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qemu arm: fix boot with -M virt,highmem=off

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Ciro Santilli
2018-08-11 20:47:11 +01:00
parent 4f6b206ccf
commit 688d26ecd6
2 changed files with 4 additions and 14 deletions
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14
README.adoc
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@@ -2436,18 +2436,6 @@ Bibliography:
=== arm === arm
QEMU 3.0.0-rc3 and 3.0.0-rc4 boot failing: http://lists.nongnu.org/archive/html/qemu-discuss/2018-08/msg00030.html
....
<4>[ 0.723878] VFS: Cannot open root device "vda" or unknown-block(0,0): error -6
<4>[ 0.724096] Please append a correct "root=" boot option; here are the available partitions:
<4>[ 0.724585] 1f00 131072 mtdblock0
<4>[ 0.724632] (driver?)
<0>[ 0.724998] Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0)
....
Workaround for now by going back to QEMU v2.12.0 with <<qemu-build-variants>>.
==== Run arm executable in aarch64 ==== Run arm executable in aarch64
TODO Can you run arm executables in the aarch64 guest? https://stackoverflow.com/questions/22460589/armv8-running-legacy-32-bit-applications-on-64-bit-os/51466709#51466709 TODO Can you run arm executables in the aarch64 guest? https://stackoverflow.com/questions/22460589/armv8-running-legacy-32-bit-applications-on-64-bit-os/51466709#51466709
@@ -9468,7 +9456,7 @@ However, for many types of crashes, it is trivial to bisect down to the offendin
For example, when updating from QEMU `v2.12.0` to `v3.0.0-rc3`, the Linux kernel boot started to panic for `arm`. For example, when updating from QEMU `v2.12.0` to `v3.0.0-rc3`, the Linux kernel boot started to panic for `arm`.
We then bisected it as explained at: https://stackoverflow.com/questions/4713088/how-to-use-git-bisect with the link:qemu-bisect-boot[] script: We then bisected it as explained at: https://stackoverflow.com/questions/4713088/how-to-use-git-bisect/22592593#22592593 with the link:qemu-bisect-boot[] script:
.... ....
cd qemu cd qemu

4
run
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@@ -350,9 +350,11 @@ ${qemu_common}\
else else
cpu=cortex-a57 cpu=cortex-a57
fi fi
# highmem=off needed since v3.0.0 due to:
# http://lists.nongnu.org/archive/html/qemu-discuss/2018-08/msg00034.html
cmd="\ cmd="\
${qemu_common}\ ${qemu_common}\
-M virt \\ -M virt,highmem=off \\
-append '${root} ${extra_append}' \\ -append '${root} ${extra_append}' \\
-cpu "$cpu" \\ -cpu "$cpu" \\
${virtio_gpu_pci}\ ${virtio_gpu_pci}\