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Blackfin: override default uClinux MTD addr/size

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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.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
This commit is contained in:
Mike Frysinger 2009-05-26 23:34:51 +00:00
parent 37082511f0
commit 79df1b6947
1 changed files with 7 additions and 4 deletions
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11
arch/blackfin/kernel/setup.c
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@ -18,9 +18,12 @@
#include <linux/tty.h>
#include <linux/pfn.h>
#ifdef CONFIG_MTD_UCLINUX
#include <linux/mtd/map.h>
#include <linux/ext2_fs.h>
#include <linux/cramfs_fs.h>
#include <linux/romfs_fs.h>
#endif
#include <asm/cplb.h>
#include <asm/cacheflush.h>
@ -45,6 +48,7 @@ EXPORT_SYMBOL(_ramend);
EXPORT_SYMBOL(reserved_mem_dcache_on);
#ifdef CONFIG_MTD_UCLINUX
extern struct map_info uclinux_ram_map;
unsigned long memory_mtd_end, memory_mtd_start, mtd_size;
unsigned long _ebss;
EXPORT_SYMBOL(memory_mtd_end);
@ -535,10 +539,9 @@ static __init void memory_setup(void)
}
/* Relocate MTD image to the top of memory after the uncached memory area */
dma_memcpy((char *)memory_end, _end, mtd_size);
memory_mtd_start = memory_end;
_ebss = memory_mtd_start; /* define _ebss for compatible */
uclinux_ram_map.phys = memory_mtd_start = memory_end;
uclinux_ram_map.size = mtd_size;
dma_memcpy((void *)uclinux_ram_map.phys, _end, uclinux_ram_map.size);
#endif /* CONFIG_MTD_UCLINUX */
#if (defined(CONFIG_BFIN_ICACHE) && ANOMALY_05000263)