Hi, On 14/03/18 22:06, Martin Lucina wrote: > On Wednesday, 14.03.2018 at 16:09, Martin Lucina wrote: >> On Wednesday, 14.03.2018 at 15:51, Martin Lucina wrote: >>> I've now done a full cross debootstrap on the host to work around the >>> kernel BUG, adding the kernel modules from 4.16-rc5 manually to the rootfs. >>> Interestingly, U-boot or the kernel don't seem to see the ethernet device >>> at all. Also, the ATF is complaining about setting up the PMIC which may be >>> related? >> >> ... this appears to be random: on a cold boot I now get a "NOTICE: PMIC: >> setup successful", however "modprobe dwmac-sun8i" still gets me no network >> interface. > > And a further data point: I've taken the SD card containing kernel > 4.16-rc5, stretch rootfs used in my tests so far, replaced U-boot 2018.03 > and the dtb with the Pine64+ versions and successfully booted on a PINE > A64-LTS board a friend lent me. There are no instances of the "BUG: bad > page state in process ..." and I also see the Ethernet device in U-boot and > the kernel. > > In summary the above plus my testing so far with two separate Olimex > A64-oLinuXino boards points to the Olimex board support and/or hardware > in general being the cause of the problem.
So that might be a DRAM issue then. Can you try to lower the frequency? Just set CONFIG_DRAM_CLK in your U-Boot .config (or _defconfig) to 648 for a start, or try lower values in 24MHz steps. The default value for A64 boards is 672 MHz. And somewhat related: Can you please check the actual DRAM chips? Find the actual name on them (and add them to the linux-sunxi wiki [1] on the way), ideally also find a data sheet? The DRAM setup code in U-Boot assumes certain chips, also has some assumptions about PCB specific values, so the board might need more adjustment here. Cheers, Andre. [1] http://linux-sunxi.org/Olimex_A64-OLinuXino -- You received this message because you are subscribed to the Google Groups "linux-sunxi" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
