On Sat, Dec 14, 2019 at 11:54:19AM +0100, H. Nikolaus Schaller wrote: > Hi Stefan, > > > Am 15.10.2019 um 19:15 schrieb Stefan Wahren <wahrenst@xxxxxxx>: > > > > Hi Florian, > > > > The following changes since commit 54ecb8f7028c5eb3d740bb82b0f1d90f2df63c5c: > > > > Linux 5.4-rc1 (2019-09-30 10:35:40 -0700) > > > > are available in the git repository at: > > > > git://github.com/anholt/linux tags/bcm2835-soc-next-2019-10-15 > > > > for you to fetch changes up to 781fa0a954240c8487683ddf837fb2c4ede8e7ca: > > > > ARM: bcm: Add support for BCM2711 SoC (2019-10-10 19:21:03 +0200) > > this patch has finally arrived in v5.5-rc1 but it seems to break > multiplatform build. > > We run a distribution kernel that supports OMAP3/4/5, i.MX6 and RasPi 3B+ > but since rebasing to v5.5-rc1 the kernel hangs after "Starting Kernel ...". > On all ARM devices (incl. RasPi 3B+). > > Playing with our defconfig did show that deconfiguring CONFIG_ARCH_BCM2835 > makes the kernel work again. > > After further analysis it turns out that reverting this patch also > makes the boards work again. > > I am not exactly sure what the reason is, but it may have something to > do with the new auto-selection of CONFIG_ZONE_DMA which is not automatically > selected by OMAP and i.MX6. > > To reproduce on some OMAP device (i.MX6 should be similar) > > 1st test: > > git checkout v5.5-rc1 > make omap2plus_defconfig > > => boots OMAP device > > 2nd test: > > ( echo CONFIG_ARCH_BCM2835=y; echo CONFIG_ARCH_BCM=y ) >>arch/arm/configs/omap2plus_defconfig > make omap2plus_defconfig > > => fails to boot OMAP device > > 3rd test: > > git revert 781fa0a954240c8487683ddf837fb2c4ede8e7ca > make omap2plus_defconfig > > => boots OMAP device > > BTW: the RasPi 3B+ runs equally well without this patch. So what is it > good for? > > So please check and fix this patch. Enabling ZONE_DMA shouldn't cause this problem - but as it does, please enable memblock debugging and early console, and please send any boot messages you can get from the system when it fails to boot. Also having a successful boot log may be useful. Thanks. -- RMK's Patch system: https://www.armlinux.org.uk/developer/patches/ FTTC broadband for 0.8mile line in suburbia: sync at 12.1Mbps down 622kbps up According to speedtest.net: 11.9Mbps down 500kbps up
