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Altera_Forum's avatar
Altera_Forum
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15 years ago

Read physical address

Hello, I'm trying to read address 0x0400000 (start address of avalon interface 32bits read) and the NIOS just stopped working, I can't read the entire memory block (0x0400000 - 0x040ffff or so...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

You will need to disable the data cache in order to access the hardware registers (and get sensible actions from the hardware).

The nios cpu itself shouldn't stop if it performs a cache line read/write, but your hardware device might be buggy (and fail to terminate the back to back cycles) and/or contain a register that just does a reset!