On Sat, Sep 19, 2020, 4:42 PM Karel Gardas <karel.gar...@centrum.cz> wrote:
> On 9/19/20 10:32 AM, Christian Mauderer wrote: > > Hello Karel, > > > > I wasn't aware that there is a framebuffer driver in the PC BSP. > > Yes, in fact there are three FB drivers in pc386 BSP family: > > - for VGA card > - for Cirrus Logic GD5446 card > - for VESA BIOS Extension capable graphics card > > The latest one is enabled by default and that's what I'm trying to use. > > > Maybe > > an alternative to using the BSP framebuffer driver could be to just port > > the FreeBSD framebuffer driver for PC and use that one? That might could > > be less work than fixing the PC BSPs driver. > > Hmm. Just a brief check reveals that FB also supports several FB drivers: > > - for EFI frame buffer > - for KMS enabled graphics card with vt_fb backend > > The former seems to be available on UEFI based systems only. The later > seems to depends on DRM code which is *huge*. I've just meassured drm > code from OpenBSD and this is more code than whole RTEMS kernel. > (git://git.rtems.org/rtems.git) and that just implementing DRM for Intel > and AMD cards... > > In comparison with that pc386 fbs are light weight. > > Also FreeBSD vga driver which supports VESA BIOS Extensions does not > seems to enable framebuffer... > > > If you want to continue to use the BSPs driver, I can try to have a more > > detailled look at it. > > I think I can also do something as I do have setup here -- just try to > debug into mmap to see why it's not able to mmap /dev/fd0 and this way > get more info about the failure... > Gedare wrote the current POSIX shm and mmap support. I know it has a plugin architecture to enable mapping shared memory between partitions in Does+RTEMS. It could be as simple as the device file type in the IMFS is defaulting a file operation it needs to support. Start a separate thread with a more specific subject and Gedare will probably pipe up. > > But like I said: I would expect that the FreeBSD > > driver is simpler to use. > > I'm not so sure, see above, but please correct me if I'm wrong since > especially I'm expert on neither FBSD, frame buffers and C... > > Thanks, > Karel > _______________________________________________ > devel mailing list > devel@rtems.org > http://lists.rtems.org/mailman/listinfo/develdevixe. >
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