Binding error with cache coherence on sparcv8 ISS

[fabien.colas-bigey@…]

The platform is based on the topcell example : caba-ring-ccxcachev1_memcachev1-mipsel. Here are the main differences:

• Sparcv8 instead of mipsel32
• Different memory segments
• No MMU define in the segmentation.h file
• Different linker script for soft (in order to meet sparcv8 requirements)
• Only 4 irqs instead of 5 (sparcv8 requirement)

The problem is that the platform compiles but there is a binding error when launching the system.

Error: (E109) complete binding failed: 2 binds exceeds maximum of 1 allowed: port 'proc3.vci_ini_rw_rspack' (sc_out)

I checked all connexions and it seems ok for me. If anyone could help, this would be great.

Many thanks, Fabien.

[fabien.colas-bigey@…]

Complete platform : requires sparcv8 elf compiler

[Nicolas Pouillon]

Topcell fix

[Nicolas Pouillon]

There are only 4 IRQs on sparc, therefore, you must use IRQ lines 0 to 3 (not 0 to 4). In the attached topcell, you dereference caches's p_irq[4], which aliases what follows in memory (by chance, another port), and you get the error above.

Please see topcell.diff​ for a fix.