Hello Mr.Bin, Hello Mr.George McCollister,
I am working on an embedded project to optimize Linux boot up time. I have a camera application, which I need to run as fast as possible after powering up the board.
For this currently I am analyzing how can I optimize the U-boot. As of now, u-boot takes around 3 to 4 seconds and most of the time is spent, around 2 secs in initializing the VESA display.
I have analyzed the sequence of VESA initialization flow and I have identified that realmode_call under the function bios_run_on_x86() takes more time -- around 1.7 Sec,
realmode_call(addr + 0x0003, num_dev, 0xffff, 0x0000, 0xffff, 0x0, 0x0);
Do you have any idea why this is happening?
I tried removing the VIDEO configuration from u-boot, though the boot up is fast , the i915 driver from Linux is reporting an error -- 'i915 0000:00:02.0: Invalid ROM contents' I understand that the Linux kernel expects the underlying boot loader to setup some initialization which is missing in this case.
Do you know any methods by which I can speed up the video driver initialization phase in u-boot. Please note that I don't need video support during u-boot phase,I am not going to use any splash images.
Mit Freundlichen Grüßen VinothKumar +49 1798909072