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==== Differences between US-II and US-III ====

  * run on machines with different firmware
    * difference in the boot process (see [[http://helenos-blog.pavel-rimsky.cz/?p=3]])
    * claiming physical memory for the boot allocator failes on US-III (workaround: decrease the amount of memory available for the boot allocator from 1024 kB to 256 kB)
    * the firmware is setting the value of the ''WSTATE'' register to ''0x00'' on US-II and to ''0x05'' on US-III

  * cache sizes
    * US-II has a 32kB 2-way associative I-cache, US-III has a 64kB 4-way associative I-cache

  * cache coherency
    * US-III cache is write-invalidate, so there is no need to invalidate its entries after self-modifying the code
    * the argument of the ''FLUSH'' instruction is ignored on US-III

  * memory
    * US-II supports a 44-bit virtual address space and a 41-bit physical address space; US-III supports a 64-bit virtual address space and a 43-bit physical address space
      * therefore the TTE is slightly different on US-III: the DIAG field has been removed, so the PA size can be 43 bits (other bits gained by removing DIAG are impl. dep./reserved)
    * US-II has one 64-entry TLB for D-MMU and one 64-bit entry TLB for I-MMU, whereas US-III has three TLBs for D-MMU (16 + 512 + 512 entries) and two TLBs for I-MMU (16 + 128 entries)
    * definitions of various ASI register addresses and values differ

  * Simics support
    * graphics console is fully supported on Sunfire; there are a lot of limitations on Serengeti (https://www.simics.net/mwf/topic_show.pl?tid=18784) which make the graphics console almost unusable