On Thu, Nov 12, 2020 at 04:42:28PM +0000, Phil Elwell wrote: > On Thu, 12 Nov 2020 at 16:28, Jim Quinlan <james.quinlan@xxxxxxxxxxxx> wrote: > > As for me considering that this line is superfluous -- which > > apparently it is not : AFAIK PERST# is always asserted from cold start > > on all Brcm STB SOCs, and I expected the same on the RPi. Asserting > > PERST# at this point in time should be a no-op. Is this not the case? > > The reason it isn't superfluous here is that when using USB to boot, > the Raspberry Pi BCM2711 firmware will already have configured the > PCIe bus once, so another reset is necessary. I think that begs the question why the firmware doesn't reset the PCIe bus before handing over control to the kernel? Thanks, Lukas
