On Sun, Apr 19, 2009 at 8:38 AM, Kevin O'Connor <[email protected]> wrote: > I did some local optimizations and have some more info. > > I disabled keyboard init in coreboot-v2 - saves 400ms. > > I disabled ATA reset in SeaBIOS on first boot. > > I exit out of a CBFS search in SeaBIOS if the file signature is zero > (CBFS is zero padding instead of ff padding). >
You could also only read it once and save the devid and address of ROMs if there are any. > This brings the boot time on reset to 1.7 seconds (reset press to grub > launch - doesn't include 2.5 seconds at boot menu). Boot from powerup > takes a bit longer - 8.9s (7 seconds is for drive spinup). > > Another optimization I could make would be to reduce the 90ms it takes > to copy the vga rom from flash. Using 4 byte reads instead of 1 byte > reads will likely help. However, enabling an mtrr for the flash would > likely lead to the best results. We have been discussing this in another thread. The 4byte read will make the most improvement and the cache only helps a lot if the ROM is compressed. You are still bound by the width and speed of the ROM access. LPC/FWH is typically setup to be very slow. Marc -- http://marcjonesconsulting.com -- coreboot mailing list: [email protected] http://www.coreboot.org/mailman/listinfo/coreboot
