Re: kern/57035: On UEFI-booted NetBSD/amd64, genfb(4) freezes when WSDISPLAYIO_MODE_EMUL is set

To: gnats-bugs%netbsd.org@localhost, kern-bug-people%netbsd.org@localhost, gnats-admin%netbsd.org@localhost, netbsd-bugs%netbsd.org@localhost, ryoon%netbsd.org@localhost
Subject: Re: kern/57035: On UEFI-booted NetBSD/amd64, genfb(4) freezes when WSDISPLAYIO_MODE_EMUL is set
From: Rin Okuyama <rokuyama.rk%gmail.com@localhost>
Date: Fri, 30 Sep 2022 16:47:59 +0900

Hi,

Although I could not reproduce the problem on my amd64 machine with
genfb(4), I've found two bugs possibly related to this problem.

When the mode is set to WSDISPLAYIO_MODE_EMUL:

- if the device has 64-bit BARs, their lower words are zero-cleared
- if its expansion ROM was disabled by default, it is disabled again

Can you try this patch?
https://gist.github.com/rokuyama/9c50609396df00882b57be2cc2f0bc52

Thanks,
rin

References:
- kern/57035: On UEFI-booted NetBSD/amd64, genfb(4) freezes when WSDISPLAYIO_MODE_EMUL is set
  - From: ryoon

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