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author | wdenk <wdenk> | 2004-05-19 21:33:14 +0000 |
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committer | wdenk <wdenk> | 2004-05-19 21:33:14 +0000 |
commit | e4cc71aa4403c82f0b3e89087024f83832ece9ec (patch) | |
tree | 48c8295c714dfbfe7be70796c87b41c2065f166f /cpu/nios/start.S | |
parent | 10767ccb86e0413633e7d89fbbb354014288b036 (diff) | |
download | u-boot-imx-e4cc71aa4403c82f0b3e89087024f83832ece9ec.zip u-boot-imx-e4cc71aa4403c82f0b3e89087024f83832ece9ec.tar.gz u-boot-imx-e4cc71aa4403c82f0b3e89087024f83832ece9ec.tar.bz2 |
Patch by Scott McNutt, 25 Apr 2004:
Add Nios GDB/JTAG Console support:
- Add stubs to support gdb via JTAG.
- Add support for console over JTAG.
- Minor cleanup.
Diffstat (limited to 'cpu/nios/start.S')
-rw-r--r-- | cpu/nios/start.S | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/cpu/nios/start.S b/cpu/nios/start.S index 7cbd1a7..cb1af3c 100644 --- a/cpu/nios/start.S +++ b/cpu/nios/start.S @@ -93,6 +93,14 @@ _start: subi %g6, 4 /* %g6 <- src addr */ ld %g7, [%g7] /* %g7 <- dst addr */ + /* No need to move text sections if we're already located + * at the proper address. + */ + cmp %g7, %g6 + ifs cc_z + br reloc + nop /* delay slot */ + 1: cmp %g7, %g5 skps cc_nz br 2f @@ -114,6 +122,7 @@ _start: pfx %xhi(reloc@h) movhi %g0, %xlo(reloc@h) jmp %g0 + nop /* delay slot */ reloc: /* @@ -141,6 +150,48 @@ reloc: 4: /* + * INIT VECTOR TABLE + */ + pfx %hi(CFG_VECT_BASE) + movi %g0, %lo(CFG_VECT_BASE) + pfx %xhi(CFG_VECT_BASE) + movhi %g0, %xlo(CFG_VECT_BASE) /* dst */ + mov %l0, %g0 + + pfx %hi(_vectors) + movi %g1, %lo(_vectors) + pfx %xhi(_vectors) + movhi %g1, %xlo(_vectors) /* src */ + bgen %g2, 6 /* cnt = 64 */ + + ldp %g3, [%l0, 3] /* bkpt vector */ + ldp %g4, [%l0, 4] /* single step vector */ + +5: ld %g7, [%g1] + addi %g1, 4 /* src++ */ + st [%g0], %g7 + addi %g0, 4 /* dst++ */ + + subi %g2, 1 /* cnt-- */ + ifrnz %g2 + br 5b + nop /* delay slot */ + +#if defined(CONFIG_ROM_STUBS) + /* Restore the breakpoint and single step exception + * vectors to their original values. + */ + stp [%l0,3], %g3 /* breakpoint */ + stp [%l0,4], %g4 /* single step */ +#endif + + /* For debug startup convenience ... software breakpoints + * set prior to this point may not succeed ;-) + */ + .global __start +__start: + + /* * Call board_init -- never returns */ pfx %hi(board_init@h) |