Binman how to build using Rockchip BL32 binary as OP-TEE

[Simon Glass]

Hi Jonas,

On Mon, 4 Sept 2023 at 10:52, Jonas Karlman <jonas at kwiboo.se> wrote:
>
> Hi Massimo,
>
> On 2023-09-04 17:05, Massimo Pegorer wrote:
> > Hi,
> >
> > Is there any way for binman to package FIT with U-Boot TF-A and
> > OP-TEE, using bl32 binary provided by Rockchip as TEE?
> >
> > I've tried with TEE=/path/to/rkbin/bin/rk33/xxx_bl32_vX.YZ.bin, but
> > binman failed.
> >
> > In my poor understanding of Python code, it seems binman accepts only
> > ELF format or a binary format starting with optee_v1_header, but
> > binaries provided by Rockchip in rkbin repository do not have this
> > header.
>
> One way that I have used/tested before was to create a tee.elf version
> using something like:
>
> $ aarch64-linux-gnu-objcopy -B aarch64 -I binary -O elf64-littleaarch64
xxx_bl32_vX.YZ.bin bl32.o
> $ aarch64-linux-gnu-ld bl32.o -T tee.ld -o tee.elf
>
> tee.ld:
> ----
> ENTRY(_binary_bl32_bin_start);
>
> SECTIONS
> {
>         . = 0x08400000;
>         .data : {
>                 *(.data)
>         }
> }
> ----
>
> And then make with TEE=tee.elf, however keep in mind that U-Boot may not
> treat the memory region used by OP-TEE properly for aarch64.
>
> Regards,
> Jonas
>
> >
> > Thanks in advance for any hints!

Should we do something to support a 'flat' binary in the tee-os entry type?
For example, we could allow it if so long as a fixed load address is
provided? It might be a bit of a hack though.

Regards,
Simon