On 07/11/2018 05:11 AM, Jason Rush wrote: [...] >>>>> However, if I press the HPS_RST push button on the SoCKit (which is >>>>> connected >>>>> to power on reset), occasionally U-Boot will lock up while booting. It >>>>> always >>>>> boots and operates correctly from the initial power on, but it almost >>>>> always >>>>> fails to boot after pressing the HPS_RST button. >>>>> >>>>> Usually after pressing the HPS_RST button, U-Boot makes it past the SPL, >>>>> and >>>>> hangs somewhere after the call to setup_reloc() in ./common/board_f.c. >>>>> Once >>>>> it hangs there, pressing the HPS_RST button again usually causes the SPL >>>>> to >>>>> hang while setting up the MMU (before my call to memset). Eventually the >>>>> WDT kicks in, and it just keeps hanging up in the same place. Once it >>>>> gets in >>>>> this mode, the only way to recover it is by toggling power on the board. >>>>> >>>>> I spent a bunch of time today trying to track down where it was hanging, >>>>> but >>>>> I couldn't pin point anything. The MMU tables looked correct. The MMU >>>>> registers looked good. I'm not sure the best way to debug what's going >>>>> on. >>>> Try triggering warm reset and cold reset via the reset register: >>>> >>>> mw 0xffd05004 1 >>>> mw 0xffd05004 2 >>>> >>>> Does it hang in one case and not in the other ? >>>> >>> It hangs in both cases. >>> >>> I did find that if I do not metset the last 1MiB of DRAM with the cache on, >>> both warm and cold resets work. >>> >>> I changed the ecc scrubbing to zero out the first 0x8000 bytes and the last >>> 0x10000 bytes before the MMU is setup and I enable dcache. Then with >>> the dcache enabled, I zero out the rest of memory. The resets work in this >>> case as well. So there seems to be some side effect of clearing out the >>> relocate address space with the cache on. >> Can you investigate ? >> > I'd be happy to investigate more, but I'm not really sure what > my next step should be. > > Something appears to be happening differently when U-Boot > relocates if the dcache is on. But don't know how to track it > down.
IIRC I disabled cache after scrubbing. > I was thinking I might dump the DRAM where U-Boot relocates > to both with the dcache on and off, and see if there are any > differences. I'm not really sure what that tells me though if I > find a difference. > > Any suggestions? > > Regards, > Jason > -- Best regards, Marek Vasut _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de https://lists.denx.de/listinfo/u-boot
