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[Qemu-devel] How to generate custom fw paths for IDE devices?

From: Mark Cave-Ayland
Subject: [Qemu-devel] How to generate custom fw paths for IDE devices?
Date: Wed, 18 Jul 2018 22:13:38 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1

Hi all,

Following on from a couple of patches I've previously posted to the mailing list at https://lists.gnu.org/archive/html/qemu-devel/2018-06/msg08836.html I've made some good progress with trying to add bootindex support to OpenBIOS but I'm stuck with generating the IDE device paths from QEMU.

According to OpenBIOS the device path for a cdrom on a sun4u machine should be:


whereas with my working patchset I'm currently generating:


The issue is that the address@hidden part is being generated by the IDE drive device attached to the IDE bus in hw/ide/qdev.c, and so I think I need to override idebus_get_fw_dev_path() to manually generate the remainder of the path including both the controller and the correctly named drive node.

One option may be to consider subclassing IDEBus and overriding idebus_get_fw_dev_path() there, but the cmd646 device is a child of TYPE_PCI_IDE which has its own internal IDEBus and so it seems overriding it is impossible.

Can anyone point me in the right direction as to how to generate the correct fw path for IDE devices in the above format for sun4u machines?



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