Linux/DRA746: How to print emmc write content in linux kernel.

DMA controller use HIGH MEM ADDRESS as dma_address, how can it convert to kernel virtual address?

For example, HIGH MEM ADDRESS is 0xfd9b7000, which is physical ddr address used by DMA.
sg_virt , phy_to_virt,ioremap all failed when converting HIGH MEM ADDRESS to kernel virtual address

Hi, Xiaofeng Zang,

Your questions have been forwarded to Linux expert.

Regards,
Mariya

Hi

are you suggesting that the actual buffer allocation happened from high memory region(as a struct page) and you want to know  how to map this as kernel virtual address?

All allocations from the high mem region, have to be mapped using kmap() family of functions to be accessed from within the kernel

Can you provide more information how you ended up with an allocation from the high mem region (who allocated this buffer?)