NetBSD Problem Report #59410

From www@netbsd.org  Fri May  9 13:20:56 2025
Return-Path: <www@netbsd.org>
Received: from mail.netbsd.org (mail.netbsd.org [199.233.217.200])
	(using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)
	 key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256
	 client-signature RSA-PSS (2048 bits) client-digest SHA256)
	(Client CN "mail.NetBSD.org", Issuer "mail.NetBSD.org CA" (not verified))
	by mollari.NetBSD.org (Postfix) with ESMTPS id C56751A923D
	for <gnats-bugs@gnats.NetBSD.org>; Fri,  9 May 2025 13:20:55 +0000 (UTC)
Message-Id: <20250509132054.A6C0B1A9241@mollari.NetBSD.org>
Date: Fri,  9 May 2025 13:20:54 +0000 (UTC)
From: jiaxun.yang@flygoat.com
Reply-To: jiaxun.yang@flygoat.com
To: gnats-bugs@NetBSD.org
Subject: New driver: bochsfb (patch)
X-Send-Pr-Version: www-1.0

>Number:         59410
>Category:       kern
>Synopsis:       New driver: bochsfb (patch)
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          change-request
>Submitter-Id:   net
>Arrival-Date:   Fri May 09 13:25:00 +0000 2025
>Last-Modified:  Sat Jan 31 12:15:02 +0000 2026
>Originator:     Jiaxun Yang
>Release:        current
>Organization:
>Environment:
current
>Description:
Add a new driver bochsfb, which is a framebuffer device emulated by QEMU, and bochs.

Tested with QEMU devices:
-vga std
-vga virtio
-device VGA
-device bochs-display
-device secondary-vga
-device virtio-vga

This driver is useful when kern is booted without firmware runtime video support. (i.e. fdt booting for riscv/arm, PMON/YAMON for MIPS). For x86, genfb is more sutiable, thus only enabled for arm generic kernel at the moment.

Patch at: https://github.com/NetBSD/src/pull/48



>How-To-Repeat:
Boot
>Fix:
Patch: https://github.com/NetBSD/src/pull/48

>Audit-Trail:
From: nia <nia@NetBSD.org>
To: gnats-bugs@netbsd.org
Cc: 
Subject: Re: kern/59410: New driver: bochsfb (patch)
Date: Wed, 3 Dec 2025 23:14:50 +0000

 Hi! Sorry for only getting back just now. Do you have an example
 qemu command line that can be used for testing this driver?

From: "Jiaxun Yang" <jiaxun.yang@flygoat.com>
To: gnats-bugs@netbsd.org, kern-bug-people@netbsd.org, gnats-admin@netbsd.org,
 netbsd-bugs@netbsd.org
Cc: 
Subject: Re: kern/59410: New driver: bochsfb (patch)
Date: Fri, 05 Dec 2025 16:48:16 +0800

 Hi nia,

 Sure! To test this driver on Arm64:

 ```
 ./build.sh -U -u -j8 -O ~/obj -m evbarm -a aarch64 kernel=GENERIC64
 qemu-system-aarch64 -M virt -cpu cortex-a57 -smp 1 -m 4g -kernel ~/obj/sys/arch/evbarm/compile/GENERIC64/netbsd.img -serial stdio -device bochs-display
 ```

 You should be able to see console on QEMU display.

 Thanks

 On Thu, 4 Dec 2025, at 7:15 AM, nia via gnats wrote:
 > The following reply was made to PR kern/59410; it has been noted by GNATS.
 >
 > From: nia <nia@NetBSD.org>
 > To: gnats-bugs@netbsd.org
 > Cc: 
 > Subject: Re: kern/59410: New driver: bochsfb (patch)
 > Date: Wed, 3 Dec 2025 23:14:50 +0000
 >
 >  Hi! Sorry for only getting back just now. Do you have an example
 >  qemu command line that can be used for testing this driver?

 -- 
 - Jiaxun

From: "Jiaxun Yang" <jiaxun.yang@flygoat.com>
To: gnats-bugs@netbsd.org, kern-bug-people@netbsd.org, gnats-admin@netbsd.org,
 netbsd-bugs@netbsd.org
Cc: 
Subject: Re: kern/59410: New driver: bochsfb (patch)
Date: Fri, 05 Dec 2025 22:18:53 +0800

 I have updated pull request to rebase and include bochsfb.4 man page.

