Hi Elad, I'm forwarding your bug report to the linux-mmc@ list.
- Chris.
I've been working on a bringup of an new board in Harmonic Inc.
This board uses Sandisk iNand eMMC flash.
I've noticed that the mmc driver keeps detecting 1 bit width although HW
supports 4 bit, looked into it, and found the problem. In line 571 at mmc.c:
There is:
/* only compare read only fields */
err = !((card->ext_csd.raw_partition_support ==
bw_ext_csd[EXT_CSD_PARTITION_SUPPORT]) &&
(card->ext_csd.raw_erased_mem_count ==
bw_ext_csd[EXT_CSD_ERASED_MEM_CONT]) &&
(card->ext_csd.rev ==
bw_ext_csd[EXT_CSD_REV]) &&
(card->ext_csd.raw_ext_csd_structure ==
...
The problem is that raw_partition_support is not the same when setting width of
4 bits instead of 1 bit, and shouldn't be compared at all although it is read
only.
this should be changed to:
/* only compare read only fields */
err = !((card->ext_csd.raw_erased_mem_count ==
bw_ext_csd[EXT_CSD_ERASED_MEM_CONT]) &&
(card->ext_csd.rev ==
bw_ext_csd[EXT_CSD_REV]) &&
(card->ext_csd.raw_ext_csd_structure ==
...
--
Chris Ball <cjb@xxxxxxxxxx> <http://printf.net/>
One Laptop Per Child
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