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[AMD Official Use Only - Internal Distribution Only]<br>
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<div>Does the VBIOS come up with something like a splash screen, ie is VBIOS able to initialize and drive the card ?<br>
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<div>If so then another option might be to use a VESA driver rather than VGA. <br>
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<div id="divRplyFwdMsg" dir="ltr"><font style="font-size:11pt" face="Calibri, sans-serif" color="#000000"><b>From:</b> amd-gfx <amd-gfx-bounces@lists.freedesktop.org> on behalf of Alex Deucher <alexdeucher@gmail.com><br>
<b>Sent:</b> February 18, 2020 8:50 AM<br>
<b>To:</b> Yusuf Altąparmak <yusufalti1997@gmail.com><br>
<b>Cc:</b> amd-gfx list <amd-gfx@lists.freedesktop.org><br>
<b>Subject:</b> Re: writing custom driver for VGA emulation ?</font>
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<div class="PlainText">On Tue, Feb 18, 2020 at 2:56 AM Yusuf Altąparmak<br>
<yusufalti1997@gmail.com> wrote:<br>
><br>
> Hello AMD team;<br>
><br>
> I have E 9171 GPU and want to use it on a embedded system which has limited MMIO space on PCIe bus (MAX 512 MB).<br>
><br>
> I received feedbacks that I can only use VGA emulation with this memory space. I was unable to get 'amdgpu' driver working with Xorg due to I had many errors(firmwares are not loading) in each step and tired of solving them one by one.<br>
><br>
> I want to write a simple custom driver for this GPU with kernel version 4.19.<br>
> Is it possible to print some colors on screen with a custom driver over PCIe communication ? or writing some words on screen as VGA ?<br>
><br>
> If answer is yes, then which code pieces (on amdgpu driver folder) or reference documentation should I use? I have Register Reference Guide.pdf.<br>
><br>
> I will be appreciated for your guidance.<br>
<br>
That is not going to do what you want on your platform. The VGA<br>
emulation requires that you set up the card first to enable it, which<br>
in turn requires MMIO access and thus you are back to square one.<br>
<br>
Alex<br>
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