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- Anyone tried to run u-boot under qemu-system-ppc64 on a T1040RDB?
Anyone tried to run u-boot under qemu-system-ppc64 on a T1040RDB?
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The Freescale 1.7SDK (yes, I have not yet made the jump to 1.8) has the u-boot-qoriq_2014.07.bb recipe.
Within the u-boot source tree, there is a machine/board target of qemu-ppce500, which appears to be the target to use under qemu/KVM for PowerPC. However, when trying to start a KVM instance with the resulting u-boot image, it appears to immediately freeze/stop. So I am wondering if anyone has already accomplished this.
Notes:
I have tried the following:
qemu-system-ppc64 -enable-kvm -M ppce500 -nographic -bios u-boot.bin
qemu-system-ppc64 -enable-kvm -M ppce500 -nographic -pflash u-boot.bin
qemu-system-ppc64 -enable-kvm -M ppce500 -nographic -kernel u-boot.elf
The last line, with the -kernel, is (attempting) to boot the ELF format image of the u-boot binary. The reason for this was I was attempting to connect a remote instance of GDB to QEMU to debug what was happening, and GDB did not like the non-ELF formats.
Solved! Go to Solution.
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My intention in running u-boot was that I wanted to have, within the virtual machine instance, a boot loader that could choose between one of two different images/kernels to boot - a primary and backup. The backup would be booted if an upgrade or configuration of the primary failed. The goal had been to use u-boot to handle the decision making.
However, since booting u-boot in QEMU/KVM does not appear to be supported under the t1040rdb at the moment, I used an alternative solution.
The virtual machine boots into a first-stage initial RAM disk with its own kernel. Within that RAM disk, a script determines which image should be booted next, then a kexec call is used to boot the target kernel/image. This gets around the lack of u-boot support.
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My intention in running u-boot was that I wanted to have, within the virtual machine instance, a boot loader that could choose between one of two different images/kernels to boot - a primary and backup. The backup would be booted if an upgrade or configuration of the primary failed. The goal had been to use u-boot to handle the decision making.
However, since booting u-boot in QEMU/KVM does not appear to be supported under the t1040rdb at the moment, I used an alternative solution.
The virtual machine boots into a first-stage initial RAM disk with its own kernel. Within that RAM disk, a script determines which image should be booted next, then a kexec call is used to boot the target kernel/image. This gets around the lack of u-boot support.
scottwood
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I believe you're supposed to use the -bios option to run U-Boot in QEMU -- but it's possible that the QEMU in the SDK is too old. Running U-Boot in QEMU is a feature that was added upstream; it's not a supported SDK feature AFAIK. Try downloading the latest upstream QEMU.
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Thank you. Trying the latest QEMU gets me closer.
The default 'u-boot.e500' image which is packaged with QEMU will not load, but an ELF format u-boot binary built out of the SDK will load - but only as long as I do not have '-enable-kvm' added.
I will continue to investigate.
