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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