I'm using the freebios v1 tree on a geode gx1/cs5530a/w83977 with 2.6.11. I noticed that there appears to be problem with writing to the RTC using hwclock. I seem to be able to use hwclock to set the time but not the date. That is:
# date Wed Mar 30 09:16:11 IST 2005 # hwclock Mon Jan 10 08:56:16 2005 0.000000 seconds # hwclock -w # hwclock Tue Jan 11 09:16:21 2005 0.000000 seconds
I noticed that the date went to Jan 11 while the time was updated correctly. When I switch back to the vendor BIOS, this issue goes away. I'm not yet sure what to suspect. I'll go look at the kernel's rtc code for writing to the CMOS since it would appear that it can set the time but not the date for some reason. If anyone has any suggestions, please let me know.
Thanks.
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On Tue, Mar 29, 2005 at 07:28:00PM -0800, ramesh bios wrote:
I'm using the freebios v1 tree on a geode gx1/cs5530a/w83977 with 2.6.11. I noticed that there appears to be problem with writing to the RTC using hwclock. I seem to be able to use hwclock to set the time but not the date. That is:
There are a few bits in the 5530 at page 107 in the data sheet regarding the RTC, but I doubt the RTC would be reachable at all if they weren't ok.
I just went over the RTC part of the W83977F data sheet too and it seems to have a couple of control bits that may have to be tweaked to get proper operation. I don't remember if anyone else has had similar problems with that superio.
Besides timing, the only other explanation I can think of is that since time is stored in RTC registers 00h, 02h and 04h, date of month in 07h and month/year in 08h-09h, if address bit 3 wasn't connected properly then the date registers would be unreachable, but then you should see some connection between time and date, so lack of proper initialization or possibly a timing issue is my guess..
//Peter
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Peter Stuge -
ramesh bios