Re: [PATCH] Add iSCSI iBFT support.

From: Peter Jones
Date: Thu Sep 27 2007 - 13:57:53 EST

H. Peter Anvin wrote:
Peter Jones wrote:
It should, presumably, depend on ACPI, rather than on X86...?
Actually no. That /should/ be the correct answer, but none of the
hardware vendors actually provide the table via ACPI yet. Also, if they
did, the support for /sys/firmware/acpi/tables/* would be sufficient
instead of having this code *at all*.

Is there anything other than the discovery which is braindead about
iBFT? If so, can the tables code be taught to look for this additional
table instead of having all its own mechanism?

Well, the code for the the generic ACPI table sysfs functionality is expecting to find the tables indexed in the RSDT. This is essentially what the iBFT spec's authors seem to have planned, but it's simply never been implemented in the firmware.

AFAICS, it's technically feasible to remove the sysfs parts of this code entirely, make the probe code build a fake ACPI table header, and then add it explicitly if present at the end of acpi_system_sysfs_init() .

I don't know how the ACPI guys would feel about that. Len, thoughts?

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