Author: quozl Date: Sat Apr 27 07:47:57 2013 New Revision: 3649 URL: http://tracker.coreboot.org/trac/openfirmware/changeset/3649
Log: OLPC XO-1.5 - the Valid RAM and Time (VRT) bit in RTC register 0xd can't be trusted on the XO-1.5, so use other means to detect loss of data. This works in most cases, but there is still the possibility of data corruption when the battery is missing or discharged. #12600.
Modified: dev/ds1385r.fth
Modified: dev/ds1385r.fth ============================================================================== --- dev/ds1385r.fth Thu Apr 18 06:11:10 2013 (r3648) +++ dev/ds1385r.fth Sat Apr 27 07:47:57 2013 (r3649) @@ -88,6 +88,30 @@ cr then ; +\ : $?lost ( flag head$ -- flag ) +\ 2 pick if ." RTC amnesia - " type cr else 2drop then +\ ; +: amnesia? ( -- flag ) + 0 rtc@ h# 59 > \ " seconds" $?lost + 2 rtc@ h# 59 > \ " minutes" $?lost + or + 4 rtc@ h# 23 > \ " hours" $?lost + or + 6 rtc@ h# 10 = \ " day of week" $?lost + or + 7 rtc@ dup 0= swap h# 31 > or \ " day of month" $?lost + or + 8 rtc@ dup 0= swap h# 12 > or \ " month" $?lost + or + 9 rtc@ h# 99 > \ " year high" $?lost + or + 9 rtc@ h# 13 < \ " year low" $?lost + or + h# 1a rtc@ h# 20 <> \ " century" $?lost + or + d# 10 rtc@ h# 70 and rega-mode h# 70 and <> \ " divider" $?lost + or +; : reinit h# 20 h# 1a rtc! \ century h# 13 h# 9 rtc! \ year @@ -104,6 +128,7 @@ : open ( -- true ) my-unit 2 " map-in" $call-parent is rtc-adr first-open? if + amnesia? if reinit then rega-mode d# 10 rtc! regb-mode d# 11 rtc! \ If the battery is bad, display a message, but go open the device anyway