UEFI GOP: screen goes blank during boot after loader is finished

[Subbsd]

On Fri, Nov 16, 2018 at 8:03 AM Warner Losh <imp at bsdimp.com> wrote:
>
>
>
> On Thu, Nov 15, 2018 at 12:10 PM Rebecca Cran <rebecca at bluestop.org> wrote:
>>
>> On Wednesday, 14 November 2018 19:56:56 MST Warner Losh wrote:
>>
>> > What is the ConOut evifar look like? We set serial when the UEFI env says
>> > to do  so.
>>
>> Booting with:
>>
>> sudo bhyve -A -P -c 2 -H -m 4G -s 0:0,hostbridge -s 31:0,lpc -s 2,ahci-
>> cd,FreeBSD-12.0-BETA4-amd64-disc1.iso -s
>> 29,fbuf,tcp=0.0.0.0:5900,w=800,h=600,wait -l bootrom,/usr/local/share/uefi-
>> firmware/BHYVE_UEFI.fd -u vm5
>>
>> dh in the shell shows:
>>
>> 7D: ConsoleOut SimpleTextOut GraphicsOutput(GraphicsOutput)
>> PCIIO DevicePath(PciRoot (0x0)/Pci(0x1D,0x0))
>>
>> 84: StdErr ConsoleOut ConsoleIn SimpleTextOut SimpleTextInEx SimpleTextIn
>> DevicePath(t(115200,8,N,1)/VenVt100Plus())
>>
>> 89: SimpleTextOut SimpleTextInEx SimpleTextIn DevicePath(Uart(115200,8,N,1)/
>> VenPcAnsi())
>
>
> If I read that right, then the ConOut variable first has the video device listed, then the serial port (this wasn't the form I expected to see it in, so I'm not sure thats the case). In either event, we should get console output on both the serial and the video at least until the /etc/rc script starts...
>
> Warner

Perhaps this is not a special case of FreeBSD guest, since the latest
versions of FreeBSD are loaded normally in other UEFI systems (e.g
Virtualbox, KVM). For example someone from CBSD Telegram chat reported
a similar problem for OpenIndiana 2018 ( which uses FreeBSD loader
however) in bhyve.
Thus, perhaps the root of this problem should be sought in
uefi-edk2-bhyve the package. Latest CBSD release (12.0.1) fixed this
problem by disabling serial console. However, CBSD uses an alternative
boot method  for bhyve ( uefi-edk2-bhyve + reFIND )