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Altera_Forum's avatar
Altera_Forum
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10 years ago

mSGDMA, Qsys, and Linux Integration

So I've been trying to get the Modular SG-DMA working in a Qsys project tied with Linux. I can get it to show up in the device tree, be recognized by Linux in /sys, and it looks like the memory mappi...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
10 years ago

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What value is MAP_PIO_SIZE?

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# define MAP_PIO_SIZE (0x00100000)

In my case I dedicate 1 MB of top of memory to FPGA. To dedicate it to FPGA I start kernel with mem option

setenv net_nfs run netload nfsargs addip addargs \; bridge enable \; bootm ${kernel_addr_r} - ${fdt_addr} mem=0x3FF00000

where 0x3FF00000 is 2 GB ( RAM installed on the board ) - 1 MB (dedicated to FPGA)