GSRD v16.1 memmap support

[roberbot]

mmap does not allocate. Just maps virtual address where application is running to physical ones so you can access from the application to the hardware in FPGA.
I am confused because you talk about the kernel as if you are running in Operating System but later you talk about uboot.
Maybe this answer is helpful to you:

Write to physical ram address

Hi! You have to use kmalloc() to allocate a phisically contiguous buffer in memory. It will give you the physical address you can access from the FPGA and a virtual access to access the buffer from inside the driver. But kmalloc is in cached memory so you have to add 0x80000000 to the physical address and use that address from the FPGA to access through ACP port in a coherent way. The problem is that you need to first configure ACP. If you want to access from the L3 to SDRAM port you , first y…