On Mon, Mar 10, 2025 at 04:44:27PM +0100, Patrick Rudolph wrote: > Hi Tom, > On Mon, Mar 10, 2025 at 3:30 PM Tom Rini <tr...@konsulko.com> wrote: > > > > On Mon, Mar 10, 2025 at 10:01:32AM +0100, Patrick Rudolph wrote: > > > > > Legacy PCI devices, like qemu's Bochs VGA device, are allowed to have > > > prefetchable 32-bit BARs, while PCIe devices are not allowed to have > > > 32-bit prefetchable BARs. Typically prefetchable BARs are 64-bit and > > > typically the prefetch MMIO window is also 64-bit and placed above > > > 4GiB, as it's the case on qemu sbsa-ref. > > > > > > Currently the U-Boot code assumes that prefetchable BARs are > > > 64-bit BARs and always tries to assign them into the prefetch > > > MMIO window. > > > > > > When a 32-bit BAR is marked as prefetch, but the prefetch area is > > > not within the first 4GiB of the address space, then downgrade the > > > BAR and place it in the non-prefetch MMIO window. > > > > > > For prefetch BARs there's no downside on being placed in non prefetch > > > MMIO areas, besides the possible slower performance when a driver tries > > > to map it Write-Combine. > > > > > > TEST: Fixes pci_auto on QEMU sbsa-ref fails to autoconfigure BAR0. > > > > > > Signed-off-by: Patrick Rudolph <patrick.rudo...@9elements.com> > > > > Do we need this series for v2025.04 or v2025.07? Thanks! > since this series only gets pre OS graphics working I'd say it's a > cosmetic fix for v2025.07.
Thanks. The original series was on my TODO list for this week for -next, so I'll take this sometime this week. -- Tom
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