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authorMinifree Ltd <info@minifree.org>2016-04-26 11:29:11 (EDT)
committer Minifree Ltd <info@minifree.org>2016-04-26 11:33:18 (EDT)
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@@ -109,7 +109,7 @@ Every other T7200 tested so far has worked without microcode updates.
@node i945 VRAM size
@chapter i945 VRAM size
@anchor{#i945-vram-size}
-Apparently, only 8MB VRAM is available on i945 GPUs (though it could do 64MB):@* phcoder: No. Hardware default is 8 MiB. When I wanted to make it configurable, I saw that docs mention only one other alternative: 1MiB. Later isn't event enough for 1024x768 at 24bpp without any acceleration or double buffering. It's possible that there are undocumented values. Which options do you have in vendor BIOS? How to find out how much vram you have:@* phcoder: TOM - BSM@* phcoder: check what vendor BIOS offers as options@* fchmmr: I thought it could do 64MB usually@* phcoder: not accorging to doc.@* phcoder: see mobile-945-express-chipset-datasheet page 93@* phcoder: see also src/northbridge/intel/i945/@{early_init,northbridge,gma@}.c@* fchmmr: "011 = DVMT (UMA) mode, 8 MB of memory pre-allocated for@* fchmmr: frame buffer."@* fchmmr: "Others - reserved"@* phcoder: the easiest way is a loop at this position which tries different values and reads (and prints) BSM with them@* stefanct: fchmmr: they suggest that you change the value and look how BSM reacts to that@* stefanct: as they pointed out earlier vram size = TOM - BSM@* stefanct: different values of GMS@* stefanct: phcoder: hm... this could be a hint. look at the text description of TOLUD at page 103@* stefanct: it mentions 64 MB in the text about BSM as well@* stefanct: table 18...@* phcoder: stefanct: I have a guess which value make is 64 but I will not tell to avoid skewing test results@* stefanct: phcoder: sure... i assumed you were not sure if it supports it at all. testing it properly is of course a good idea :)@* stefanct: test the various possible (but reserved) values of GMS and see what the resulting VRAM size is@* fchmmr: so, TOM - BSM
+Apparently, only 8MB VRAM is available on i945 GPUs (though it could do 64MB):@* phcoder: No. Hardware default is 8 MiB. When I wanted to make it configurable, I saw that docs mention only one other alternative: 1MiB. Later isn't event enough for 1024x768 at 24bpp without any acceleration or double buffering. It's possible that there are undocumented values. Which options do you have in vendor BIOS? How to find out how much vram you have:@* phcoder: TOM - BSM@* phcoder: check what vendor BIOS offers as options@* vimuser: I thought it could do 64MB usually@* phcoder: not accorging to doc.@* phcoder: see mobile-945-express-chipset-datasheet page 93@* phcoder: see also src/northbridge/intel/i945/@{early_init,northbridge,gma@}.c@* vimuser: "011 = DVMT (UMA) mode, 8 MB of memory pre-allocated for@* vimuser: frame buffer."@* vimuser: "Others - reserved"@* phcoder: the easiest way is a loop at this position which tries different values and reads (and prints) BSM with them@* stefanct: vimuser: they suggest that you change the value and look how BSM reacts to that@* stefanct: as they pointed out earlier vram size = TOM - BSM@* stefanct: different values of GMS@* stefanct: phcoder: hm... this could be a hint. look at the text description of TOLUD at page 103@* stefanct: it mentions 64 MB in the text about BSM as well@* stefanct: table 18...@* phcoder: stefanct: I have a guess which value make is 64 but I will not tell to avoid skewing test results@* stefanct: phcoder: sure... i assumed you were not sure if it supports it at all. testing it properly is of course a good idea :)@* stefanct: test the various possible (but reserved) values of GMS and see what the resulting VRAM size is@* vimuser: so, TOM - BSM
@ref{#pagetop,Back to top of page.}
@@ -503,7 +503,7 @@ It might be the same issue I ran into with Paul on the X60 (not enough memory be
@ref{#pagetop,Back to top of page.}
-Copyright © 2014, 2015 Francis Rowe <info@@gluglug.org.uk>@* Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.3 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license can be found at @uref{../resources/licenses/gfdl-1.3.txt,gfdl-1.3.txt}
+Copyright © 2014, 2015 Minifree Ltd <info@@minifree.org>@* Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.3 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license can be found at @uref{../resources/licenses/gfdl-1.3.txt,gfdl-1.3.txt}
Updated versions of the license (when available) can be found at @uref{https://www.gnu.org/licenses/licenses.html,https://www.gnu.org/licenses/licenses.html}