From patchwork Tue May 26 23:33:16 2009 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Subject: [1/3] mtd/maps: uclinux: allow systems to override map addr/size Date: Tue, 26 May 2009 13:33:16 -0000 From: Mike Frysinger X-Patchwork-Id: 27721 Message-Id: <1243380798-10089-1-git-send-email-vapier@gentoo.org> To: linux-kernel@vger.kernel.org Cc: uclinux-dist-devel@blackfin.uclinux.org, Paul Mundt , linux-mtd@lists.infradead.org, uclinux-dev@uclinux.org, Greg Ungerer 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 CC: Paul Mundt CC: Greg Ungerer CC: uclinux-dev@uclinux.org CC: linux-mtd@lists.infradead.org --- drivers/mtd/maps/uclinux.c | 10 ++++++---- 1 files changed, 6 insertions(+), 4 deletions(-) diff --git a/drivers/mtd/maps/uclinux.c b/drivers/mtd/maps/uclinux.c index 81756e3..61d4087 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",