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| author | Clifford Wolf <clifford@clifford.at> | 2017-09-20 20:17:27 +0200 |
|---|---|---|
| committer | Clifford Wolf <clifford@clifford.at> | 2017-09-20 20:17:27 +0200 |
| commit | 51436b1c5017012fb1d666d8a7ffcb96b0906d73 (patch) | |
| tree | b31b03127316677e013ece1c53334ac1079319f7 /picosoc/start.s | |
| parent | 7639e6ebac26fafbff2c3e2a72e83cf5cd0c3a3e (diff) | |
| download | picorv32-51436b1c5017012fb1d666d8a7ffcb96b0906d73.tar.gz picorv32-51436b1c5017012fb1d666d8a7ffcb96b0906d73.zip | |
PicoSoC QSPI DDR progress
Diffstat (limited to 'picosoc/start.s')
| -rw-r--r-- | picosoc/start.s | 13 |
1 files changed, 10 insertions, 3 deletions
diff --git a/picosoc/start.s b/picosoc/start.s index 9a285d1..5e43feb 100644 --- a/picosoc/start.s +++ b/picosoc/start.s @@ -1,8 +1,10 @@ .section .text start: + +# zero-initialize register file addi x1, zero, 0 -addi x2, zero, 0 +# x2 (sp) is initialized by reset addi x3, zero, 0 addi x4, zero, 0 addi x5, zero, 0 @@ -33,9 +35,14 @@ addi x29, zero, 0 addi x30, zero, 0 addi x31, zero, 0 -li sp, 4*256 -call main +# zero initialize scratchpad memory +setmemloop: +sw zero, 0(x1) +addi x1, x1, 4 +blt x1, sp, setmemloop +# call main +call main loop: j loop |