Messages in this thread |  | | Date | Thu, 8 Nov 2001 09:19:30 -0800 (PST) | From | James Simmons <> | Subject | Re: isa_* problems (hgafb is broken since 2.4.13) |
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> I have two questions about asm-i386/io.h: > 1. Why #define __ISA_IO_base ((char *)(PAGE_OFFSET)) ? > 2. Why not #define __ISA_IO_base ((char *)0) ?
For ix86 the ISA IO space start is at the very begining of memory. On other platforms like the PPC the ISA IO space is seperate from the regular memory space. It starts after the regular memory space thus the __ISA_IO_base will not be 0x0.
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