On 8/14/2023 12:59 PM, Denys Dmytriyenko wrote:
On Sat, Aug 05, 2023 at 11:39:47PM -0500, Ryan Eatmon via
lists.yoctoproject.org wrote:
The initramfs does not need grub-efi or the /boot directory since it
does not have to boot the system itself. So create a version of the
tiny-image that strips those out and follow the oe-core methodology for
initramfs.
So, kernel.bbclass has a default weak dependency from kernel-base to
kernel-image, which is meant to be broken/cleared if you don't need to
pull kernel images into a rootfs.
To simplify, it looked like this some time ago:
RDEPENDS:kernel-base ?= "kernel-image"
Well, these days it's ${KERNEL_PACKAGE_NAME}-base and
${KERNEL_PACKAGE_NAME}-image
So one can prevent pulling kernel images into rootfs:
https://git.openembedded.org/openembedded-core/tree/meta/conf/machine/include/qemu.inc#n19
But, this is a kernel variable that controls how kernel packages get
generated with their dependencies. You can modify it either in the kernel
recipe itself, ot globally in either <machine>.conf or <distro>.conf.
We also use the same mechanism to pull in kernel-devicetree package with
DTBs and other required FW images.
Unfortunately, that also means it cannot be adjusted on a per-image basis.
Hence, in the past we used to do exactly the same by removing /boot directory
for a initramfs image (you don't need to create a separate class though):
https://git.yoctoproject.org/meta-arago/tree/meta-arago-distro/recipes-bsp/netboot-initrd/netboot-initrd_0.0.1.bb?id=f9cf73fd8821af096fed7ad4d485af72c8ecc3ce
I thought I tried something like that... Maybe I had something else
wrong that prevented it from working. I'll try again.
Oh, and RDEPENDS was recently replaced with RRECOMMENDS:
https://git.openembedded.org/openembedded-core/tree/meta/classes-recipe/kernel.bbclass#n708
Supposedly, this should make the dependency even weaker and allow
breaking it inside image recipe with BAD_RECOMMENDATIONS, but my
quick testing didn't work for some reason...
Signed-off-by: Ryan Eatmon <[email protected]>
---
.../classes/remove-boot-dir.bbclass | 8 ++++++
.../images/tisdk-tiny-initramfs.bb | 26 +++++++++++++++++++
.../packagegroup-arago-initramfs.bb | 4 +++
3 files changed, 38 insertions(+)
create mode 100644 meta-arago-distro/classes/remove-boot-dir.bbclass
create mode 100644
meta-arago-distro/recipes-core/images/tisdk-tiny-initramfs.bb
create mode 100644
meta-arago-distro/recipes-core/packagegroups/packagegroup-arago-initramfs.bb
diff --git a/meta-arago-distro/classes/remove-boot-dir.bbclass
b/meta-arago-distro/classes/remove-boot-dir.bbclass
new file mode 100644
index 00000000..bd0c09fc
--- /dev/null
+++ b/meta-arago-distro/classes/remove-boot-dir.bbclass
@@ -0,0 +1,8 @@
+# Add a ROOTFS_POSTPROCESS_COMMAND that will remove some files from the
+# rootfs for initramfs images.
+
+ROOTFS_POSTPROCESS_COMMAND += "remove_boot_dir;"
+
+remove_boot_dir () {
+ rm -rf ${IMAGE_ROOTFS}/boot
+}
diff --git a/meta-arago-distro/recipes-core/images/tisdk-tiny-initramfs.bb
b/meta-arago-distro/recipes-core/images/tisdk-tiny-initramfs.bb
new file mode 100644
index 00000000..0bea8276
--- /dev/null
+++ b/meta-arago-distro/recipes-core/images/tisdk-tiny-initramfs.bb
@@ -0,0 +1,26 @@
+SUMMARY = "Arago TI SDK super minimal base image for initramfs"
+
+DESCRIPTION = "Image meant for basic boot of linux kernel. Intended as\
+ bare system, this image does not package the kernel in the\
+ standard /boot folder in rootfs. Instead, it provides a base\
+ rootfs allowing kernel to be deployed elsewhere\
+ (tftp/separate boot partition/jtag log etc..) and boot\
+ the image.\
+"
+
+LICENSE = "MIT"
+
+inherit core-image
+inherit remove-boot-dir
+
+IMAGE_FEATURES:remove = "package-management"
+
+INITRAMFS_FSTYPES = "cpio cpio.xz"
+INITRAMFS_MAXSIZE = "65536"
+IMAGE_OVERHEAD_FACTOR = "1"
+
+IMAGE_FSTYPES = "${INITRAMFS_FSTYPES}"
+
+PACKAGE_INSTALL = "packagegroup-arago-initramfs"
+
+export IMAGE_BASENAME = "tisdk-tiny-initramfs"
diff --git
a/meta-arago-distro/recipes-core/packagegroups/packagegroup-arago-initramfs.bb
b/meta-arago-distro/recipes-core/packagegroups/packagegroup-arago-initramfs.bb
new file mode 100644
index 00000000..380cc0e3
--- /dev/null
+++
b/meta-arago-distro/recipes-core/packagegroups/packagegroup-arago-initramfs.bb
@@ -0,0 +1,4 @@
+
+require recipes-core/packagegroups/packagegroup-core-boot.bb
+
+RDEPENDS:${PN}:remove = "grub-efi kernel"
--
2.17.1
--
Ryan Eatmon [email protected]
-----------------------------------------
Texas Instruments, Inc. - LCPD - MGTS
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