Forum Discussion

Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
12 years ago

Unaligned access when trying to reach AXI-LW from U-Boot

Hello, I have a QSYS system, including some Avalon-MM peripherials connected to the AXI-LW interface of the HPS. For testing purposes I tried to read their registers from the serial consol...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
12 years ago

It seems that I have to enable the lwhps2fpga bit in the remap register, to remap the address space.

Edit: I still get the same error in uboot.

What I have done:

- mw remap 0x11 to activate the hps2lwfpga

- md 0xff200000 to read the register at offset 0x0

Did I forget something?

Edit: Using the address 0xff800000 directly instead of "remap" seems to work. But when I try to read the registers under 0xff200000 everything is blocked. At least it does not reset the whole thing anymore.

Do I need to configure anything else to be able to communicate with my peripherals in the FPGA?