 Thanks

 On Fri, 5 Dec 2025, at 5:10 PM, Jiaxun Yang via gnats wrote:
 > The following reply was made to PR kern/59410; it has been noted by GNATS.
 >
 > From: "Jiaxun Yang" <jiaxun.yang@flygoat.com>
 > To: gnats-bugs@netbsd.org, kern-bug-people@netbsd.org, gnats-admin@netbsd.org,
 >  netbsd-bugs@netbsd.org
 > Cc: 
 > Subject: Re: kern/59410: New driver: bochsfb (patch)
 > Date: Fri, 05 Dec 2025 16:48:16 +0800
 >
 >  Hi nia,
 > 
 >  Sure! To test this driver on Arm64:
 > 
 >  ```
 >  ./build.sh -U -u -j8 -O ~/obj -m evbarm -a aarch64 kernel=GENERIC64
 >  qemu-system-aarch64 -M virt -cpu cortex-a57 -smp 1 -m 4g -kernel 
 > ~/obj/sys/arch/evbarm/compile/GENERIC64/netbsd.img -serial stdio 
 > -device bochs-display
 >  ```
 > 
 >  You should be able to see console on QEMU display.
 > 
 >  Thanks
 > 
 >  On Thu, 4 Dec 2025, at 7:15 AM, nia via gnats wrote:
 >  > The following reply was made to PR kern/59410; it has been noted by GNATS.
 >  >
 >  > From: nia <nia@NetBSD.org>
 >  > To: gnats-bugs@netbsd.org
 >  > Cc: 
 >  > Subject: Re: kern/59410: New driver: bochsfb (patch)
 >  > Date: Wed, 3 Dec 2025 23:14:50 +0000
 >  >
 >  >  Hi! Sorry for only getting back just now. Do you have an example
 >  >  qemu command line that can be used for testing this driver?
 > 
 >  -- 
 >  - Jiaxun

 -- 
 - Jiaxun

From: "Nia Alarie" <nia@netbsd.org>
To: gnats-bugs@gnats.NetBSD.org
Cc: 
Subject: PR/59410 CVS commit: src
Date: Sat, 31 Jan 2026 12:12:58 +0000

 Module Name:	src
 Committed By:	nia
 Date:		Sat Jan 31 12:12:58 UTC 2026

 Modified Files:
 	src/distrib/sets/lists/man: mi
 	src/distrib/sets/lists/manhtml: mi
 	src/share/man/man4: Makefile
 	src/sys/arch/evbarm/conf: GENERIC64
 	src/sys/dev/pci: files.pci
 Added Files:
 	src/share/man/man4: bochsfb.4
 	src/sys/dev/pci: bochsfb.c bochsfbreg.h bochsfbvar.h

 Log Message:
 Import Jiaxun Yang's bochsfb(4) driver.

 This is useful for getting graphics on qemu-system-aarch64 without
 firmware runtime video support (e.g. using the -kernel option). At the
 moment it is only wired up for -device VGA and -device secondary-vga
 so that it doesn't conflict with viogpu.

 PR kern/59410


 To generate a diff of this commit:
 cvs rdiff -u -r1.1826 -r1.1827 src/distrib/sets/lists/man/mi
 cvs rdiff -u -r1.45 -r1.46 src/distrib/sets/lists/manhtml/mi
 cvs rdiff -u -r1.749 -r1.750 src/share/man/man4/Makefile
 cvs rdiff -u -r0 -r1.1 src/share/man/man4/bochsfb.4
 cvs rdiff -u -r1.229 -r1.230 src/sys/arch/evbarm/conf/GENERIC64
 cvs rdiff -u -r0 -r1.1 src/sys/dev/pci/bochsfb.c src/sys/dev/pci/bochsfbreg.h \
     src/sys/dev/pci/bochsfbvar.h
 cvs rdiff -u -r1.451 -r1.452 src/sys/dev/pci/files.pci

 Please note that diffs are not public domain; they are subject to the
 copyright notices on the relevant files.

Home	PR Database Search