On Sat, Jul 1, 2023 at 1:40 PM Mario Marietto <marietto2...@gmail.com> wrote: > > Excuse me. The problem is not the kernel version that I'm running,but how to > use the unverified u-boot created by virtual open systems to chainload the > kernel of whatever used to boot one recent ISO image created by hexdump0815. > Because it contains the code to put the chromebook in hypervisor mode. > Without that special u-boot version,I can for sure install one ISO image of > hexdump0815 (I've chosen jammy as an example,but hexdump0815 created some > more updated isos),but KVM will not be enabled.
You'll note I didn't comment on the U-Boot piece, but my point still remains, that KVM for a 32 bit Arm host was removed in the 5.7 kernel upstream, so even when you sort out the other problem you still won't have virt due to the kernel. > On Sat, Jul 1, 2023 at 2:34 PM Peter Robinson <pbrobin...@gmail.com> wrote: >> >> On Sat, Jul 1, 2023 at 1:25 PM Mario Marietto <marietto2...@gmail.com> wrote: >> > >> > Hello. >> > >> > I would like to enable KVM virtualization on my old ARM Chromebook >> > laptop,based on the Exynos5250 arm 32 bit cpu aka snow,model xe303c12. >> >> Upstream Linux kernel dropped support for running virt on 32 bit hosts >> (you can still run a 32 bit guest on a 64 bit host) in the upstream >> linux kernel with the 5.7 release (May 31st, 2020) so you'll probably >> have to run a 5.4.x LTS kernel rather than 5.18.x (not sure why you >> chose that one) at the very least. >> >> > The first thing I did has been to dd the image below directly on the sd >> > card : >> > >> > https://github.com/hexdump0815/imagebuilder/releases/download/220619-01/chromebook_snow-armv7l-jammy.img.gz >> > >> > and it worked like a charm,but kvm was disabled. So,I have started to look >> > for a good documentation to understand how to enable kvm and I found this : >> > >> > http://www.virtualopensystems.com/en/solutions/guides/kvm-on-chromebook/ >> > >> > I've followed all the instructions and it worked,but only with Ubuntu 13.04 >> > and 14.04. More upgraded ubuntu versions give a lot of problems and they >> > don't work. >> > >> > So,I've thought about a fresh idea. What about to install the virtual open >> > systems "non-verified u-boot" on the first partition like explained in the >> > tutorial,and,instead of starting another u-boot after the original,can I >> > chain grub with the kernel installed for example by the ubuntu jammy iso >> > image created by "hexdump0815" ? To be honest I'm not sure if hexdump0815 >> > used grub,but I will explain this later. >> > >> > Anyway,I've got the idea by reading here : >> > >> > https://unix.stackexchange.com/questions/599141/how-to-install-grub-bootloader-as-second-stage-bootloader >> > So,now,I'm going to explain what's the content of the partitions on my >> > Frankenstein sd card. >> > >> > 1) /dev/sdh1 = unknown = 16 MB. I've created this partition by doing : >> > >> > $ sudo dd if=nv_uboot-snow.kpart of=/dev/sdh1 >> > >> > Where I've got the file nv_uboot-snow.kpart ? From here : >> > >> > http://www.virtualopensystems.com/downloads/guides/kvm_on_chromebook/nv_u-boot-snow.kpart >> > >> > 2) /dev/sdh2 = unknown = 16 MB. This partition has been created by >> > executing the following >> > >> > script : >> > >> > $ sudo ./scripts/sdcard.sh /dev/sdh >> > >> > 3) /dev/sdh3 = ext2 BOOT. >> > >> > Inside the partition /dev/sdh3 I have copied the following files and >> > folders (taken >> > from the hexdump0815 "chromebook_snow-armv7l-jammy.img.gz" file : >> > >> > a) dtb-5.18.1-stb-cbe+ = directory >> > b) extlinux = directory >> > c) extra = directory >> > >> > d) config.5.18.1-stb-cbe+ : file >> > e) initrd.img-5.18.1-stb-cbe+ : file >> > f) System.map-5.18.1-stb-cbe+ : file >> > g) vmlinux.kpart-5.18.1-stb-cbe+ : file >> > h) zImage-5.18.1-stb.cbe+ : file >> > >> > Inside the directory "dtb-5.18.1-stb-cbe+" there are the following files : >> > >> > a) exynos5250-snow.dtb >> > b) exynos5250-snow-rev5.dtb >> > c) exynos5250-spring.dtb >> > >> > Inside the directory "extlinux",there is the following file : >> > >> > a) extlinux.conf : that has the following content : >> > >> > TIMEOUT 30 >> > >> > DEFAULT linux-snow-rev4 >> > >> > MENU TITLE snow chromebook boot options >> > >> > # rev4 snow chromebook >> > LABEL linux-snow-rev4 >> > MENU LABEL linux rev4 snow >> > LINUX ../zImage-5.18.1-stb-cbe+ >> > INITRD ../initrd.img-5.18.1-stb-cbe+ >> > FDT ../dtb-5.18.1-stb-cbe+/exynos5250-snow.dtb >> > APPEND console=tty1 root=LABEL=rootpart ro rootwait net.ifnames=0 >> > ipv6.disable=1 fsck.repair=yes noresume >> > >> > # rev5 snow chromebook >> > LABEL linux-snow-rev5 >> > MENU LABEL linux rev5 snow >> > LINUX ../zImage-5.18.1-stb-cbe+ >> > INITRD ../initrd.img-5.18.1-stb-cbe+ >> > FDT ../dtb-5.18.1-stb-cbe+/exynos5250-snow-rev5.dtb >> > APPEND console=tty1 root=LABEL=rootpart ro rootwait net.ifnames=0 >> > ipv6.disable=1 fsck.repair=yes noresume >> > >> > # spring chromebook - untested >> > LABEL linux-spring >> > MENU LABEL linux spring >> > LINUX ../zImage-5.18.1-stb-cbe+ >> > INITRD ../initrd.img-5.18.1-stb-cbe+ >> > # rev4 snow chromebook >> > FDT ../dtb-5.18.1-stb-cbe+/exynos5250-spring.dtb >> > APPEND console=tty1 root=LABEL=rootpart ro rootwait net.ifnames=0 >> > ipv6.disable=1 fsck.repair=yes noresume >> > >> > Inside the extra directory there are the following files : >> > >> > a) kernel-chromebook_snow-legacy.tar.gz >> > b) uboot.kpart.cbe-snow >> > c) uboot.kpart.cbe-snow-alternative >> > d) uboot.kpart.cbe-spring >> > >> > 4) /dev/sdh4 : inside here I have copied all the files of the jammy >> > userland prepared by hexdump0818. >> > >> > That's all. What I want to do is if and how can I chainload the >> > "non-verified u-boot" >> > that is installed on the partition /dev/sdh1 with grub or whatever >> > mechanism it is able to boot the hexdump0815 jammy iso image. >> > >> > As I repeat,the "non-verified u-boot" is produced by the script called >> > "build.sh",that's stored inside the u-boot/scripts directory. And if what I >> > want to do is impossible,can you explain to me how I can enable kvm on my >> > chromebook arm,using the most recent kernel possible ? I already know that >> > the support for kvm on arm 32 has been dropped on kernel 5.7,but for me to >> > use a lower kernel than 5.7 is ok. I've been working on this project for a >> > lot of months. I would like to see some progress. Thanks. >> > >> > -- >> > Mario. > > > > -- > Mario.
