On 08/17/2015 10:43 AM, Alexey Brodkin wrote:
Hello,
I'm playing with OpenWRT for a new platform and have a question on
how OpenWRT handles KCONFIG kernel options.
For example I select KernelPackage/crypto-core in OpenWRT's menuconfig
then KCONFIG is populated with:
--8
CONFIG_CRYPTO=y
CONFIG_CRYPTO_HW=y
CONFIG_CRYPTO_BLKCIPHER
CONFIG_CRYPTO_ALGAPI
--8
From what I may see from grepping through OpenWRT that KCONFIG value
is only used to determine if those options are enabled in kernel configuration
but not for force selection of options in kernel.
They are mainly used for selecting the config options in the kernel. I
do not know how exactly it is done.
In other words if I want to get crypto core built I need to make sure first
that in my say target/linux/board/config-4.1 options mentioned above are
enabled. Is that observation correct?
no
I'm asking because my initial assumption was I need to provide a minimal
kernel configuration in target/linux/board/config-4.1 and then on
selection of kmods in OpenWRT's menuconfig missing config options
will be automatically added in kernel config.
Your initial assumption was correct. You should provide a minimal
target/linux/board/config-4.1 which selects all kernel options which
will be compiled into the main kernel image, it should not contain any
option selected as a module, everything you want to build as a module
should be defined in a OpenWrt kernel package and they it can be
selected optional.
But apparently no options are auto-enabled because I'm seeing that kind
of build failure if CONFIG_CRYPTO_BLKCIPHER is not explicitly set in my
kernel config:
--8
NOTICE: module 'xxx/openwrt/build_dir/target-yyy/linux-zzz/linux
-4.1.3/crypto/crypto_algapi.ko' is built-in.
ERROR: module 'xxx/openwrt/build_dir/target-yyy/linux-zzz/linux
-4.1.3/crypto/crypto_blkcipher.ko' is missing.
modules/crypto.mk:30: recipe for target 'xxx/openwrt/bin/axs10x
-uClibc/packages/base/kmod-crypto-core_4.1.3-1_axs10x.ipk' failed
make[3]: *** [xxx/openwrt/bin/axs10x
-uClibc/packages/base/kmod-crypto-core_4.1.3-1_axs10x.ipk] Error 1
--8
The kmod-crypto-core from KernelPackage/crypto-core should select the
CONFIG_CRYPTO_BLKCIPHER option.
Hauke
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