On Thu, 7 Aug 2008 12:16:19 +0800
"maowy" <maowy@xxxxxxxxxxx> wrote:
> borasah____________
> I have the same problem with you when using nandflash.
> Our kernel can recognize nandflash but it seems to be all bad block.
> How dou you successfully solve this problem of nandflash .
> Can you tell how to solve this problem.
> Hope to receive your letter as soon as possible.Thanks.
>
>
> our platform:AU1550
> OS:linux-2.6.13
Please give the "gen_nand" driver a try. I ran into identical problems
on Au1200; the in-kernel au1550nd.c code seems to be explicitly
tailored for small-page nands on the PB1550/DB1200 boards and doesn't
seem to work anywhere else.
FWIW, here's a snippet I use on Au1200 which you can paste into your
board setup code; it should work on Au1550 too since the NAND parts are
identical.
---------- 8< --------------------- 8< -----------------
#include <linux/mtd/mtd.h>
#include <linux/mtd/map.h>
#include <linux/mtd/nand.h>
#include <linux/mtd/partitions.h>
#include <asm/mach-au1x00/au1000.h>
static void au1200_nand_cmd_ctrl(struct mtd_info *mtd, int cmd,
unsigned int ctrl)
{
struct nand_chip *this = mtd->priv;
unsigned long ioaddr = (unsigned long)this->IO_ADDR_W;
ioaddr &= 0xffffff00;
if (ctrl & NAND_CLE) {
ioaddr += MEM_STNAND_CMD;
} else if (ctrl & NAND_ALE) {
ioaddr += MEM_STNAND_ADDR;
} else {
/* assume we want to r/w real data by default */
ioaddr += MEM_STNAND_DATA;
}
this->IO_ADDR_R = this->IO_ADDR_W = (void __iomem *)ioaddr;
if (cmd != NAND_CMD_NONE) {
au_writeb(cmd, ioaddr);
au_sync();
}
}
static int au1200_nand_device_ready(struct mtd_info *mtd)
{
int ret = (au_readl(MEM_STSTAT) & 1);
au_sync();
return ret;
}
static const char *au1200_part_probes[] = { "cmdlinepart", NULL };
static struct mtd_partition au1200_nand_parts[] = {
[0] = {
.name = "NAND FS 0",
.offset = 0,
.size = MTDPART_SIZ_FULL,
},
};
struct platform_nand_data au1200_nand_platdata = {
.chip = {
.nr_chips = 1,
.chip_offset = 0,
.nr_partitions = ARRAY_SIZE(au1200_nand_parts),
.partitions = au1200_nand_parts,
.chip_delay = 20,
.part_probe_types = au1200_part_probes,
},
.ctrl = {
.hwcontrol = 0,
.dev_ready = au1200_nand_device_ready,
.select_chip = 0,
.cmd_ctrl = au1200_nand_cmd_ctrl,
},
};
static struct resource au1200_nand_res[] = {
[0] = {
.start = 0x20000000,
.end = 0x200000ff,
.flags = IORESOURCE_MEM,
},
};
static struct platform_device au1200_nand_dev = {
.name = "gen_nand",
.num_resources = ARRAY_SIZE(au1200_nand_res),
.resource = au1200_nand_res,
.id = -1,
.dev = {
.platform_data = &au1200_nand_platdata,
}
};
---------- 8< --------------------- 8< -----------------
Best regards,
Manuel Lauss
