On 2/18/20 10:40 AM, Rob Herring wrote: > On Tue, Feb 18, 2020 at 12:14 PM Andre Przywara <andre.przywara@xxxxxxx> wrote: >> >> On Tue, 18 Feb 2020 11:13:10 -0600 >> Rob Herring <robh@xxxxxxxxxx> wrote: >> >> Hi, >> >>> Calxeda has been defunct for 6 years now. Use of Calxeda servers carried >>> on for some time afterwards primarily as distro builders for 32-bit ARM. >>> AFAIK, those systems have been retired in favor of 32-bit VMs on 64-bit >>> hosts. >>> >>> The other use of Calxeda Midway I'm aware of was testing 32-bit ARM KVM >>> support as there are few or no other systems with enough RAM and LPAE. Now >>> 32-bit KVM host support is getting removed[1]. >>> >>> While it's not much maintenance to support, I don't care to convert the >>> Calxeda DT bindings to schema nor fix any resulting errors in the dts files >>> (which already don't exactly match what's shipping in firmware). >> >> While every kernel maintainer seems always happy to take patches with a negative diffstat, I wonder if this is really justification enough to remove a perfectly working platform. I don't really know about any active users, but experience tells that some platforms really are used for quite a long time, even if they are somewhat obscure. N900 or Netwinder, anyone? >> >> So to not give the impression that actually *everyone* (from that small subset of people actively reading the kernel list) is happy with that, I think that having support for at least Midway would be useful. On the one hand it's a decent LPAE platform (with memory actually exceeding 4GB), and on the other hand it's something with capable I/O (SATA) and networking, so one can actually stress test the system. Which is the reason I was using that for KVM testing, but even with that probably going away now there remain still some use cases, and be it for general ARM(32) testing. > > Does LPAE with more than 4GB actually need to work if there's not > another platform out there? There are ARCH_BRCMSTB platforms that are 32-bit only and have 6GB of DRAM populated, and those continue to work just fine, though there is no known use for KVM AFAICT. -- Florian
