/drivers/mtd/maps/uclinux.c b/drivers/mtd/maps/uclinux.c
index 81756e39771..61d4087dd8f 100644
--- a/drivers/mtd/maps/uclinux.c
+++ b/drivers/mtd/maps/uclinux.c
@@ -22,8 +22,12 @@
/****************************************************************************/
+extern char _ebss;
+
struct map_info uclinux_ram_map = {
.name = "RAM",
+ .phys = (unsigned long)&_ebss,
+ .size = 0,
};
struct mtd_info *uclinux_ram_mtdinfo;
@@ -55,12 +59,10 @@ static int __init uclinux_mtd_init(void)
{
struct mtd_info *mtd;
struct map_info *mapp;
- extern char _ebss;
- unsigned long addr = (unsigned long) &_ebss;
mapp = &uclinux_ram_map;
- mapp->phys = addr;
- mapp->size = PAGE_ALIGN(ntohl(*((unsigned long *)(addr + 8))));
+ if (!mapp->size)
+ mapp->size = PAGE_ALIGN(ntohl(*((unsigned long *)(mapp->phys + 8))));
mapp->bankwidth = 4;
printk("uclinux[mtd]: RAM probe address=0x%x size=0x%x\n",