Re: [Buildroot] 2023.02 : pty_allocate: openpty: No such file or directory

From: Peter Korsgaard <peter@korsgaard.com>
To: Zvi Vered <veredz72@gmail.com>
Cc: buildroot@buildroot.org
Subject: Re: [Buildroot] 2023.02 : pty_allocate: openpty: No such file or directory
Date: Fri, 24 Mar 2023 07:36:58 +0100	[thread overview]
Message-ID: <877cv6psdx.fsf@dell.be.48ers.dk> (raw)
In-Reply-To: <CABRndgzV8hKy1pyRCNm+sgi_ePoHgYrS5h_4ca2bZd3E006nPQ@mail.gmail.com> (Zvi Vered's message of "Fri, 24 Mar 2023 06:30:28 +0300")

>>>>> "Zvi" == Zvi Vered <veredz72@gmail.com> writes:

Hello,

 > Hi Peter,
 > I did not know about an option to embed the rootfs as an initramfs.
 > The "custom way" is always plan B.
 > Can you please specify what I should modify in the .config of buildroot for
 > this purpose ?

If you configure Buildroot to build your Linux kernel as well, then you
will see a new option under filesystem images called "initial RAM
filesystem linked into linux kernel".

> Currently I extract rootfs.tar and then run the following script:
 > ------------------------------------------------------------------------------------------------------------
 > ./kernel/linux-xlnx/scripts/gen_initramfs_list.sh ../rootfs > initramfs_list
 > ./kernel/linux-xlnx/usr/gen_init_cpio initramfs_list > rootfs.cpio
 > gzip rootfs.cpio
 > ./u-boot/u-boot-xlnx/tools/mkimage -A arm64 -T ramdisk -C gzip -n
 > 'petalinux-user-image-plnx-zynqmp' -d rootfs.cpio.gz rootfs.cpio.gz.u-boot
 > -------------------------------------------------------------------------------------------------------------
 > This creates rootfs.cpio.gz.u-boot which is loaded via TFTP.

You presumably do this as a normal user, so file ownership will be wrong
and device nodes (like your /dev/null problem) cannot be correctly
created.

Even if you don't want to build a Linux kernel with Buildroot you can
replace those 4 steps with the cpio filesystem option in Buildroot,
E.G.:

 [*] cpio the root filesystem (for use as an initial RAM filesystem)
       cpio type (cpio the whole root filesystem)  --->
       Compression method (gzip)  --->
 [*]   Create U-Boot image of the root filesystem

-- 
Bye, Peter Korsgaard
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