[RFC PATCH v1] lib: rsa: introduce RSA_SOFTWARE_EXP_TINY

[Simon Glass]

Hi Igor,

On Fri, 16 Apr 2021 at 01:10, Igor Opaniuk <igor.opaniuk at foundries.io> wrote:
>
> From: Igor Opaniuk <igor.opaniuk at foundries.io>
>
> Introduce RSA_SOFTWARE_EXP_TINY Kconfig option, which does not require
> DM to be enabled. This can be handy on devices, where SPL + signed
> U-Boot FIT image setup is used, where it isn't possible to enable SPL_DM
> mainly due to SRAM size constraits.
>
> For example, on iMX8MM with this option enabled and SPL_DM disabled
> it's possible to save almost 11Kb:

That seems a lot...do you have OF_PLATDATA enabled?

>
> With RSA_SOFTWARE_EXP_TINY enabled:
> spl/u-boot-spl-nodtb.bin 99824
>
> Without:
> spl/u-boot-spl-nodtb.bin 111088
>
> Signed-off-by: Igor Opaniuk <igor.opaniuk at foundries.io>
> ---
>
>  lib/rsa/Kconfig      | 11 ++++++++++-
>  lib/rsa/rsa-verify.c |  8 ++++----
>  2 files changed, 14 insertions(+), 5 deletions(-)

Regards,
Simon