upstream u-boot with additional patches for our devices/boards: https://lists.denx.de/pipermail/u-boot/2017-March/282789.html (AXP crashes) ; Gbit ethernet patch for some LIME2 revisions ; with SPI flash support
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u-boot/lib/rsa/Kconfig

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config RSA
bool "Use RSA Library"
select RSA_FREESCALE_EXP if FSL_CAAM
select RSA_SOFTWARE_EXP if !RSA_FREESCALE_EXP
help
RSA support. This enables the RSA algorithm used for FIT image
verification in U-Boot.
See doc/uImage.FIT/signature.txt for more details.
The Modular Exponentiation algorithm in RSA is implemented using
driver model. So CONFIG_DM needs to be enabled by default for this
library to function.
The signing part is build into mkimage regardless of this
option. The software based modular exponentiation is built into
mkimage irrespective of this option.
config SPL_RSA
bool "Use RSA Library within SPL"
depends on RSA
if RSA
config RSA_SOFTWARE_EXP
bool "Enable driver for RSA Modular Exponentiation in software"
depends on DM && RSA
help
Enables driver for modular exponentiation in software. This is a RSA
algorithm used in FIT image verification. It required RSA Key as
input.
See doc/uImage.FIT/signature.txt for more details.
config RSA_FREESCALE_EXP
bool "Enable RSA Modular Exponentiation with FSL crypto accelerator"
depends on DM && RSA && FSL_CAAM
help
Enables driver for RSA modular exponentiation using Freescale cryptographic
accelerator - CAAM.
endif