I expect that is just a holdover from some earlier version of the `defs.h` file that may have define...

Tim Edwards

07/29/2024, 7:41 PM

I expect that is just a holdover from some earlier version of the

defs.h

file that may have defined

reg_la0_data_in

as an alias for

reg_la0_data

. There shouldn't be any difference, and both should point to

0x25000000

samarth jain

07/29/2024, 9:21 PM

I managed to make it work. The correct register to use is reg_la0_data_in only and not other one @Tim Edwards @Anton Maurovic (efabless support)

Tim Edwards

07/29/2024, 9:24 PM

I don't even have a

defs.h

file that defines

reg_la0_data_in

. . .

Anton Maurovic (efabless support)

07/29/2024, 9:33 PM

@Tim Edwards It does look like something is a little mismatched. This appears to be what is working for Samarth: • https://github.com/efabless/caravel_mgmt_soc_litex/blob/503eda0790085712ffef7f4ad8934c7daed3237f/verilog/dv/firmware/defs.h#L71-L74 • Base address is here: https://github.com/efabless/caravel_mgmt_soc_litex/blob/503eda0790085712ffef7f4ad8934c7daed3237f/verilog/dv/generated/csr.h#L282 This is not consistent with with the

caravel

repo: https://github.com/efabless/caravel/blob/487a439614d25a71b68bb6bf7d7fa62b6dfd33cd/verilog/dv/caravel/defs.h#L48-L51

Anton Maurovic (efabless support)

07/29/2024, 9:34 PM

...even though the last link there has a comment referring to the newer (?) address but then using the older (?) address.

Anton Maurovic (efabless support)

07/29/2024, 9:40 PM

It appears that

reg_la0_data_in

is defined (indirectly) as:

(*(volatile uint32_t*) ((0xf0000000L + 0x3020L) + 12))

Anton Maurovic (efabless support)

07/29/2024, 9:52 PM

So in summary,

caravel/verilog/dv/caravel/defs.h

appears to be outdated (?),

caravel_mgmt_soc_litex/verilog/dv/firmware/defs.h

appears to be correct, but don't trust the comments in the latter because they're wrong.

Tim Edwards

07/30/2024, 12:32 AM

Cripes.

😁 1

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