vexriscv_smp: only 32 CSR locations supported with current mem_mam

[AndrewD]

The current memory map allows for 32 CSR locations:
INFO:SoC:32-bit CSR Bus, 32-bit Aligned, 16.0KiB Address Space, 2048B Paging, big Ordering (Up to 32 Locations).

This can be expanded to 64 by specifying --csr-address-width=15, however the cpu mem_map places clint straight after csr
"csr": 0xf000_0000,
"clint": 0xf001_0000,

So this causes the following build error:

ERROR:SoCBusHandler:Region overlap between clint and csr:
ERROR:SoCBusHandler:Origin: 0xf0010000, Size: 0x00010000, Mode: RW, Cached: False Linker: False
ERROR:SoCBusHandler:Origin: 0xf0000000, Size: 0x00020000, Mode: RW, Cached: False Linker: False

Can the mem_map be adjusted easily to support additional CSR locations?

[Gwenhael Goavec-Merou]

Hi,
True: CSR region is a bit small.

With #1876 it is possible to move CSR/CLINT/PLIC (and consequently it's possible to increase CSR region).

This may be done by overriding region directly from the target and/or by passing region base address using CLI args.

Is this solution is good to you?

[AndrewD]

Thanks - that should address the issue.

…

On Tue, 23 Jan 2024 at 04:41, Gwenhael Goavec-Merou < ***@***.***> wrote: Hi, True: CSR region is a bit small. With #1876 <#1876> it is possible to move CSR/CLINT/PLIC (and consequently it's possible to increase CSR region). This may be done by overriding region directly from the target and/or by passing region base address using CLI args. Is this solution is good to you? — Reply to this email directly, view it on GitHub <#1875 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AAAX6Y3FEERAPVRCMLSROZ3YP2QGNAVCNFSM6AAAAABCBGK6PKVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMYTSMBUGQ4TOMBZGA> . You are receiving this because you authored the thread.Message ID: ***@***.***>

[enjoy-digital]

As noted by @AndrewD, #1885 can also be useful for this. You now have the possibility to move CLINT/PLIC or reduce CSR paging.

[enjoy-digital]

Thanks @AndrewD for the feedback.