[U-Boot] U-Boot SPL/TPL build system

[Simon Glass]

Hi Kever,

On 25 October 2017 at 19:37, Kever Yang <kever.yang at rock-chips.com> wrote:
>
> Hi Simon,Philipp,
>
>     I still confuse about how the SPL/TPL build system works, including what Kconfig will be used,
> and how to write the Makefile suppose to be correct.
>
>     I'm trying to enable the SPL/TPL for rk3328, I want to remove all the unnecessary module because the
> ram size is very limited, but the instruction size in aarch64 is lager.
>     For example,
> - for debug output, I only want to enable the DEBUG_UART, but not SERIAL_DM and SERAIL_SUPPORT.
>     If disable the SPL_SERIAL_DM and SERIAL_SUPPORT, it can not pass the build.

At least one board does this - can you please share the tree and I can look?

> - I don't need interrupt, which vector table need a lot size in aarch64,

Can you leave it out?

> - I don't need panic, this realy dose not help me much, I don't want to enable sysreset in TPL;
>
>
> For the rk3368, I get overflow when I use aarch64 compile tool from ubuntu 14.04:
> aarch64-linux-gnu-ld.bfd: u-boot-tpl section `.u_boot_list' will not fit in region `.sram'
> aarch64-linux-gnu-ld.bfd: region `.sram' overflowed by 224 bytes
> If I use the gcc-linaro-6.3.1-2017.05-x86_64_aarch64-linux-gnu, it won't overflow.

The newer compiler might be better, or might fix a bug.

>
> Thanks,
> - Kever
>

Regards,
Simon