1 files changed, 0 insertions, 159 deletions
diff --git a/picosoc/start.s b/picosoc/start.s
deleted file mode 100644
index e9e18db..0000000
--- a/picosoc/start.s
+++ /dev/null
@@ -1,159 +0,0 @@
-.section .text
-
-start:
-
-# zero-initialize register file
-addi x1, zero, 0
-# x2 (sp) is initialized by reset
-addi x3, zero, 0
-addi x4, zero, 0
-addi x5, zero, 0
-addi x6, zero, 0
-addi x7, zero, 0
-addi x8, zero, 0
-addi x9, zero, 0
-addi x10, zero, 0
-addi x11, zero, 0
-addi x12, zero, 0
-addi x13, zero, 0
-addi x14, zero, 0
-addi x15, zero, 0
-addi x16, zero, 0
-addi x17, zero, 0
-addi x18, zero, 0
-addi x19, zero, 0
-addi x20, zero, 0
-addi x21, zero, 0
-addi x22, zero, 0
-addi x23, zero, 0
-addi x24, zero, 0
-addi x25, zero, 0
-addi x26, zero, 0
-addi x27, zero, 0
-addi x28, zero, 0
-addi x29, zero, 0
-addi x30, zero, 0
-addi x31, zero, 0
-
-# Update LEDs
-li a0, 0x03000000
-li a1, 1
-sw a1, 0(a0)
-
-# zero initialize entire scratchpad memory
-li a0, 0x00000000
-setmemloop:
-sw a0, 0(a0)
-addi a0, a0, 4
-blt a0, sp, setmemloop
-
-# Update LEDs
-li a0, 0x03000000
-li a1, 3
-sw a1, 0(a0)
-
-# copy data section
-la a0, _sidata
-la a1, _sdata
-la a2, _edata
-bge a1, a2, end_init_data
-loop_init_data:
-lw a3, 0(a0)
-sw a3, 0(a1)
-addi a0, a0, 4
-addi a1, a1, 4
-blt a1, a2, loop_init_data
-end_init_data:
-
-# Update LEDs
-li a0, 0x03000000
-li a1, 7
-sw a1, 0(a0)
-
-# zero-init bss section
-la a0, _sbss
-la a1, _ebss
-bge a0, a1, end_init_bss
-loop_init_bss:
-sw zero, 0(a0)
-addi a0, a0, 4
-blt a0, a1, loop_init_bss
-end_init_bss:
-
-# Update LEDs
-li a0, 0x03000000
-li a1, 15
-sw a1, 0(a0)
-
-# call main
-call main
-loop:
-j loop
-
-.global flashio_worker_begin
-.global flashio_worker_end
-
-.balign 4
-
-flashio_worker_begin:
-# a0 ... data pointer
-# a1 ... data length
-# a2 ... optional WREN cmd (0 = disable)
-
-# address of SPI ctrl reg
-li   t0, 0x02000000
-
-# Set CS high, IO0 is output
-li   t1, 0x120
-sh   t1, 0(t0)
-
-# Enable Manual SPI Ctrl
-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:
-beqz a1, flashio_worker_L3
-li   t5, 8
-lbu  t2, 0(a0)
-flashio_worker_L2:
-srli t4, t2, 7
-sb   t4, 0(t0)
-ori  t4, t4, 0x10
-sb   t4, 0(t0)
-lbu  t4, 0(t0)
-andi t4, t4, 2
-srli t4, t4, 1
-slli t2, t2, 1
-or   t2, t2, t4
-andi t2, t2, 0xff
-addi t5, t5, -1
-bnez t5, flashio_worker_L2
-sb   t2, 0(a0)
-addi a0, a0, 1
-addi a1, a1, -1
-j    flashio_worker_L1
-flashio_worker_L3:
-
-# Back to MEMIO mode
-li   t1, 0x80
-sb   t1, 3(t0)
-
-ret
-
-.balign 4
-flashio_worker_end: