Re: [PATCH 5/4] ARM: footbridge: remove custom DMA address handling
From: "Russell King (Oracle)" <linux@armlinux.org.uk>
Date: 2022-08-25 10:36:05
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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! _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel