On Mon, Apr 2, 2018 at 3:56 AM, Simon Glass sjg@chromium.org wrote:
Hi Peter,
On 2 April 2018 at 10:45, Peter Robinson pbrobinson@gmail.com wrote:
On Mon, Apr 2, 2018 at 3:28 AM, Simon Glass sjg@google.com wrote:
Hi Andre,
On 2 April 2018 at 09:43, André Przywara andre.przywara@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, sjg@google.com wrote: > Hi Tom, > > On 7 August 2017 at 09:39, Tom Rini trini@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:
- 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
Yes, but that is just a matter of compiler or compiler flags. My point was we should be able to use different build for each without too much work.
It's a lot more work for the way most distros build u-boot, but TBH the sooner I don't need to the better ;-)