[linux-yocto] 回复： about beaglebone-yocto bitbake core-image-rt

[Bruce Ashfield]

On 09/27/2018 11:24 PM, 劉家祿 wrote:
> cd meta-yocto-bsp/recipes-kernel/linux/
> cp linux-yocto_4.18.bbappend linux-yocto-rt_4.18.bbappend
> 
> it works now.

It only works to build due to the line:

COMPATIBLE_MACHINE_beaglebone-yocto = "beaglebone-yocto"

But it may not actually be building the proper -rt kernel,
since that same bbappend sets SRCREVs that are not valid
for the preempt-rt branches.

Also, it wouldn't work if there wasn't already a preempt-rt
BSP description for that board (but in this case, there is
one).

Bruce


> 
> ------------------ 原始邮件 ------------------
> *发件人:* "我自己的邮箱"<1056612358 at qq.com>;
> *发送时间:* 2018年9月28日(星期五) 中午11:09
> *收件人:* "Bruce 
> Ashfield"<bruce.ashfield at windriver.com>;"linux-yocto"<linux-yocto at yoctoproject.org>;
> *主题:* 回复： [linux-yocto] about beaglebone-yocto bitbake core-image-rt
> 
> in file:
>               meta-yocto-bsp/recipes-kernel/linux/linux-yocto_4.18.bbappend
> there is line:
>               COMPATIBLE_MACHINE_beaglebone-yocto = "beaglebone-yocto"
> 
> was it for add COMPATIBLE_MACHINE?
> 
> ------------------ 原始邮件 ------------------
> *发件人:* "Bruce Ashfield"<bruce.ashfield at windriver.com>;
> *发送时间:* 2018年9月27日(星期四) 晚上9:27
> *收件人:* "劉家祿"<1056612358 at qq.com>;"linux-yocto"<linux- 
> yocto at yoctoproject.org>;
> *主题:* Re: [linux-yocto] about beaglebone-yocto bitbake core-image-rt
> 
> On 09/27/2018 02:15 AM, 劉家祿 wrote:
>  > $ git clone git://git.yoctoproject.org/poky
>  > $ cd poky
>  > $ . ./oe-init-build-env build-bbb
>  >
>  > edit conf/local.conf to set MACHINE ??= "beaglebone-yocto"
>  >
>  > $ echo "PREFERRED_PROVIDER_virtual/kernel = \"linux-yocto-rt\"" >>
>  > conf/local.conf
>  > $ bitbake -v core-image-rt
>  >
>  > got errors:
>  >
>  > Loading cache...done.
>  > Loaded 1260 entries from dependency cache.
>  > NOTE: Resolving any missing task queue dependencies
>  > NOTE: selecting pseudo-native to satisfy virtual/fakeroot-native due to
>  > PREFERRED_PROVIDERS
>  > ERROR: Nothing PROVIDES 'linux-yocto-rt' (but
>  > 
> /home/jaloo/backup/yocto/src/poky/meta/recipes-rt/images/core-image-rt.bb DEPENDS 
> 
>  > on or otherwise requires it)
>  > linux-yocto-rt was skipped: incompatible with machine beaglebone-yocto
>  > (not in COMPATIBLE_MACHINE)
>  > linux-yocto-rt was skipped: incompatible with machine beaglebone-yocto
>  > (not in COMPATIBLE_MACHINE)
>  > NOTE: Target 'linux-yocto-rt' is unbuildable, removing...
>  > Missing or unbuildable dependency chain was: ['linux-yocto-rt']
>  > NOTE: Target 'core-image-rt' is unbuildable, removing...
>  > Missing or unbuildable dependency chain was: ['core-image-rt',
>  > 'linux-yocto-rt']
>  > ERROR: Required build target 'core-image-rt' has no buildable providers.
>  > Missing or unbuildable dependency chain was: ['core-image-rt',
>  > 'linux-yocto-rt']
> 
> The problem is just what they error message is trying to say.
> There's no declared machine compatibility between that board
> and the linux-yocto-rt recipe.
> 
> You could create a bbappend that contained both a BSP
> definition and that sets the compatibility. But I can't
> say if it would, or wouldn't have runtime issues.
> 
> i.e. you need to append beaglbone-yocto to the COMPATIBLE_MACHINE
> variable.
> 
> You also need a BSP definition for the -rt kernel, but at
> a glance, it looks like there's already one in the kernel-cache,
> so you should get a valid configuration.
> 
> Bruce
> 
>  >
>  > Summary: There were 2 ERROR messages shown, returning a non-zero exit 
> code.
>  >
>  >
>  >
>  >
>  >