Hi All,
Accord to SD spec 2.0, the formula to find out sd card capacity is:
memory capacity = (C_SIZE+1) * 512K byte
and
C_SIZE is from CSD [69:48]
Thus, the code in generic mmc is wrong for the high capacity sd card. My
patch is below.
Thanks,
victor
--- mmc.c 2012-10-09 02:20:28.000000000 +0800
+++ mmc.c.victor 2012-11-02 15:07:16.949207266 +0800
@@ -1068,17 +1104,26 @@
mmc->write_bl_len = 1 << ((cmd.response[3] >> 22) & 0xf);
if (mmc->high_capacity) {
- csize = (mmc->csd[1] & 0x3f) << 16
- | (mmc->csd[2] & 0xffff0000) >> 16;
- cmult = 8;
+ //csize = (mmc->csd[1] & 0x3f) << 16
+ // | (mmc->csd[2] & 0xffff0000) >> 16;
+ //cmult = 8;
+ csize = (mmc->csd[2] & 0x3f) << 16
+ | (mmc->csd[1] & 0xffff0000) >> 16;
} else {
csize = (mmc->csd[1] & 0x3ff) << 2
| (mmc->csd[2] & 0xc0000000) >> 30;
cmult = (mmc->csd[2] & 0x00038000) >> 15;
}
- mmc->capacity = (csize + 1) << (cmult + 2);
- mmc->capacity *= mmc->read_bl_len;
+ if (mmc->high_capacity) {
+ mmc->capacity = (csize + 1) * 512 * 1024;
+ } else {
+ mmc->capacity = (csize + 1) << (cmult + 2);
+ mmc->capacity *= mmc->read_bl_len;
+ }
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