Swapping ROM and DRAM addresses - Sodor Core

[Kelly Xu]

Hi! 

Is there a way to move the DRAM address range to start at 0x10000 and the boot ROM address range to start at 0x80000000?

We've tried modifying the address parameter under BootROMParams and changing the scratch address in sodor_tile.scala, but this hasn't worked so far. It seems like changing BootROMParams hasn't actually moved the ROM. 

Thank you! 

[Junaid amjad]

Hi,

By doing the above two changes you mentioned I'm able to generate the verilog with DRAM at 0x10000 and the boot ROM at 0x80000000. I did not run any test yet as this would require generating new rom image and riscv binaries with updated address range. Below are the exact changed that I did:
1)_Changed the bootrom address via class WithBootROM in file generators/chipyard/src/main/scala/config/fragments/PeripheralFragments.scala
2)_Changed the scratchpad address via class WithNSodorCores in file generators/riscv-sodor/src/main/scala/sodor/common/sodor_tile.scala.

And I have verified the updated addresses from the generated dts file. 
Let me know if this works or share the exact issue you are facing, thanks.

Regards,
Junaid

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[Kelly Xu]

Hi,

Thanks for the help! 

I changed the bootROM address in the first file to 0x80000000L, and scratch = Some(0x10000L) in the second file. However, I'm running into the error "Sodor core can only have one scratchpad" when running make CONFIG=Sodor1StageConfig. 

Did this work with Sodor1Stage for you or was it a different sodor config? 

Thank you! 

[Junaid amjad]

Hi,
Just comment out this line. This is a hack but looks like it's a safe hack and I have not looked into it in more detail for a proper solution or any side effect from this hack.

Thanks!

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[Kelly Xu]

Thank you, this worked!