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| author | Clifford Wolf <clifford@clifford.at> | 2017-09-19 15:32:41 +0200 |
|---|---|---|
| committer | Clifford Wolf <clifford@clifford.at> | 2017-09-19 15:32:41 +0200 |
| commit | 7639e6ebac26fafbff2c3e2a72e83cf5cd0c3a3e (patch) | |
| tree | d344f2a29afb2d11890425ca52e87f5ad6812b88 /picosoc/start.s | |
| parent | 2cc1256ce7aab8637d82d91506cdeb73d42604b2 (diff) | |
| download | picorv32-7639e6ebac26fafbff2c3e2a72e83cf5cd0c3a3e.tar.gz picorv32-7639e6ebac26fafbff2c3e2a72e83cf5cd0c3a3e.zip | |
PicoSoC QSPI and XIP now working (tested in hardware)
Diffstat (limited to 'picosoc/start.s')
| -rw-r--r-- | picosoc/start.s | 19 |
1 files changed, 17 insertions, 2 deletions
diff --git a/picosoc/start.s b/picosoc/start.s index 5b051b0..9a285d1 100644 --- a/picosoc/start.s +++ b/picosoc/start.s @@ -45,6 +45,7 @@ j loop flashio_worker_begin: # a0 ... data pointer # a1 ... data length +# a2 ... optional WREN cmd (0 = disable) # address of SPI ctrl reg li t0, 0x02000000 @@ -54,8 +55,22 @@ li t1, 0x120 sh t1, 0(t0) # Enable Manual SPI Ctrl -li t1, 0x00 -sb t1, 3(t0) +sb zero, 3(t0) + +# Send optional WREN cmd +beqz a2, flashio_worker_L1 +li t5, 8 +andi t2, a2, 0xff +flashio_worker_L4: +srli t4, t2, 7 +sb t4, 0(t0) +ori t4, t4, 0x10 +sb t4, 0(t0) +slli t2, t2, 1 +andi t2, t2, 0xff +addi t5, t5, -1 +bnez t5, flashio_worker_L4 +sb t1, 0(t0) # SPI transfer flashio_worker_L1: |