Messages in this thread | | | Date | Wed, 2 Dec 2009 10:06:41 -0700 | Subject | Re: Dynamically attaching fbcon to a framebuffer | From | "Rick L. Vinyard, Jr." <> |
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Alan Cox wrote: >> I have the display as a framebuffer device now (based on fbdefio with >> the >> hid device as the parent). >> >> Do I really need a separate console device or can I just use fbcon? > > fbcon should do what you want. >
I've been playing with fbcon, but can't get a fbcon console started.
I wrote a little app that uses the framebuffer ioctls to change fbcon's map. Specifically, the G13 shows up as fb1, and the app basically does this:
int fd = open("/dev/fb1", O_RDWR); struct fb_con2fbmap con2fb; int ret;
if ( fd < 0 ) { printf("Error opening %s\n", DEVICE); return -1; }
con2fb.console = 5;
ioctl(fd, FBIOGET_CON2FBMAP, &con2fb); printf("Console: %d Framebuffer: %d\n", con2fb.console, con2fb.framebuffer);
con2fb.framebuffer = 1; ret = ioctl(fd, FBIOPUT_CON2FBMAP, &con2fb); printf("Succeeded: %d\n", ret);
ioctl(fd, FBIOGET_CON2FBMAP, &con2fb); printf("Console: %d Framebuffer: %d\n", con2fb.console, con2fb.framebuffer);
This succeeds and I get: Console: 5 Framebuffer: 0 Succeeded: 0 Console: 5 Framebuffer: 1
But, when I change to console 5 that's when things die. I never hit any of my fb_ops callbacks.
The driver can be found here: http://g13.svn.sourceforge.net/viewvc/g13/driver/trunk/hid-g13.h http://g13.svn.sourceforge.net/viewvc/g13/driver/trunk/hid-g13.c
This doesn't actually do anything but do a printk (in hex) of the framebuffer memory.
When I modify the framebuffer through a mmap I don't have any problems, but when I switch to the console the kernel hangs.
I'm currently recompiling the kernel with FBCONDEBUG defined and I'll test from there.
Any other suggestions on how to approach this?
Thanks,
---
Rick
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