And here is example how we're using it:

https://github.com/webosose/meta-webosose/blob/master/meta-webos-raspberrypi/recipes-bsp/u-boot/u-boot-env.bb

To make it compatible with raspberrypi3 and raspberrypi3-64, I've updated
it a bit to select correct IMAGETYPE and BOOTCMD based on the environment:

do_compile() {
    sed -e 's/@@KERNEL_IMAGETYPE@@/${KERNEL_IMAGETYPE}/' \
        -e 's/@@KERNEL_BOOTCMD@@/${KERNEL_BOOTCMD}/' \
        "${WORKDIR}/uboot-env.txt.in" > "${WORKDIR}/uboot-env.txt"
    uboot-mkenvimage -s 16384 -o uboot.env ${WORKDIR}/uboot-env.txt
}


On Mon, Apr 30, 2018 at 3:23 PM, Martin Jansa <martin.jansa@gmail.com>
wrote:

> u-boot-mkimage already builds mkenvimage, you just need to install it in
> do_install:
>
>     install -m 0755 tools/mkenvimage ${D}${bindir}/uboot-mkenvimage
>     ln -sf uboot-mkenvimage ${D}${bindir}/mkenvimage
>
> This is what we have in recipes-bsp/u-boot/u-boot-mkimage_%.bbappend and
> it works fine.
>
> On Mon, Apr 30, 2018 at 8:50 AM, Martin Hundebøll <mnhu@prevas.dk> wrote:
>
>> Hi Lukasz,
>>
>> On 2018-04-27 16:51, Lukasz Majewski wrote:
>>
>>> This commit provides the ability to generate u-boot environment(s) as
>>> images, which afterwards can be used to produce image (with wic) for
>>> flashing (eMMC or SPI-NOR).
>>>
>>> This change removes the need to run "env default" during production
>>> phase,
>>> as proper environment (including redundant one) is already stored on
>>> persistent memory (the CRC is also correct).
>>>
>>
>> I think we should create a separate recipe to install the native
>> mkenvimage binary (e.g. u-boot-mkenvimage_%.bb) or update
>> u-boot-mkimage_%.bb install it.
>>
>> Then a new recipe to create the environment images can depend on
>> u-boot-mkenvimage-native.
>>
>> Also note the recently added upstream support for external environment
>> definitions:
>> http://git.denx.de/?p=u-boot.git;a=commit;h=f3d8f7dd73ac5dde
>> 258eb786d4a01869395b56d7
>>
>> For our usecase we need the ability to generate environment images in
>> yocto from such external definitions.
>>
>> // Martin
>>
>>
>>> Signed-off-by: Lukasz Majewski <lukma@denx.de>
>>>
>>> ---
>>> This patch depends on "u-boot: Upgrade to 2018.03 release"
>>> https://patchwork.openembedded.org/patch/149998/
>>> ---
>>>   meta/recipes-bsp/u-boot/u-boot.inc | 35 ++++++++++++++++++++++++++++++
>>> +++++
>>>   1 file changed, 35 insertions(+)
>>>
>>> diff --git a/meta/recipes-bsp/u-boot/u-boot.inc
>>> b/meta/recipes-bsp/u-boot/u-boot.inc
>>> index c2bcf99840..2796e503cf 100644
>>> --- a/meta/recipes-bsp/u-boot/u-boot.inc
>>> +++ b/meta/recipes-bsp/u-boot/u-boot.inc
>>> @@ -305,3 +305,38 @@ do_deploy () {
>>>   }
>>>     addtask deploy before do_build after do_compile
>>> +
>>> +# Create new rules to extract default envs
>>> +UBOOT_ENVS_DEFAULT ?= "uboot-envs-default"
>>> +DEFAULT_ENVS ?= "u-boot-env-default.txt"
>>> +DEFAULT_ENVS_SIZE ?= "65536"
>>> +
>>> +# Generate default environment
>>> +do_gen_default_envs[doc] = "Generate image with default U-Boot
>>> environment(s)"
>>> +do_gen_default_envs () {
>>> +       ${B}/source/scripts/get_default_envs.sh ${B} >
>>> ${B}/${DEFAULT_ENVS}
>>> +
>>> +       # Generate env image
>>> +       ${B}/tools/mkenvimage -s ${DEFAULT_ENVS_SIZE} -o
>>> ${B}/${UBOOT_ENVS_DEFAULT} ${B}/${DEFAULT_ENVS}
>>> +
>>> +       # Generate redundant env image
>>> +       ${B}/tools/mkenvimage -r -s ${DEFAULT_ENVS_SIZE} -o
>>> ${B}/${UBOOT_ENVS_DEFAULT}_r ${B}/${DEFAULT_ENVS}
>>> +
>>> +       rm ${B}/${DEFAULT_ENVS}
>>> +}
>>> +
>>> +addtask gen_default_envs before do_deploy_default_envs after do_compile
>>> +
>>> +# Deploy default environment
>>> +do_deploy_default_envs[doc] = "Copy images with default U-Boot
>>> environment to deployment directory"
>>> +do_deploy_default_envs () {
>>> +       install -d ${DEPLOYDIR}
>>> +
>>> +       install ${B}/${UBOOT_ENVS_DEFAULT} ${DEPLOYDIR}/${UBOOT_ENVS_DEFA
>>> ULT}
>>> +       install ${B}/${UBOOT_ENVS_DEFAULT}_r
>>> ${DEPLOYDIR}/${UBOOT_ENVS_DEFAULT}_r
>>> +
>>> +       rm ${B}/${UBOOT_ENVS_DEFAULT}
>>> +       rm ${B}/${UBOOT_ENVS_DEFAULT}_r
>>> +}
>>> +
>>> +addtask deploy_default_envs before do_deploy after do_gen_default_envs
>>>
>>> --
>> _______________________________________________
>> Openembedded-core mailing list
>> Openembedded-core@lists.openembedded.org
>> http://lists.openembedded.org/mailman/listinfo/openembedded-core
>>
>
>