On Fri, Jul 19, 2024 at 11:21:54PM +0100, Andre Przywara wrote: > Hi Tom, > Sorry for top posting, am on the road. > > First: The Allwinner drivers in U-Boot work with mainline kernel DTs for > ages, so there are no code changes required. > We manually sync the DTs from the kernel for years, but I always do one > change: > > In kernel v5.13 the Allwinner IRQ controller (not the GIC) DT binding and DTs > changed in an incompatible way, and some critical devices now route their IRQ > through that controller instead of to the GIC. If an older kernel sees such a > new DT, some critical devices fail to probe due to that, and the kernel does > not boot. Using the old DT routing fixes that, at the expense of losing some > advanced power saving features. > So in the interest of better compatibility with older kernels and > $fdtcontroladdr (default for UEFI boot), I always kept the old way during the > U-Boot sync. This affects all devices with the popular H3, A64 and H6 SoCs, > among others. A20 and older or H616s are not affected. > > So my plan was to migrate the latter group ASAP (after the v6.10 sync), and > then maybe the others in the next cycle, which means pulling the plug on > original Debian Buster kernels, for instance. 5.13 is three years old by now, > so I guess this might be fine now. > > Does that make sense?
Yes, that sounds reasonable, thanks for explaining. -- Tom
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