Re: [PATCH] 2.3.23pre4 - DMA fix, boot failure on ABIT BP6

Jeff Garzik (jgarzik@mandrakesoft.com)
Thu, 21 Oct 1999 03:08:34 -0400

Does the following imply that handling of ISA memory space will now be
different across architectures? ie. don't ioremap ISA space on x86, but
do ioremap it on Alpha?

>From include/asm-i386/io.h in 2.3.23 pre5:
+/*
+ * ISA space is 'always mapped' on a typical x86 system, no need to
+ * explicitly ioremap() it. The fact that the ISA IO space is mapped
+ * to PAGE_OFFSET is pure coincidence - it does not mean ISA values
+ * are physical addresses. The following constant pointer can be
+ * used as the IO-area pointer (it can be iounmapped as well, so the
+ * analogy with PCI is quite large):
+ */

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