[openfirmware] [commit] r2065 - dev/mmc/sdhci
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svn at openfirmware.info
Fri Dec 3 08:10:10 CET 2010
Author: quozl
Date: Fri Dec 3 08:10:10 2010
New Revision: 2065
URL: http://tracker.coreboot.org/trac/openfirmware/changeset/2065
Log:
OLPC XO-1.5 - increase external SD card power-up off time for a 32 G class 10 SD card being tested.
Modified:
dev/mmc/sdhci/sdhci.fth
Modified: dev/mmc/sdhci/sdhci.fth
==============================================================================
--- dev/mmc/sdhci/sdhci.fth Fri Dec 3 07:55:12 2010 (r2064)
+++ dev/mmc/sdhci/sdhci.fth Fri Dec 3 08:10:10 2010 (r2065)
@@ -801,10 +801,16 @@
false to writing?
;
+\ time to hold card power off to allow VCC_SD to discharge
+\ 25ms required for XO-1.5 with external SanDisk 32 G class 10 SD card
+\ 29ms required for XO-1.5 with external SanDisk 8 G class 4 SD card
+\ 1ms should be required for XO-1.75 A2 (due to discharge clamps)
+d# 40 value power-off-time
+
\ -1 means error, 1 means retry
: power-up-card ( -- false | retry? true )
intstat-on
- card-power-off d# 20 ms
+ card-power-off power-off-time ms
card-power-on d# 40 ms \ This delay is just a guess (20 was barely too slow for a Via board)
card-inserted? 0= if card-power-off intstat-off false true exit then
card-clock-slow d# 10 ms \ This delay is just a guess
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