On Mon, Apr 2, 2018 at 3:28 AM, Simon Glass <s...@google.com> wrote: > Hi Andre, > > On 2 April 2018 at 09:43, André Przywara <andre.przyw...@arm.com> wrote: >> Hi, >> >> On 01/04/18 14:19, Tom Rini wrote: >>> On Tue, Mar 27, 2018 at 11:34:19PM +0530, Jagan Teki wrote: >>>> On Mon, Sep 4, 2017 at 9:57 PM, <s...@google.com> wrote: >>>>> Hi Tom, >>>>> >>>>> On 7 August 2017 at 09:39, Tom Rini <tr...@konsulko.com> wrote: >>>>>> On Sat, Aug 05, 2017 at 03:45:53PM -0600, Simon Glass wrote: >>>>>> >>>>>>> The CONFIG_BLK conversion involves quite invasive changes in the U-Boot >>>>>>> code, with #ifdefs and different code paths. We should try to move over >>>>>>> to >>>>>>> this soon so we can drop the old code. >>>> >>>> I hope this will applicable to SPL too? >>>> >>>> If so, we are having SPL size issues with few Allwinner families, if >>>> enable SPL_DM any suggestions? >>> >>> How close, and have you looked at the u-boot-spl.map to see what you can >>> maybe trim? Or areas to look at reducing in code complexity? >> >> The Boot ROM limit for all Allwinner SoCs known so far is 32KB. The A64 >> SPL (AArch64) stands at ~31KB at the moment. Yes, we went over the map >> and picked most low hanging fruits already. >> So far we discussed several mitigations, but mostly to cover the >> "natural" SPL code size grow over time: >> 1) The AArch64 exception vectors take 1KB, plus an unnecessary ~1.6KB of >> padding (for a 2KB architectural alignment). Given that the vectors are >> used only for debugging purposes, we could scrap them entirely or >> construct them on the fly in some other SRAM. So would free about 2.5KB, >> ideally. Lowest hanging fruit so far. >> 2) We can compile the SPL in AArch32 mode, which can use the Thumb2 >> encoding. This reduces the size significantly, to about 20KB. The >> disadvantage is using a second cross-compiler or even a additional >> cross-compiler for native builds, complicating the build process. >> I maintain a branch for enabling FEL booting here [1], which provides >> two _defconfigs (one 32-bit for SPL, one 64-bit for U-Boot proper). >> There are no technical disadvantages in running the SPL in 32-bit, so >> this is mostly a build issue. > > FYI 32-bit tegra compiles SPL with ARMv4T and U-Boot proper with > ARMv7. It should be fairly easy to do,
ARMv4 and ARMv7 are both 32 bit though, as opposed to 32 and 64 bit in the case of Allwinner A64 _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de https://lists.denx.de/listinfo/u-boot
