The Frame Pointer register is used in "__switch_context_nosave" (switch.S) which is called at the end of the startup sequence (entry.S). This register should be initialized before use. (The SparcV8 standard states, page 75 : "Supervisor software may not assume that any particular processor or memory state, except for the PSR’s ET and S bits, has been initialized after a reset trap."
diff a/openbios-devel/arch/sparc32/entry.S b/openbios-devel/arch/sparc32/entry.S --- a/openbios-devel/arch/sparc32/entry.S +++ b/openbios-devel/arch/sparc32/entry.S @@ -452,6 +452,7 @@ highmem: wr %g3, PSR_ET, %psr WRITE_PAUSE + set 0, %fp call __switch_context_nosave nop
Signed-off-by: Olivier DANET odanet@caramail.com