Messages in this thread | | | Date | Thu, 25 Aug 2022 11:35:56 +0100 | From | "Russell King (Oracle)" <> | Subject | Re: [PATCH 5/4] ARM: footbridge: remove custom DMA address handling |
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On Thu, Aug 25, 2022 at 11:17:52AM +0200, Arnd Bergmann wrote: > -/* > - * The footbridge is programmed to expose the system RAM at 0xe0000000. > - * The requirement is that the RAM isn't placed at bus address 0, which > - * would clash with VGA cards. > - */ > -#define BUS_OFFSET 0xe0000000 > -#define __virt_to_bus(x) ((x) + (BUS_OFFSET - PAGE_OFFSET)) > -#define __bus_to_virt(x) ((x) - (BUS_OFFSET - PAGE_OFFSET))
... and this tells you why that is with ISA devices.
So, one hell of a big NAK to this patch, sorry.
-- RMK's Patch system: https://www.armlinux.org.uk/developer/patches/ FTTP is here! 40Mbps down 10Mbps up. Decent connectivity at last!
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