<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-3"> <style type="text/css" style="display:none;"> P {margin-top:0;margin-bottom:0;} </style> </head> <body dir="ltr"> <p style="font-family:Arial;font-size:10pt;color:#0078D7;margin:15pt;" align="Left"> [AMD Official Use Only - Internal Distribution Only]<br> </p> <br> <div> <div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);"> >And we already checked, 256MB is unfortunately the minimum you can resize the VRAM BAR on the E9171 to.<br> </div> <div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);"> <br> </div> <div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);"> Ahh, OK... I didn't realize we had already looked into that. I guess that approach isn't going to work. <br> </div> <div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);"> <br> </div> <div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);"> Yusef, guessing you are using a 32-bit CPU ? Is it possible to talk to whoever does SBIOS for your platform to see if you could maybe reduce address space allocated to RAM and bump up the MMIO space ?<br> </div> <div> <div id="appendonsend"></div> <div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)"> <br> </div> <hr tabindex="-1" style="display:inline-block; width:98%"> <div id="divRplyFwdMsg" dir="ltr"><font style="font-size:11pt" face="Calibri, sans-serif" color="#000000"><b>From:</b> Christian König <ckoenig.leichtzumerken@gmail.com><br> <b>Sent:</b> February 18, 2020 9:19 AM<br> <b>To:</b> Bridgman, John <John.Bridgman@amd.com>; Alex Deucher <alexdeucher@gmail.com>; Yusuf Altšparmak <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> <div> </div> </div> <div style="background-color:#FFFFFF"> <div class="x_moz-cite-prefix">The problem Yusuf runs into is that his platform has multiple PCIe root hubs, but only 512MB of MMIO address space. That is not enough to fit all the BARs of an E9171 into.<br> <br> But without the BARs neither the VGA emulation nor amdgpu not anything else will work correctly.<br> <br> And we already checked, 256MB is unfortunately the minimum you can resize the VRAM BAR on the E9171 to.<br> <br> What could maybe work is to trick the upstream bridge of the VGA device into not routing all the addresses to the BARs and actually use only a smaller portion of visible VRAM. But that would be highly experimental and requires a rather big hack into the PCI(e) subsystem in the Linux kernel.<br> <br> Regards,<br> Christian.<br> <br> Am 18.02.20 um 15:08 schrieb Bridgman, John:<br> </div> <blockquote type="cite"> <p style="margin-top: 0px; margin-bottom: 0px;font-family:Arial; font-size:10pt; color:#0078D7; margin:15pt" align="Left"> [AMD Official Use Only - Internal Distribution Only]<br> </p> <br> <div> <div>Does the VBIOS come up with something like a splash screen, ie is VBIOS able to initialize and drive the card ?<br> </div> <div><br> </div> <div>If so then another option might be to use a VESA driver rather than VGA. <br> </div> <div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)"> <br> </div> <div> <div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)"> <br> </div> <hr tabindex="-1" style="display:inline-block; width:98%"> <div id="x_divRplyFwdMsg" dir="ltr"><font style="font-size:11pt" face="Calibri, sans-serif" color="#000000"><b>From:</b> amd-gfx <a class="x_moz-txt-link-rfc2396E" href="mailto:amd-gfx-bounces@lists.freedesktop.org"> <amd-gfx-bounces@lists.freedesktop.org></a> on behalf of Alex Deucher <a class="x_moz-txt-link-rfc2396E" href="mailto:alexdeucher@gmail.com"> <alexdeucher@gmail.com></a><br> <b>Sent:</b> February 18, 2020 8:50 AM<br> <b>To:</b> Yusuf Altšparmak <a class="x_moz-txt-link-rfc2396E" href="mailto:yusufalti1997@gmail.com"> <yusufalti1997@gmail.com></a><br> <b>Cc:</b> amd-gfx list <a class="x_moz-txt-link-rfc2396E" href="mailto:amd-gfx@lists.freedesktop.org"> <amd-gfx@lists.freedesktop.org></a><br> <b>Subject:</b> Re: writing custom driver for VGA emulation ?</font> <div> </div> </div> <div class="x_BodyFragment"><font size="2"><span style="font-size:11pt"> <div class="x_PlainText">On Tue, Feb 18, 2020 at 2:56 AM Yusuf Altšparmak<br> <a class="x_moz-txt-link-rfc2396E" href="mailto:yusufalti1997@gmail.com"><yusufalti1997@gmail.com></a> 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> _______________________________________________<br> amd-gfx mailing list<br> <a class="x_moz-txt-link-abbreviated" href="mailto:amd-gfx@lists.freedesktop.org">amd-gfx@lists.freedesktop.org</a><br> <a href="https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Flists.freedesktop.org%2Fmailman%2Flistinfo%2Famd-gfx&data=02%7C01%7CJohn.Bridgman%40amd.com%7Ccda5469b6f5f4ae43e6d08d7b47d899a%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C637176323587003958&sdata=6eKo51jnHbE1QWkDB%2BN%2FFLMLB40HA2wVN3mU1l%2FeFhk%3D&reserved=0" originalsrc="https://lists.freedesktop.org/mailman/listinfo/amd-gfx" shash="U6meQaXVtmMvUg9YEUEclm83S+Z07KrR9tCRISlpsrQ2MhZ3nHWjky8Y5XYAe9N+vGF9XTpXLPgG33LoV6btCVtFURjkdXC6O1izBKd19S+02Npep/Uw50puidKypM969urqdIFuT0ZCb9NZI4a8/iRekjRKHFXPNbeIJs51WNo=">https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Flists.freedesktop.org%2Fmailman%2Flistinfo%2Famd-gfx&data=02%7C01%7Cjohn.bridgman%40amd.com%7Ce7bf224775ad487d240708d7b47992f4%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C637176306561328560&sdata=QbfaIN%2F6LvgUihz5O0x41TwvdGYy7QTS5IVJq3RXYlA%3D&reserved=0</a><br> </div> </span></font></div> </div> </div> <br> <fieldset class="x_mimeAttachmentHeader"></fieldset> <pre class="x_moz-quote-pre">_______________________________________________ amd-gfx mailing list <a class="x_moz-txt-link-abbreviated" href="mailto:amd-gfx@lists.freedesktop.org">amd-gfx@lists.freedesktop.org</a> <a class="x_moz-txt-link-freetext" href="https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Flists.freedesktop.org%2Fmailman%2Flistinfo%2Famd-gfx&data=02%7C01%7CJohn.Bridgman%40amd.com%7Ccda5469b6f5f4ae43e6d08d7b47d899a%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C637176323587003958&sdata=6eKo51jnHbE1QWkDB%2BN%2FFLMLB40HA2wVN3mU1l%2FeFhk%3D&reserved=0" originalsrc="https://lists.freedesktop.org/mailman/listinfo/amd-gfx" shash="U6meQaXVtmMvUg9YEUEclm83S+Z07KrR9tCRISlpsrQ2MhZ3nHWjky8Y5XYAe9N+vGF9XTpXLPgG33LoV6btCVtFURjkdXC6O1izBKd19S+02Npep/Uw50puidKypM969urqdIFuT0ZCb9NZI4a8/iRekjRKHFXPNbeIJs51WNo=">https://lists.freedesktop.org/mailman/listinfo/amd-gfx</a> </pre> </blockquote> <br> </div> </div> </div> </body> </html>