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I'm not from Technologic but it does appear that you have a kernel source difference problem. I'd start with the latest Technologic distribution
ftp://ftp.embeddedarm.com/ts-arm-sbc/ts-7800-linux/distributions/ then re-add your mods. Slow but sure From: osogoet <> To: Sent: Friday, August 26, 2011 9:03 AM Subject: [ts-7000] Re: TS-7800, Cannot access the Hardware Clock via any known method. Yes, it is an option, and I bought 8 TS-7800s with OP-BBRTC.
Please check the invoice #50491. Also, the RTC works fine when booting from NAND Flash. Well, I had compiled kernel of PC Linux many times, although I have not been doing so for these a few(or several) years. Then, if possible I will self-compile the 2.6.34 kernel on TS-7800, running Linux 2.6.34. And would you suggest where I do download source tree from? BTW, the reason why I use kernel 2.6.34 (and GCC 4.3.2) is that accessing PC-104 via mmap() requires EABI based on GCC 4.3.2 which runs on kernel 2.6.34. --- In , Walter Marvin <> wrote: > > I checked and a RTC is optional on the TS-7800 (e.g. you have to buy it extra) Check you original invoice and see if you have one installed > > > > ________________________________ > From: osogoet <> > To: > Sent: Thursday, August 25, 2011 10:24 AM > Subject: [ts-7000] Re: TS-7800, Cannot access the Hardware Clock via any known method. > > > Â > > I downloaded 7800_avr_reflash.tar.gz, and following the README, execute ./refresh script. > However, kernel 2.6.34 could still not find the RTC. > > I got the file system of 2.6.34 somewhere. It was only a few months ago, but I can't remember where I got the image from, or what did I do to setup micorSD. > > Well, should I make/compile the 2.6.34 kernel from sources? > But, I am not so smart to do so. > > So, I would like to reflash the AVR on 7800 with the older image, unless the bug in > the older AVR image is serious. > > Would you supply the older 7800_avr flash image? > > Regards, > > --- In , Mark Featherston <mark@> wrote: > > > > Is this a new TS-7800, or did you recently update the AVR following the > > errata here? > > http://www.embeddedarm.com/about/resource.php?item=563 > > > > Walter is correct that it is optional, so make sure you ordered with > > OP-BBRTC. However there was a recently discovered bug with the 2.6.34 > > kernel and the latest FPGA revision. From > > /arch/arm/mach-orion5x/ts78xx-setup.c: > > > > static void ts78xx_fpga_supports(void) > > { > > /* TODO: put this 'table' into ts78xx-fpga.h */ > > switch (ts78xx_fpga.id) { > > case TS7800_REV_1: > > case TS7800_REV_2: > > case TS7800_REV_3: > > case TS7800_REV_4: > > case TS7800_REV_5: > > case TS7800_REV_9: > > ts78xx_fpga.supports.ts_rtc.present = 1; > > ts78xx_fpga.supports.ts_nand.present = 1; > > ts78xx_fpga.supports.ts_rng.present = 1; > > > > break; > > default: > > ts78xx_fpga.supports.ts_rtc.present = 0; > > ts78xx_fpga.supports.ts_nand.present = 0; > > ts78xx_fpga.supports.ts_rng.present = 0; > > > > } > > } > > > > If you have a new board, or applied the AVR update, you will be running > > revision 10. As you can see there, it will assume there is no RTC, > > NAND, or RNG. We only officially support the 2.6.21 kernel, but a > > simple change would be to make the defaults assume presence of the RTC > > when it doesn't recognize the revision. Once it is working you can just > > use hwclock to interface with the RTC. > > > > Keep in mind this board does have support in the vanilla kernels from > > kernel.org. A fix was already submitted: > > https://lkml.org/lkml/2011/3/4/223 > > > > Best Regards, > > __________________________________________________________ > > Mark Featherston, Technologic Systems | voice: (480) 837-5200 > > 16525 East Laser Drive | fax: (480) 837-5300 > > Fountain Hills, AZ 85268 | web: www.embeddedARM.com > > > > On 08/24/2011 04:11 PM, Walter Marvin wrote: > > > First check you have a RTC. on the 7500 it is optional. > > > > > > ---------------------------------------------------------- > > > *From:* osogoet <mah01422@> > > > *To:* > > > *Sent:* Wednesday, August 24, 2011 1:23 PM > > > *Subject:* [ts-7000] TS-7800, Cannot access the Hardware Clock via any > > > known method. > > > > > > I have been running kernel 2.6.34 from microSD on TS-7800, and > > > everything goes well. > > > However, recently I encounter the problem of RTC. > > > > > > While, it's OK for TS-7800 board with 'BOOTROM - built Jun 10 2009', > > > the RTC of TS-7800 board with 'BOOTROM - built May 11 2011' is not > > > recognized. > > > > > > The related boot message is: > > > > > > Setting the system clock. > > > Cannot access the Hardware Clock via any known method. > > > Use the --debug option to see the details of our search for an access > > > method. > > > Unable to set System Clock to: Thu Jan 1 00:00:12 UTC 1970 (warning). > > > > > > and the results of 'hwclock' and 'hwclock --debug' are: > > > > > > ts7800:~# hwclock > > > Cannot access the Hardware Clock via any known method. > > > Use the --debug option to see the details of our search for an access > > > method. > > > > > > ts7800:~# hwclock --debug > > > hwclock from util-linux-ng 2.13.1.1 > > > hwclock: Open of /dev/rtc failed, errno=2: No such file or directory. > > > No usable clock interface found. > > > Cannot access the Hardware Clock via any known method. > > > > > > Also, there are /dev/rtc and /dev/rtc0 on TS-7800 board with 'BOOTROM - > > > built Jun 10 2009', > > > there is neither /dev/rtc nor /dev/rtc0 on TS-7800 board with 'BOOTROM - > > > built May 11 2011'. > > > > > > How could it be fixed? > > > > > > > > > > > > > > > __._,_.___
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