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SubjectRe: Calling EISA experts
Eric S. Raymond wrote:

> Bingo. I've got reliable /proc tests for ISAPNP, PCI, and MCA. Previous
> discussion indicates I can't get one for ISA classic. An EISA test would,
> as ever, allow me to cut the number of questions about ancient dead
> hardware that users have to see.

Minimal approach: Register motherboard EISA ID (i.e. slot zero) ports in
/proc/ioports. Works on all kernel versions. See $0.02 patch below.

This is probably the least intrusive way to get what you want. It doesn't
add Yet Another Proc File, and costs zero bloat to the 99.9% of us who
have a better chance of meeting Aunt Tillie than an EISA box.

Possible alternative: Create something like /proc/bus/eisa/devices which
lists the EISA ID (e.g. abc0123) found in each EISA slot. This might
have been worthwhile some 8 years ago, but now? ....


--- arch/i386/kernel/setup.c~ Tue Nov 6 19:14:03 2001
+++ arch/i386/kernel/setup.c Mon Jan 21 06:22:15 2002
@@ -122,6 +122,7 @@
int EISA_bus;
+struct resource eisa_id = { "EISA ID", 0xc80, 0xc83, IORESOURCE_BUSY };
int MCA_bus;

@@ -1020,6 +1021,11 @@
/* request I/O space for devices used on all i[345]86 PCs */
for (i = 0; i < STANDARD_IO_RESOURCES; i++)
request_resource(&ioport_resource, standard_io_resources+i);
+ if (EISA_bus)
+ request_resource(&ioport_resource, &eisa_id);

/* Tell the PCI layer not to allocate too close to the RAM area.. */
low_mem_size = ((max_low_pfn << PAGE_SHIFT) + 0xfffff) & ~0xfffff;
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