On Sun, Oct 17, 2010 at 08:23:57PM -0500, Scott Duplichan wrote: > ]> For coreboot+seabios, I get a power on to DOS boot time of around 2.7 > ]> seconds. This is with USB enabled and a 5400 rpm sata drive. While 2.7 > ]> seconds is good, there is probably room for improvement. I would like > ]> to see a bigger coreboot advantage over UEFI. All of these numbers are > ]> for AMD hardware with family 10h processors. > ] > ]Thanks. Can you post the debug output using SeaBIOS' > ]tools/readserial.py program? I'd be curious to see where the time is > ]spent. > ] > ]Also, try the SeaBIOS options CONFIG_THREAD_OPTIONROMS and > ]CONFIG_ATA_DMA. (The ATA DMA can be a little finicky though - fixing > ]it is on my todo list.) > > I am not sure how to get that script to run from windows. I get: > > $ python ../seabios-for-coreboot/tools/readserial.py com1 115200 > Traceback (most recent call last): > File "../seabios-for-coreboot/tools/readserial.py", line 129, in <module> > main() > File "../seabios-for-coreboot/tools/readserial.py", line 114, in main > import serial > ImportError: No module named serial
Thanks for the report. You need the pyserial package - see: http://pyserial.sourceforge.net/ I've updated the script to make this more descriptive. > But it hardly matters. I think coreboot is taking most of the time. For > example, I noticed a hesitation at: > "copying VGA ROM Image from %p to 0x%x, 0x%x bytes\n" It's best to let SeaBIOS run the rom - try setting CONFIG_VGA_ROM_RUN and CONFIG_PCI_ROM_RUN to off in coreboot. Also, set CONFIG_DRIVERS_PS2_KEYBOARD off as well. [...] > With these two changes, boot time is reduced by 650 ms. Now the boot > time is around 2.050 seconds. That is from power switch off (standby > power on) to DOS prompt. [...] > By the way, I tried your other suggestions and did not see much > of a difference. I do need to get an SSD drive because the > randomness in the rotating drive makes precise measurements > difficult. The DMA hardly matters for DOS where only a few KB > are read from disk. But it could be very important for OS booting, > where as much as hundreds of MB are read from disk using BIOS calls. Yeah - I found the SSD to be a big win on boot times - simply because it eliminated the spin-up delay. I also tried USB drives and a compact flash card with an ATA/SATA adapter, but all three exhibited "spin-up" delays. -Kevin -- coreboot mailing list: [email protected] http://www.coreboot.org/mailman/listinfo/coreboot
