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Altera_Forum's avatar
Altera_Forum
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10 years ago

Bus error when trying to write to memory

Hi I use cycone V board with 2GB Micron sdram, i cofigure the preloader and u-boot to have 2GB sdram also. I cant write with memtool to address from 0x80000000 to 0xc0000000 - i have Bus err...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
10 years ago

A couple of things to check before you access physical address 0x8000_0000:

1) You have configured the FPGA before you go to access this location right? That location is the H2F bridge

2) Double check that the bridge is mapped into the address space, there is a remap register in the L3 at address 0xFF80_0000 and if the H2F bridge is mapped properly then bit 3 should be set. If the bridge isn't mapped then you should expect an abort.