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Add a sysctl to allow disabling resetting the OF syscons.

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On some machines (G5 with lots of RAM), entering OF sometimes causes the
machine to hang.  Once the machine is booted, currently the only entry point
into OF is through resetting the framebuffer on mode switch on these machines.
Disabling this allows the machine to stay up at the expense of less usable
consoles after X is started.

MFC after:	Never, this is only a hack
This commit is contained in:
Justin Hibbits 2013-11-17 20:29:33 +00:00
parent 8ec08b0a21
commit 776fd11e30
1 changed files with 23 additions and 18 deletions
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41
sys/powerpc/ofw/ofw_syscons.c
View File

@ -57,9 +57,12 @@ __FBSDID("$FreeBSD$");
#include <powerpc/ofw/ofw_syscons.h>
static int ofwfb_ignore_mmap_checks = 1;
static int ofwfb_reset_on_switch = 1;
static SYSCTL_NODE(_hw, OID_AUTO, ofwfb, CTLFLAG_RD, 0, "ofwfb");
SYSCTL_INT(_hw_ofwfb, OID_AUTO, relax_mmap, CTLFLAG_RW,
&ofwfb_ignore_mmap_checks, 0, "relaxed mmap bounds checking");
SYSCTL_INT(_hw_ofwfb, OID_AUTO, reset_on_mode_switch, CTLFLAG_RW,
&ofwfb_reset_on_switch, 0, "reset the framebuffer driver on mode switch");
extern u_char dflt_font_16[];
extern u_char dflt_font_14[];
@ -447,26 +450,28 @@ ofwfb_set_mode(video_adapter_t *adp, int mode)
sc = (struct ofwfb_softc *)adp;
/*
* Open the display device, which will initialize it.
*/
memset(name, 0, sizeof(name));
OF_package_to_path(sc->sc_node, name, sizeof(name));
ih = OF_open(name);
if (sc->sc_depth == 8) {
if (ofwfb_reset_on_switch) {
/*
* Install the ISO6429 colormap - older OFW systems
* don't do this by default
* Open the display device, which will initialize it.
*/
for (i = 0; i < 16; i++) {
OF_call_method("color!", ih, 4, 1,
ofwfb_cmap[i].red,
ofwfb_cmap[i].green,
ofwfb_cmap[i].blue,
i,
&retval);
memset(name, 0, sizeof(name));
OF_package_to_path(sc->sc_node, name, sizeof(name));
ih = OF_open(name);
if (sc->sc_depth == 8) {
/*
* Install the ISO6429 colormap - older OFW systems
* don't do this by default
*/
for (i = 0; i < 16; i++) {
OF_call_method("color!", ih, 4, 1,
ofwfb_cmap[i].red,
ofwfb_cmap[i].green,
ofwfb_cmap[i].blue,
i,
&retval);
}
}
}