Hi Stephen, On Mon, Aug 24, 2009 at 10:01:16PM -0400, Stephen Caudle wrote : > I tried using your patches for the TNY-A9G20 on my QIL-A9G20 board from > Calao.
I guess you mean SBC35-A9G20? > Everything seems to work properly except the RTC. They use the same M41T94 > part and the CS is the same on both boards (PA3). I can set the RTC using the > "date" command and read back the value okay. However, when I power cycle the > board, the value is getting corrupted at startup due to some erroneous SPI > write. > > I don't believe the code you submitted is causing this problem because the RTC > is getting corrupted even if I compile out SPI and RTC support completely. I > was just wondering if you have seen this problem on your board? Yes, I also experience this issue. > I probed the > CS line with an oscilloscope and I am definitely seeing it go low on U-Boot > startup for a short time, but the clock line seems to be floating. I believe > the activation of the CS at startup is causing junk data to be written to the > RTC, which is corrupting it. Any idea why this might be happenning? Currently, I don't really have any idea. Besides, it's going to be hard for me to debug this, as I don't have an oscilloscope at hand. Would you please try to run u-boot within a debugger to see where exactly the CS line is driven low? Thanks for your feedback. Regards, -- Albin Tonnerre, Free Electrons Kernel, drivers and embedded Linux development, consulting, training and support. http://free-electrons.com
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