Hi Archit, On 20.12.2011 16:23, Archit Taneja wrote: >>> [ 0.238494] Kernel BUG at c0033e34 [verbose debug info unavailable] >>> [ 0.245025] Internal error: Oops - undefined instruction: 0 [#1] SMP >>> [ 0.262390] PC is at omap3_l3_app_irq+0x108/0x12c >> >> I'm getting the same error on one of my AM3517 boards. >> L3_SI_FLAG_STATUS_0 register has bit 15 set that means Display SS IA >> burst >> timeout according to the RM. >> >> Regards, Ilya. > > Do the bootloaders on these boards enable display? Yes, U-Boot on the problematic board enables the display. Disabling display support in U-Boot makes this problem go away. > There was a patch which got into the kernel in 3.2-rc4: > > b923d40dd4211c4ef7d4efa2bd81b7ca1d8744c1 > ARM: OMAP2PLUS: DSS: Ensure DSS works correctly if display is enabled in > bootloader > > This tries to disable any display outputs if enabled in bootloader. If > this issue didn't happen before, we might want to look into this code. Hm. I can't say reverting this patch solves the problem completely. It seems to me that the bug triggers more rarely without this patch but I can't say for sure: it might be just a coincedence. > Could you share what debug prints you get from the function > omap_dss_reset() (its in arch/arm/mach-omap2/display.c) I can't see much debug output from this function/file. The only line is dss_core: softreset done and it's the same regardless of the bug was triggered or not. Do you wish me to add some debugging output and present the results? It would be great if you could say what data to dump. Regards, Ilya. -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
