Hi, Thomas A's advice works on my RPi 4B and is prerequisite for using the Workstation 32 edition on it. Here is my cookbook:
https://dl.fedoraproject.org/pub/fedora-secondary/development/32/Workstation/aarch64/images/ xzcat ./ | sudo dd status=progress bs=1M of=/dev/sdx && sync EFI/fedora/grub.cfg EFI/fedora/grubenv cma=256M@704M I end up with an apparenlty fully functional Fedora and after deactivation of animation effects using Tweaks, Gnome is not (very) sluggish and works fine for me. Cheers, Thomas B On Thu, Apr 23, 2020 at 5:46 PM Thomas H.P. Andersen <[email protected]> wrote: > Hi, > > I have looked into the CMA setting issue a bit. This is what I have found > so far. > > The rpi4 needs CMA to be in ZONE_DMA (lower 1GB of memory) as this is the > only area that the peripherals on the rpi4 can address. > > The DT sets the allowed range to allocate the CMA from ( > arch/arm/boot/dts/bcm2711.dtsi#L869 > <https://github.com/torvalds/linux/blob/master/arch/arm/boot/dts/bcm2711.dtsi#L869>), > but it seems to not work here. What does work is instead to set the offset > manually. I replaced "cma=256MB" with "cma=256M@704M" and then it boots. > Note that it has to be 256M instead of 256MB. > > Removing the cma option on the command line was known as a workaround. > Without that we would fall back to the build config of 64MB cma which was > located at offset 0x38000000. This left 64MB at the end of ZONE_DMA, and I > chose offset 704M so that those 64MB would still be free. Not sure if that > is needed or not. The crashkernel needs to be in ZONE_DMA as well but it > seems to be set to 0 size. > > I have tested on 5.7 rc2 from rawhide. > > This probably belongs in a bug report. What would be the correct place to > file that? From what I can tell upstream has been tested with cma settings > without problems (as long as the requested CMA size can fit in ZONE_DMA). > From that it seems like fedora-specific issue. Not sure though. > > Cheers, > Thomas > _______________________________________________ > arm mailing list -- [email protected] > To unsubscribe send an email to [email protected] > Fedora Code of Conduct: > https://docs.fedoraproject.org/en-US/project/code-of-conduct/ > List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines > List Archives: > https://lists.fedoraproject.org/archives/list/[email protected] >
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