Hi Igor,
On Wed, 5 May 2021 at 06:58, Igor Opaniuk igor.opaniuk@foundries.io wrote:
Hi Simon,
On Thu, Apr 29, 2021 at 7:10 PM Simon Glass sjg@chromium.org wrote:
Hi Igor,
On Fri, 16 Apr 2021 at 01:10, Igor Opaniuk igor.opaniuk@foundries.io wrote:
From: Igor Opaniuk igor.opaniuk@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?
Nope, it's not enabled.
I think you should look at that first. It is likely to give a much larger benefit.
I've managed to get these numbers when experimenting with NXP U-Boot fork, which is based on 2020.04.
I also checked a while ago iMX6ULL mainline U-Boot with this patch, and size decrease was around 4-5 Kb, which basically is also not bad (considering 64Kb SPL size limitation for this SoC).
OK I see, but if we did this with every subsystem won't we end up with chaos? There will be cases where driver model is impossible, but with 64KB (which I assume you mean) I would hope that we could avoid it.
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@foundries.io
lib/rsa/Kconfig | 11 ++++++++++- lib/rsa/rsa-verify.c | 8 ++++---- 2 files changed, 14 insertions(+), 5 deletions(-)
Regards, Simon