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Altera_Forum
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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

What I do from uboot:

run mmcfpga -> to load my rbf

run bridge_enable_handoff -> to enable the bridges

Make sure there is something on register 0 in the FPGA, and start with writes io of reads ( reads hang when there is nothing present, writes are a bit more robust ;p )

Other remarks:

- The mapping loaded in uboot seems to be 1 to 1 so there is not need to recalculate addresses there

- Use a preloader/uboot generated from the correct handover files