On 06/07/16 11:35, David Gibson wrote: > On Tue, Jul 05, 2016 at 04:42:37PM +0200, Laurent Vivier wrote: >> As device-tree is now fully built by QEMU, we don't need SLOF >> anymore if the kernel is provided on the command line. >> >> In this case, don't load SLOF and boot directly into the >> kernel. >> >> This saves at least 5 seconds on the boot sequence. >> >> Signed-off-by: Laurent Vivier <lviv...@redhat.com> > > I'm not comfortable applying this. We actually used to do this ages > ago, but changed to always running through SLOF, and there were > reasons for doing so. > > I don't remember exactly what they were, but I think it boiled down to > slight differences in state between booting from SLOF and booting > without SLOF leading to confusing errors from the guest kernel. >
PCI resource allocation is still done by SLOF (however having them not set will trigger allocation in the guest but this is rather unexpected workaround than a feature); "client-architecture-support" won't work without SLOF either (i.e. compatibile PowerISA 2.0x CPUs). -- Alexey
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