On Thu, 12 Nov 2020 at 16:47, Lukas Wunner <lukas@xxxxxxxxx> wrote: > > 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? Are you advocating removing all resets that merely reapply the power-on reset state? Phil
