Dear coreboot folks,
Am Donnerstag, den 24.04.2014, 23:39 +0200 schrieb Paul Menzel:
in #coreboot on <irc.freenode.net> Stefan mentioned that link time optimization (LTO) [1] might yield some speed improvements for coreboot as the resulting firmware image might be smaller and therefore it takes less time to read it from flash.
As LTO has been greatly improved in GCC 4.9.0 and is all over the news, has somebody already experimented with LTO or created patches or tools for testing?
Is somebody able to share conclusions already? That’d be very interesting.
looking further in April and May 2011 Scott Duplichan even sent a patch to add an option to enable LTO [2][3], but unfortunately it was not submitted.
Back then on AMD Persimmon with SeaBIOS as payload the boot time was reduced from 690 ms to 640 ms. (Fun fact: UEFI firmware took 10 s on that board.)
Thanks,
Paul
[1] http://gcc.gnu.org/onlinedocs/gcc/Optimize-Options.html (search for `lto`)
[2] http://www.coreboot.org/pipermail/coreboot/2011-April/064859.html [3] http://www.coreboot.org/pipermail/coreboot/2011-May/064874.html