uclinux jedce_probe探测ID，变成flash的内容

welkinjiao 2010-6-23 08:45 楼主

Flash：两片SST39VF3201 ，一片挂CS0：地址0x80000000 一片挂CS1：地址0x81000000
使用jecdec探测

static struct map_info lpc24xx_map[2] = {
{
.name = "LPC24XX",
.bankwidth = 2,
.size = 0x400000,
.phys = 0x80000000,
},{
.name = "LPC24XX1",
.bankwidth = 2,
.size = 0x400000,
.phys = 0x81000000,
}
};
//mtd驱动
int __init lpc24xx_mtd_init(void)
{
int i;
char *part_type = NULL;
for(i=0;i<2;i++){
lpc24xx_map[i].virt = ioremap(flashphys[i], flashsize[i]);
if (!lpc24xx_map[i].virt) {
printk(KERN_ERR "LPC24XX-MTD: ioremap failed\n");
return -EIO;
}
simple_map_init(&lpc24xx_map[i]);
// Probe for flash bankwidth 4
printk (KERN_INFO "LPC24XX-MTD probing 16bit FLASH: i= %d phys=%08x\n", i, lpc24xx_map[i].phys);
mymtd[i] = do_map_probe("jedec_probe", &lpc24xx_map[i]);
printk(KERN_INFO "Chow-> end of do map probe: jedec probe\n");
/*
if (!mymtd) {
printk (KERN_INFO "LPC24XX-MTD probing 16bit FLASH\n");
// Probe for bankwidth 2
lpc24xx_map.bankwidth = 2;
mymtd = do_map_probe("cfi_probe", &lpc24xx_map);
}
*/
if (mymtd[i]) {
mymtd[i]->owner = THIS_MODULE;
#ifdef CONFIG_MTD_PARTITIONS
nr_mtd_parts[i] = parse_mtd_partitions(mymtd[i], probes, &mtd_parts[i], 0);
if (nr_mtd_parts[i] > 0)
part_type = "command line";
#endif
if (nr_mtd_parts[i] <= 0) {
if(i) {
// mtd_parts[i] = &lpc24xx_partitions1;
mtd_parts[i] = lpc24xx_partitions1;
// nr_mtd_parts = NUM_PARTITIONS;
nr_mtd_parts[i] = num_partitions[i];
part_type = "builtin";
}else{
mtd_parts[i] = lpc24xx_partitions;
// nr_mtd_parts = NUM_PARTITIONS;
nr_mtd_parts[i] = num_partitions[i];
part_type = "builtin";
}
}
}else{
iounmap((void *)lpc24xx_map[i].virt);
printk(KERN_INFO "Chow-> ENXIO\n");
//return -ENXIO;
}
}
for(i=0;i<2;i++){
printk(KERN_INFO "Using %s partition table\n", part_type);
add_mtd_partitions(mymtd[i], mtd_parts[i], nr_mtd_parts[i]);
}
// if(i) return 0;
// else continue;
return 0;
}

在启动信息中看到，能探测到第一片（0x80000000）的ID，0x235b
Search for id:(bf 235b) interleave(1) type(2)
MTD jedec_match(): Check fit 0x00000000 + 0x00400000 = 0x00400000
MTD jedec_match(): check unlock addrs 0x5555 0x2aaa
MTD jedec_match(): check ID's disappear when not in ID mode
reset unlock called 5555 2aaa
chow->base =0x0 ofs=0x2
chow->mask =0xffff resul.x[0]=0x5619
MTD jedec_match(): return to ID mode
MTD jedec_probe_chip(): matched device 0xbf,0x235b unlock_addrs: 0x5555 0x2aaa
Found: SST 39VF3201
reset unlock called 5555 2aaa
LPC24XX1: Found 1 x16 devices at 0x0 in 16-bit bank
number of JEDEC chips: 1

但是探测第2片（0x81000000）的ID时，读出的ID其实是flash存储的内容：
LPC24XX-MTD probing 16bit FLASH: i= 0 phys=81000000
reset unlock called 555 2aa
chow->base =0x0 ofs=0x2
chow->mask =0xffff resul.x[0]=0x5656
Search for id:(1212 5656) interleave(1) type(2)
12是故意写入flash的内容，第2片flash的内容是123456789123456789.。。。
reset unlock called 555 aaa
chow->base =0x0 ofs=0x2
chow->mask =0xffff resul.x[0]=0x5656
Search for id:(1212 5656) interleave(1) type(2)
reset unlock called 5555 2aaa
chow->base =0x0 ofs=0x2
chow->mask =0xffff resul.x[0]=0x5656
Search for id:(1212 5656) interleave(1) type(2)
reset unlock called aaa 555
chow->base =0x0 ofs=0x2
chow->mask =0xffff resul.x[0]=0x5656
Search for id:(1212 5656) interleave(1) type(2)
chow->base =0x0 ofs=0x2
chow->mask =0xffff resul.x[0]=0x5656
Search for id:(1212 5656) interleave(1) type(2)
chow->base =0x0 ofs=0x2

为什么读取SST芯片ID变成了读取了flash的内容？？？