Messages in this thread | | | Date | Fri, 30 Jul 2004 09:53:39 -0700 (PDT) | From | Jon Smirl <> | Subject | Exposing ROM's though sysfs |
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We talked at OLS about exposing adapter ROMs via sysfs. I have some time to work on this but I'm not sure about the right places to hook into the kernel.
The first problem is recording the boot video device. This is needed for laptops that compress their video and system ROMs together into a single ROM. When sysfs exposes the ROM for these adapters it needs to know the boot video device so that it can return the ROM image at C000:0 instead of trying to find an actual ROM. What is the right kernel structure for recording the boot video device? Where should this code live? It is probably x86 specific but have non-x86 laptops done the same trick?
What about ISA support. Should we make an attempt to return ROM contents from ISA cards?
Note that not just video cards can have ROMs. Disk adapters commonly have them too. We probably want to expose these ROMs too.
Do we want to expose the system ROM via sysfs? Where should it appear?
Some Radeon cards have a bug where they forgot to clear a latch which makes the ROMs visible. Where should a fix for things like this go? I can put it in the radeon driver but if you try to read the ROM before the driver is loaded, the ROM won't be visible.
===== Jon Smirl jonsmirl@yahoo.com
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