[PATCH V2] video: implement a simple framebuffer driver

Geert Uytterhoeven geert at linux-m68k.org
Tue Apr 9 04:08:12 EDT 2013

On Tue, Apr 9, 2013 at 2:16 AM, Andrew Morton <akpm at linux-foundation.org> wrote:
> On Wed,  3 Apr 2013 20:39:43 -0600 Stephen Warren <swarren at wwwdotorg.org> wrote:
>> A simple frame-buffer describes a raw memory region that may be rendered
>> to, with the assumption that the display hardware has already been set
>> up to scan out from that buffer.
>> This is useful in cases where a bootloader exists and has set up the
>> display hardware, but a Linux driver doesn't yet exist for the display
>> hardware.
>> ...
>> +config FB_SIMPLE
>> +     bool "Simple framebuffer support"
>> +     depends on (FB = y) && OF
> It's sad that this simple little thing requires Open Firmware.  Could
> it be generalised in some way so that the small amount of setup info
> could be provided by other means (eg, module_param) or does the
> dependency go deeper than that?

Indeed. Instead of consolidating, we seem to get more of them: offb, vesafb,
efifb, ...

cfr. near the tail of drivers/video/Makefile (don't know about all of them):
 # Platform or fallback drivers go here
obj-$(CONFIG_FB_UVESA)            += uvesafb.o
obj-$(CONFIG_FB_VESA)             += vesafb.o
obj-$(CONFIG_FB_EFI)              += efifb.o
obj-$(CONFIG_FB_VGA16)            += vga16fb.o
obj-$(CONFIG_FB_OF)               += offb.o
obj-$(CONFIG_FB_BF537_LQ035)      += bf537-lq035.o
obj-$(CONFIG_FB_BF54X_LQ043)      += bf54x-lq043fb.o
obj-$(CONFIG_FB_BFIN_LQ035Q1)     += bfin-lq035q1-fb.o
obj-$(CONFIG_FB_BFIN_T350MCQB)    += bfin-t350mcqb-fb.o
obj-$(CONFIG_FB_BFIN_7393)        += bfin_adv7393fb.o
obj-$(CONFIG_FB_MX3)              += mx3fb.o
obj-$(CONFIG_FB_DA8XX)            += da8xx-fb.o
obj-$(CONFIG_FB_MXS)              += mxsfb.o
obj-$(CONFIG_FB_SSD1307)          += ssd1307fb.o

# the test framebuffer is last
obj-$(CONFIG_FB_VIRTUAL)          += vfb.o



Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert at linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds

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