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ASPEED AST2700 SOC is a 64 bits quad core CPUs (Cortex-a35) and the base address of dram is "0x4 00000000" which is 64bits address. The AST2700 support the maximum DRAM size is 8 GB. The DRAM physical address range is from "0x4_0000_0000" to "0x5_FFFF_FFFF". The DRAM offset range is from "0x0_0000_0000" to "0x1_FFFF_FFFF" and it is enough to use bits [33:0] saving the dram offset. Therefore, save the high part physical address bit[1:0] of Tx/Rx buffer address as dma_dram_offset bit[33:32]. It does not need to decrease the dram physical high part address for DMA operation. (high part physical address bit[7:0] – 4) Signed-off-by: Jamin Lin <jamin_lin@aspeedtech.com> Reviewed-by: Cédric Le Goater <clg@redhat.com>