Hi, Lionel: >> In theory any drivers might be able to work on any system, but they're >> almost all the most tight to a particular >> system
Does it mean most gfxdrivers work on one of systems? for example, Davinci only works on fbdev? because I find in davinci_gfxdriver.c there is the operation to /dev/fb* . Is my understanding correct? Thanks Leon On Thu, Sep 9, 2010 at 10:48 AM, Leon Zhang <linuxzh...@gmail.com> wrote: > Hi, Lionel: > > Thank you! I understand now. > > gfxdriver implementation should be different if using the different > system, e.g. devmem and fbdev. is my understanding correct? > > could you introduce the different points of gfxdriver implementation > by the different system, e.g. devmem and fbdev briefly? or which > gfxdriver codes should be refered in directfb? > > Thanks > > leon > > > On Wed, Sep 8, 2010 at 4:35 PM, Lionel Landwerlin <llandwer...@gmail.com> > wrote: >> Hi Leon, >> >> DirectFB is splitted into several pieces. >> >> First there is the system, which is usually responsible for managing >> the graphical memory (allocate buffers >> etc...). This is where devmem, fbdev, x11 etc... are standing. >> Then you have the gfxdrivers, which contains code responsible for >> hardware acceleration. >> >> Systems do not deal directly with hardware acceleration. So you can't >> talk about "how fbdev implement hw >> accel", because it's not its job. However, systems have to provide >> graphical buffers which match the hardware >> constraints (ie. memory alignment, etc...). >> In theory any drivers might be able to work on any system, but they're >> almost all the most tight to a particular >> system. >> >> So the MMIO way might be available for any system (devmem, fbdev, >> etc...), it all depends on your gfxdriver. >> >> Regards, >> >> -- >> Lionel Landwerlin >> >> On Wed, Sep 8, 2010 at 10:18 AM, Leon Zhang <linuxzh...@gmail.com> wrote: >>> Hi, all: >>> >>> Could I know how fbdev system mode of DirectFB to implement HW accel. >>> ? I know in devmem system mode, gfxdriver will config graphic hw >>> registers by "mmio"(mmap /dev/mem to user space to access HW I/O) to >>> implement hw acceleration. But how fbdev system mode to implememt hw >>> accel.? In my understanding, "mmio" way is only available for devmem >>> system mode. Is my understanding correct? >>> >>> Thank you >>> >>> >>> Leon >>> _______________________________________________ >>> directfb-dev mailing list >>> directfb-dev@directfb.org >>> http://mail.directfb.org/cgi-bin/mailman/listinfo/directfb-dev >>> >> > _______________________________________________ directfb-dev mailing list directfb-dev@directfb.org http://mail.directfb.org/cgi-bin/mailman/listinfo/directfb-dev
