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Subject: Re: [PATCH] vgacon: Fall back to the dummy console if mapping VGA
 memory fails
To: Matt Turner <mattst88@gmail.com>, Magnus Lindholm <linmag7@gmail.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
 linux-fbdev@vger.kernel.org, dri-devel@lists.freedesktop.org,
 linux-kernel@vger.kernel.org, linux-alpha@vger.kernel.org
References: <20261111-vgacon-ioremap-null-v1-1-6dd05bf390ef@gmail.com>
 <CA+=Fv5SHTC9XWQJZY7DnZbpMPnk3b7eYNiiH6Dnii+eLJo9YgA@mail.gmail.com>
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On 11/12/26 09:47, Magnus Lindholm wrote:
> Hi Matt,
>=20
> On Thu, Nov 12, 2026 at 1:30=E2=80=AFAM Matt Turner <mattst88@gmail.com>=
 wrote:
>>
>> On Alpha, setup_arch() registers vgacon whenever CONFIG_VGA_CONSOLE is
>> enabled. On Marvel (EV7) systems whose SRM console is serial, no VGA
>> hose is set, so marvel_ioremap() finds no hose for 0xb8000 and returns
>> NULL. vgacon_startup() then probes video memory through that NULL
>> pointer and oopses in console_init():
>>
>>    Unable to handle kernel paging request at virtual address 0000000000=
000000
>>    pc is at vgacon_startup+0x174/0x910
>>
>> VGA_MAP_MEM() is ioremap() on Alpha and powerpc and can fail. Treat
>> failure like a failed probe and fall back to the dummy console. If a
>> VGA card is present, locate_and_init_vga() still switches to vgacon
>> once PCI is up.
>>
>> Cc: stable@vger.kernel.org
>> Assisted-by: Claude:claude-opus-5-5
>> Signed-off-by: Matt Turner <mattst88@gmail.com>
>> ---
>>   drivers/video/console/vgacon.c | 2 ++
>>   1 file changed, 2 insertions(+)
>>
>> diff --git a/drivers/video/console/vgacon.c b/drivers/video/console/vga=
con.c
>> index e7e6750f1f87..09f7c376b468 100644
>> --- a/drivers/video/console/vgacon.c
>> +++ b/drivers/video/console/vgacon.c
>> @@ -324,6 +324,8 @@ static const char *vgacon_startup(void)
>>          }
>>
>>          vga_vram_base =3D VGA_MAP_MEM(vga_vram_base, vga_vram_size);
>> +       if (!vga_vram_base)
>> +               goto no_vga;
>>          vga_vram_end =3D vga_vram_base + vga_vram_size;
>>
>>          /*
>>
> ....
>=20
> Reviewed-by: Magnus Lindholm <linmag7@gmail.com>
> Tested-by: Magnus Lindholm <linmag7@gmail.com>
applied to fbdev git tree.

Thanks!
Helge