On Wed, Dec 16, 2020 at 4:15 PM Matthias Brugger <matthias....@gmail.com> wrote: > > Hi Dave, > > On 16/12/2020 15:23, Dave Jones wrote: > > Hi, > > > > We've recently run across some failures with U-Boot on a couple of > > platforms, > > specifically the relatively new Pi Compute Module 4, and the Pi 4 8GB of > > RAM. On > > the CM4, U-Boot failed to identify the eMMC storage, and on the Pi 4 8GB, a > > crash and reset occurred when U-Boot tried to read from the boot > > file-system on > > the SD card, but only when booted with no monitor attached (attaching a > > monitor > > results in a successful boot, at least under arm64). These were with > > more-or-less stock rpi_4_defconfig and rpi_4_32b_defconfig configurations > > from > > v2020.10 (our local config changes bump the env-size, enable OF_BOARD, and > > RAW_INITRD, but that's it). > > > > I've bisected the source and figured out roughly the commits responsible; > > for > > the CM4 eMMC case it's the enabling of DMA for the SDHCI interface in > > c6b9fbf756. > > > > The Pi 4 8GB failure was a little more complex in that the bisection > > pointed to > > 3113c84ba2 (a merge), however that gave me a few clues to try and after a > > little > > experimenting I found that disabling CONFIG_PCI_BRCMSTB (effectively > > disabling > > the PCI driver for the platform) got things working happily again. > > > > I'm happy to submit the local patches I'm adding to the Ubuntu build to work > > around these, but obviously those fixes are "brute force and ignorance" > > patches > > that just disable the relevant config; would such patches be wanted, or > > would > > the community prefer to figure out the root causes in each case? I'm happy > > to > > test any patches on the relevant hardware if anyone doesn't have access to > > the > > necessary boards. > > > > Thanks for looking into this. I'm aware of problems booting CM4 and RPi 400 > with > PCI. I wasn't aware that RPi4 8GB problem was related to PCI as well. Would > you > mind to test this series, if this fixes your problems: > https://patchwork.ozlabs.org/user/todo/uboot/?series=220661
That's your todo list so the link doesn't work for an anonymous consumer.
