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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Nouveau driver doesn't find vbios for Geforce GT 750M on Asus N750JV laptop"
href="https://bugs.freedesktop.org/show_bug.cgi?id=70208#c3">Comment # 3</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Nouveau driver doesn't find vbios for Geforce GT 750M on Asus N750JV laptop"
href="https://bugs.freedesktop.org/show_bug.cgi?id=70208">bug 70208</a>
from <span class="vcard"><a class="email" href="mailto:emil.l.velikov@gmail.com" title="Emil Velikov <emil.l.velikov@gmail.com>"> <span class="fn">Emil Velikov</span></a>
</span></b>
<pre>From the MMIO trace - the binary driver seems to be retrying in a very unusual
manner to retrieve the vbios from ACPI.
[mem 0x00000000c9e25000-0x00000000cab27fff] ACPI NVS
acpi_vbios() {
W 0x088050 0x00000000 PPCI.ROM_SHADOW_ENABLE <= 0
origin = 0xc9eca000;
size = 0x1000;
MAP $origin $size
UNMAP
base = origin;
for (i = 0; i < ??; i++) {
for (j = 0; j < 8; j++) {
for (k = 1; k <= 8; k++) {
MAP $base+(k*$size) $size
UNMAP
}
MAP $base $size
SLEEP 0.182000ms
UNMAP
}
base += 8*$size;
}
}
Not entirely sure if it succeeds though, but after this sequence it seems to be
doing all sorts of stupid stuff as init script tables do.
R 0x000000 0x0e7240a2 PMC.ID
W 0x000000 0x0e7240a2
etc.</pre>
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