Occasional SD command timeouts in OFW on XO-1.75
|Reported by:||wad||Owned by:||wad|
|Keywords:||XO-1.75||Cc:||wmb@…, gary@…, beckham.chen@…|
|Deployments affected:||Action Needed:||no action|
On one XO-1.75 A1 laptop (#12), running OFW Q4A05A, I have a probiem with the internal SD slot running at 50 MHz. The external slot seems to operate fine. Both slots are populated with Sandisk 4GB class 2 microSD cards.
Problems were discovered using fs-update (trying to update the internal slot), and verified using "test int". After one to five executions of "test int", OFW will start returning:
SDHCI: Error: ISR = 8000 ESR = 1 Command Timeout
Running the slot at 25 MHz, by:
dev /sd true to avoid-high-speed? dend
resulted in the slot operating fine -- an fs-update was able to complete.
First attempts to tune the timing failed, but the effects of the external RC dominate over most of the SOC timing.