Hello, Thanks for the answers. We'll indeed investigate if we can use a 64-bit BAR.
Kind regards, Wannes -----Original Message----- From: Gerd Hoffmann <kra...@redhat.com> Sent: Wednesday, April 12, 2023 10:04 AM To: Wannes Bouwen (Nokia) <wannes.bou...@nokia.com> Cc: seabios@seabios.org Subject: Re: [SeaBIOS] Large 32 bit BAR's [U ontvangt vaak geen e-mail van kra...@redhat.com. Informatie over waarom dit belangrijk is op https://aka.ms/LearnAboutSenderIdentification] CAUTION: This is an external email. Please be very careful when clicking links or opening attachments. See the URL nok.it/ext for additional information. Hi, > I'm running a x86 QEMU with Ubuntu. On this system we want to emulate > a PCIe device which contains a large 32-bit BAR (2 GiB). This is not > working and I get following error: Why a 32-bit bar, not a 64-bit bar? A 2G 32-bit bar simply can't be mapped anywhere on x86. It must be below 4G, and it must be 2G-aligned. Which leaves exactly two options: 0G -> 2G or 2G -> 4G. Both overlap with resources critical for x86 boot, the former with the real mode address space (0-1M) and the latter with lapic, ioapic, hpet, tpm etc just below 4G. take care, Gerd _______________________________________________ SeaBIOS mailing list -- seabios@seabios.org To unsubscribe send an email to seabios-le...@seabios.org
