Hi,
On 16/05/14 17:53, Robert Nelson wrote:
So while debugging an issue with the "flasher" script when flashing a
large number of boards. We are yanking power when all 4 led's are on.
It seems to reason, eventually the "flashing" microSD might just get
corrupt.
Did you verify that the SD power rail has a hickup during the process
when microSD gets corrupted? Or how did you end up with LEDs being
related to the issue?
I am asking this because we had on custom board a problem on GPMC NAND
access. (reading sectors gave ECC errors randomly and then retrying the
read all was fine, expect in some special cases when even that wasn't
sufficient). We had to customize read access for NAND to always use
prefetch engine (instead of odd bytes reading with direct acces,s and
then reading rest with prefetch) in order to get more stability to
access. This basically eliminated the whole issue on our boards. Signals
in normal usage seemed to be OK when measured with scope.
We did send query to TI thru hardware vendor but no response so far on
the issue...
I am just wondering if there is some unknown bug in the hardware that
could also affect microSD/eMMC side?
Thanks,
Vesa Jääskeläinen
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