From mboxrd@z Thu Jan 1 00:00:00 1970 From: Adam Ford Date: Thu, 4 Mar 2021 07:46:18 -0600 Subject: [RFC PATCH u-boot 00/12] U-Boot LTO (Sandbox + ARM Nokia RX-51) In-Reply-To: <20210304114327.357167d8@nic.cz> References: <20210303041211.26945-1-marek.behun@nic.cz> <20210303161159.GF1310@bill-the-cat> <20210303174157.280e7179@nic.cz> <20210303213605.GR1310@bill-the-cat> <20210304114327.357167d8@nic.cz> Message-ID: List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: u-boot@lists.denx.de On Thu, Mar 4, 2021 at 4:43 AM Marek Behun wrote: > > On Wed, 3 Mar 2021 16:36:05 -0500 > Tom Rini 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. I don't think we should enable LTO by default for all boards yet. adam > > Marek