[U-Boot] [PATCH 0/3] sunxi: Fix boot of Cubietruk and al.

[Siarhei Siamashka]

On Thu, Oct 19, 2017 at 11:26 AM, Maxime Ripard
<maxime.ripard at free-electrons.com> wrote:
> Hi,
>
> Most featureful boards, such as the Cubietruck, have been broken since
> the release 2017.09.
>
> This is due to a size increase of the binary that will trip us across
> the size we've been using in the u-boot-sunxi-with-spl.bin file.
>
> We would have two ways to work around it. The first one would be to
> just increase the offset of the environment. However, since it would
> break all the environments of our users and possibly the custom
> partition scheme that they would have created, it doesn't really seem
> like a smart move.
>
> Another one would be to start trimming down a bit our enabled options
> in order to reduce the size and to gain some extra space for users
> customisations. I've taken care some of the low hanging fruits, and we
> should probably take another go at it in the future (and add a size
> check in the image build somehow?)
>
> Maxime
>
> Maxime Ripard (3):
>   ARM: sunxi: Disable USB host options by default
>   ARM: sunxi: Disable FAT write by default
>   efi_loader: Do not enable it by default for sunxi
>
>  arch/arm/Kconfig       | 4 ----
>  lib/efi_loader/Kconfig | 2 +-
>  2 files changed, 1 insertion(+), 5 deletions(-)

We can first enable Thumb2 build by default for 32-bit sunxi boards
and this should fix Cubietruck problems.

$ cat .config | grep THUMB
CONFIG_HAS_THUMB2=y
# CONFIG_SYS_THUMB_BUILD is not set
CONFIG_SPL_SYS_THUMB_BUILD=y

As a test, enabling CONFIG_SYS_THUMB_BUILD=y in Cubietruck_defconfig
reduces the size of the resulting U-Boot binary.

== Before: ==

$ arm-linux-gnueabihf-size u-boot
   text       data        bss        dec        hex    filename
 489398      26492     249240     765130      bacca    u-boot.orig

== After: ==

$ arm-linux-gnueabihf-size u-boot
   text       data        bss        dec        hex    filename
 366314      26492     249232     642038      9cbf6    u-boot

-- 
Best regards,
Siarhei Siamashka