[yocto] Warning: unable to open an initial console

[Gerard van den Bosch]

Hello Ayoub,

Thank you very much.

Your script creates the /dev/console and the /dev/null in my rootfs and now
I keep getting console data.

Cheers,
Gerard

On Fri, May 26, 2017 at 10:35 PM, Ayoub Zaki <ayoub.zaki at embexus.com> wrote:

> Hi Gerard,
>
> indeed your Kernel it's quite outdated.
>
> you can try to add a recipe like that in your image :
>
> SUMMARY = "basic initramfs image init script"
> LICENSE = "MIT"
> LIC_FILES_CHKSUM = "file://${COREBASE}/meta/COPYING.MIT;md5=
> 3da9cfbcb788c80a0384361b4de20420"
> SRC_URI = "file://init-boot.sh"
>
>
> S = "${WORKDIR}"
>
> do_install() {
>         install -d ${D}${base_sbindir}
>         install -m 0755 ${WORKDIR}/init-boot.sh ${D}${base_sbindir}/init
> }
>
> do_install_append() {
>         install -d ${D}/dev
>         mknod -m 622 ${D}/dev/console c 5 1
>         mknod -m 666 ${D}/dev/null c 1 3
> }
>
> inherit allarch
>
> FILES_${PN} += "/dev /sbin/init "
>
>
> Regards,
>
> Ayoub
>
>
>
> On 26.05.2017 16:27, Gerard van den Bosch wrote:
>
> Hello Ayoub,
>
> The kernel is quite old 2.6.20 and this variable is not available in the
> config.
> On the internet I saw this is only introduced with kernel version 2.6.32.
>
> Cheers,
> Gerard
>
> On Fri, May 26, 2017 at 10:20 PM, Ayoub Zaki <ayoub.zaki at embexus.com>
> wrote:
>
>> Hi Gerard,
>>
>> did you try to set CONFIG_DEVTMPFS=y in your Kernel config ?
>>
>> Cheers
>>
>> On 26.05.2017 15:52, Gerard van den Bosch wrote:
>>
>> Hello Andrea,
>>
>> I have tried to add the line to my machine config:
>> IMAGE_DEVICE_TABLES = "files/device_table-minimal.txt"
>>
>> But this didn't help, then I looked a bit further and also tried to set
>> the following:
>>
>> USE_DEVFS="0"
>> VIRTUAL_RUNTIME_dev_manager = "mdev"
>>
>> Unfortunately this doesn't seem to change anything.
>>
>> Cheers,
>> Gerard
>>
>> On Fri, May 26, 2017 at 7:27 PM, Andrea Adami <andrea.adami at gmail.com>
>> wrote:
>>
>>> On Fri, May 26, 2017 at 1:05 PM, Gerard van den Bosch
>>> <gvandenbosch at gmail.com> wrote:
>>> > Hello,
>>> >
>>> > I have build my vendor custom kernel 2.6.20 with yocto daisy.
>>> > Daisy is used because seems to be last release supporting this old
>>> kernel.
>>> >
>>> > I tried building core-image-minimal and core-image-base.
>>> >
>>> > The kernel boots and the rootfs is mounted but then I get:
>>> >
>>> > "Warning: unable to open an initial console."
>>> >
>>> >
>>> > I found on the internet this is because "/dev/console" doesn't exists.
>>> > The dev folder in my generated rootfs is empty.
>>> >
>>> > On internet found can do the following commands:
>>> > "mknod -m 600 /dev/console c 5 1 "
>>> > "mknod -m 666 /dev/null c 1 3"
>>> >
>>> > But if this is the problem how do I add this to my recipe?
>>> > Or is there a proper way to populate this devices?
>>> >
>>> > Cheers,
>>> > Gerard
>>> >
>>> > --
>>> > _______________________________________________
>>> > yocto mailing list
>>> > yocto at yoctoproject.org
>>> > https://lists.yoctoproject.org/listinfo/yocto
>>> >
>>>
>>> Hello Gerard,
>>>
>>> if your old kernel lacks devtmpfs you need a "device table".
>>> You need to set at least
>>> IMAGE_DEVICE_TABLES = "files/device_table-minimal.txt"
>>>
>>> This is a default set in image.bbclass before and after daisy...dunno
>>> what's happened with this release.
>>>
>>> Cheers
>>> Andrea
>>>
>>
>>
>>
>>
>> --
>>
>> Ayoub Zaki
>> ayoub.zaki at embexus.com
>> Mobile: +49(0)176-62901545 <+49%20176%2062901545>https://embexus.com
>>
>>
>
> --
>
> Ayoub Zaki
> ayoub.zaki at embexus.com
> Mobile: +49(0)176-62901545 <+49%20176%2062901545>https://embexus.com
>
>
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