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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCH v2] xen/arm: platform: fix Raspberry Pi compatible string
On Wednesday, October 9, 2019 11:30 AM, Julien Grall <julien.grall@xxxxxxx> wrote: >On 04/10/2019 01:47, Stewart Hildebrand wrote: >> Both upstream [1] and downstream [2] Linux kernels use "brcm,bcm2711" >> as the compatible string for Raspberry Pi 4. Add this string to our >> platform compatible list. > >Did the RPI foundation released any kernel with the old binding? Sure, I see the following tags in their linux tree since initial RPi4 support until the binding was updated: raspberrypi-kernel_1.20190709-1 raspberrypi-kernel_1.20190718-1 raspberrypi-kernel_1.20190819-1 raspberrypi-kernel_1.20190925-1 These correspond with their binary releases at [3], except the binary releases also have an earlier 1.20190620+1 tag with RPi4 support. However, even with Xen looking for bcm2838, you wouldn't be able to grab one of those releases and boot without running into other issues. You'd still need a couple of additional patches at [4]. Currently the only way that I'm aware of to successfully boot into dom0 and launch domU is to build the dom0 kernel from source with the extra patches applied found at [4]. >If so, I am ok if we don't support the compatible in Xen (we don't have a >release with it yet!), but it would be worth mentioning in the commit message >that this is going to break for some users (TBD) so they need to upgrade. See below for suggestion. >@Juergen: I would like to consider this patch for Xen 4.13. This is limited to >RPI4 and would avoid us to ship it with a compatible that is going to >disappear. > >> >> The brcm,bcm2838 convention is abandoned. Remove it. >> >> Rename the variables within the file to a rpi4_* prefix since the file >> is meant to cover the Raspberry Pi 4 platform. "If you are using a device tree with the old compatible string brcm,bcm2838, you will need to upgrade your device tree to one that has the new brcm,bcm2711 compatible string." >> >> [1] https://patchwork.kernel.org/patch/11165407/ >> [2] >> https://github.com/raspberrypi/linux/commit/53fdd7b8c8cb9c87190caab4fd459f89e1b4a7f8 >> >> Signed-off-by: Stewart Hildebrand <stewart.hildebrand@xxxxxxxxxxxxxxx> [3] https://github.com/raspberrypi/firmware [4] https://github.com/dornerworks/xen-rpi4-builder/tree/master/patches/linux Stew _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxxx https://lists.xenproject.org/mailman/listinfo/xen-devel
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