Re: [PATCH v2] ARM: bcm2835: Use 0x4 prefix for DMA bus addresses to SDRAM.

On Tue, 05 May 2015, Eric Anholt wrote: > There exists a tiny MMU, configurable only by the VC (running the > closed firmware), which maps from the ARM's physical addresses to bus > addresses. These bus addresses determine the caching behavior in the > VC's L1/L2 (note: separate from the ARM's L1

[PATCH v2] ARM: bcm2835: Use 0x4 prefix for DMA bus addresses to SDRAM.

There exists a tiny MMU, configurable only by the VC (running the closed firmware), which maps from the ARM's physical addresses to bus addresses. These bus addresses determine the caching behavior in the VC's L1/L2 (note: separate from the ARM's L1/L2) according to the top 2 bits. The bits in th