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On Sat, 22 Mar 2008, Linus Torvalds wrote: > On Sat, 22 Mar 2008, Stefan Richter wrote: > > > > Can an MMIO region reside above 0x1'0000'0000 on x86-32? ... Apparently yes, > > if CONFIG_RESOURCES_64BIT=y. > > Hmm. It would only work if PAE (HIGHMEM64G) is enabled too. > > And obviously the hardware has to have working 64-bit BAR's. > > AND no, I don't think our x86-32 ioremap() actually works for this case, > because while the resource data may have the full 64 bits, when the > ioremap() happens it gets truncated to 32 bits. > > Ingo/Thomas - should ioremap*() perhaps take "resource_size_t" or a "u64" > for the address (and then "__ioremap()" should probably take a PFN, not a > physical address, and that one can remain just a "unsigned long"?) Hmm. No idea. I look into that on monday (tomorrow is family day). Right now I'm too tired to provide any useful input. > Has anybody ever had a working 64-bit BAR on x86? Ivan? Maybe I'm missing > something.. Same here. Thanks, tglx -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ | |||||||||
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