On Thu, 4 Mar 2021 09:07:33 -0600 Adam Ford <aford...@gmail.com> wrote:
> On Thu, Mar 4, 2021 at 8:58 AM Tom Rini <tr...@konsulko.com> wrote: > > > > On Thu, Mar 04, 2021 at 07:46:18AM -0600, Adam Ford wrote: > > > On Thu, Mar 4, 2021 at 4:43 AM Marek Behun <marek.be...@nic.cz> wrote: > > > > > > > > On Wed, 3 Mar 2021 16:36:05 -0500 > > > > Tom Rini <tr...@konsulko.com> wrote: > > > > > > > > > So, as I start testing things locally with two additional changes (1. > > > > > LTO by default 2. No ffunction/data-sections with LTO) we see: > > > > > https://gist.github.com/trini/350ab850c42293563228b8d68a1bb89a > > > > > as the detailed size reduction. This also shows that with LTO we want > > > > > to turn off -ffunction-sections/etc as it's not useful now. > > > > > > > > Tom, I have pushed another version to github PR to trigger CI, and am > > > > still working on clang. You can look at the github PR if you want to > > > > try yourself. I have also added patch that disables > > > > -ffunction-section/fdata-section on arm. > > > > > > > > After I manage to make it all work in CI I will send v2 to mailing > > > > list. > > > > > > I tested this with the imx6q_logic board. I only tested the U-Boot > > > portion, but it appeared to work and it booted the kernel. The U-Boot > > > size reduced -7182 bytes (about 3% smaller). > > > > > > I haven't been able to successfully boot the OMAP3 boards I have yet. > > > I'm still looking into this. > > > > It boots (and pytest runs) on my Beagleboard xM, fwiw. > > Interesting. with LTO enabled, the DRAM reports 7.2 GB and hangs. > Without LTO, U-Boot boots fine. > > LTO: > OMAP3630/3730-GP ES1.2, CPU-OPP2, L3-200MHz, Max CPU Clock 1 GHz > Model: LogicPD Zoom DM3730 Torpedo + Wireless Development Kit > Logic DM37x/OMAP35x reference board + LPDDR/NAND > DRAM: 7.2 GiB > <hang> > > Without LTO: > OMAP3630/3730-GP ES1.2, CPU-OPP2, L3-200MHz, Max CPU Clock 1 GHz > Model: LogicPD Zoom DM3730 Torpedo + Wireless Development Kit > Logic DM37x/OMAP35x reference board + LPDDR/NAND > DRAM: 256 MiB > NAND: 512 MiB > MMC: OMAP SD/MMC: 0 > Loading Environment from NAND... OK > OMAP die ID: 619e00029ff800000168300f1502501f > Net: smc911x-0 > Hit any key to stop autoboot: 0 > OMAP Logic # > > adam > > > > -- > > Tom Tom, I think this means it would take some time to make it stable enough to enable it by default on all ARM boards. But I would really like to make it work ASAP at least for Nokia N900, because otherwise my `mtd` patches make the binary ~200 bytes too big for Nokia N900 and CI fails. Or would you be willing to accept `mtd` patches even with CI failing? Marek
