Hi Heiko, Heiko Schocher wrote: > Hello Hannes, > > Am 06.03.2014 15:24, schrieb Hannes Petermaier: >> On 2014-03-06 14:58, Heiko Schocher wrote: >>> Hello Hannes, >>> >>> Am 06.03.2014 14:39, schrieb Hannes Petermaier: >>>> - Adds support for a minimal framebuffer driver of TI's AM335x SoC >>>> to be compatible with Wolfgang Denk's LCD-Framework (CONFIG_LCD, >>>> common/lcd.c) >>>> >>>> Signed-off-by: Hannes Petermaier<oe5...@oevsv.at> >>>> --- >>>> drivers/video/Makefile | 1 + >>>> drivers/video/am335x-fb.c | 169 >>>> +++++++++++++++++++++++++++++++++++++++++++++ >>>> drivers/video/am335x-fb.h | 67 ++++++++++++++++++ >>>> 3 files changed, 237 insertions(+) >>>> create mode 100644 drivers/video/am335x-fb.c >>>> create mode 100644 drivers/video/am335x-fb.h >>> >>> Why you cannot use: >>> >>> u-boot:drivers/video/da8xx-fb.c ? >>> >>> bye, >>> Heiko >> Hi Heiko, >> >> for my opinion this clone of the linux-driver is very overloaded and >> difficult to use/configure. >> With the words 'small-is-beautiful' and 'keep-it-simple' i've wrote a >> few lines which do the minimum: >> - configure raster-controller >> - setup DMA >> - powerON Display >> >> maybe we can use the small-version in other projects too. > > Why is it difficult to use/configure the existing driver? > > Look for example into the board/siemens/pxm2/board.c board, which uses > this driver. You have to define: > > static struct da8xx_panel lcd_panels[] > static const struct display_panel disp_panel > static const struct lcd_ctrl_config lcd_cfg > > and call "da8xx_video_init(&lcd_panels[0], &lcd_cfg, lcd_cfg.bpp);" > > Thats all ...
i've looked around again for using the da8xx-fb driver and found another detail which motivated me for writing a new instance. -- par->vram_virt = malloc(par->vram_size); par->vram_phys = (dma_addr_t) par->vram_virt; debug("Requesting 0x%x bytes for framebuffer at 0x%x\n", (unsigned int)par->vram_size, (unsigned int)par->vram_virt); if (!par->vram_virt) { printf("GLCD: malloc for frame buffer failed\n"); goto err_release_fb; } gd->fb_base = (int)par->vram_virt; -- da8xx-fb.c does allocate a new framebuffer by itself. But in my case lcd-framework allready has reserved memory (on top of ram) for framebuffer usage and i want use this memory from lcd-framework for two reasons: - don't waste memory - have this memory really on top of ram to give the following OS (in my case vxWorks) a pointer where it have to write Video-data. maybe there are other possibilites to achieve this. any ideas ? > bye, > Heiko many thanks and best regards, Hannes _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot