Hi, On Wed, Apr 24, 2019 at 07:29:29PM +0000, Paul Burton wrote: > On Wed, Apr 24, 2019 at 09:20:12PM +0300, Aaro Koskinen wrote: > > I have been trying to get GCC bootstrap to pass on CI20 board, but it > > seems to always crash. Today, I finally got around connecting the serial > > console to see why, and it logged the below BUG. > > > > I wonder if this is an actual bug, or is the hardware faulty? > > > > FWIW, this is 32-bit board with 1 GB RAM. The rootfs is on MMC, as well > > as 2 GB + 2 GB swap files. > > > > Kernel config is at the end of the mail. > > I'd bet on memory corruption, though not necessarily faulty hardware. > > Unfortunately memory corruption on Ci20 boards isn't uncommon... Someone > did make some tweaks to memory timings configured in the DDR controller > which improved things for them a while ago: > > https://github.com/MIPS/CI20_u-boot/pull/18 > > Would you be up for testing with those tweaks? I'd be happy to help with > updating U-Boot if needed. Thanks, I wasn't aware of this, and seems like it could help. I guess instructions here <https://elinux.org/CI20_Dev_Zone> are valid, i.e. I can use MMC/SD card to re-flash the U-boot without the risk of bricking the board, if I understood correctly? BTW, would it be possible to re-adjust these timings from the kernel side? > Do you know which board revision you have? (Is it square or a funny > shape, green or purple, and does it have a revision number printed on > the silkscreen?) It's a purple one. Based on quick look all printings are identical to this one: https://images.anandtech.com/doci/8958/purple%20ci20_smaller_678x452.jpg A.
