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gem5: initramfs works, obviously :-)

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Ciro Santilli 六四事件 法轮功
2019-01-22 00:00:00 +00:00
parent 63dd4c5d6f
commit 54ef7d52f9
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README.adoc
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@@ -2654,7 +2654,7 @@ It is also possible to compress that image with other options.
+
Buildroot forces that option when `BR2_TARGET_ROOTFS_CPIO=y` is given
https://unix.stackexchange.com/questions/89923/how-does-linux-load-the-initrd-image asks how the mechanism works in more detail.
TODO: how does the bootloader inform the kernel where to find initrd? https://unix.stackexchange.com/questions/89923/how-does-linux-load-the-initrd-image
=== initrd in desktop distros
@@ -2674,8 +2674,6 @@ Related: https://stackoverflow.com/questions/6405083/initrd-and-booting-the-linu
=== initramfs
TODO: broken when we started building the Linux manually with `./build-linux` instead of Buildroot. Was working before, see e.g. 56738a1c70e50bf7b6d5fbe02372c5d277a8286f.
initramfs is just like <<initrd>>, but you also glue the image directly to the kernel image itself using the kernel's build system.
Try it out with:
@@ -2719,9 +2717,17 @@ http://nairobi-embedded.org/initramfs_tutorial.html shows a full manual setup.
TODO we were not able to get it working yet: https://stackoverflow.com/questions/49261801/how-to-boot-the-linux-kernel-with-initrd-or-initramfs-with-gem5
This would require gem5 to load the CPIO into memory, just like QEMU, which it does not seem to support. It should not be hard to implement however.
This would require gem5 to load the CPIO into memory, just like QEMU. Grepping `initrd` shows some ARM hits under:
initramfs might just work however, TODO test it out.
....
src/arch/arm/linux/atag.hh
....
but they are commented out.
Initramfs just works however, since gem5 does not need to do anything special there, it just dumps the kernel into memory as usual, it just happens to transparently contain a CPIO disk image attached.
We just have to pass a dummy disk image as of gem5 7fa4c946386e7207ad5859e8ade0bbfc14000d91 since the scripts don't handle a missing `--disk-image` well, much like is currently done for <<baremetal>>.
== Device tree