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Merge pull request #999 from rosethompson/main

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Removes conflicting FPGA zsbl file
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Jordan Carlin 2024-10-10 12:03:58 -07:00 committed by GitHub
commit a03ecd0d97
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1 changed files with 0 additions and 102 deletions
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fpga/zsbl/bios.S
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@ -1,102 +0,0 @@
#include "system.h"
PERIOD = (SYSTEMCLOCK / 2)
.section .init
.global _start
.type _start, @function
_start:
# Initialize global pointer
.option push
.option norelax
1:auipc gp, %pcrel_hi(__global_pointer$)
addi gp, gp, %pcrel_lo(1b)
.option pop
li x1, 0
li x2, 0
li x4, 0
li x5, 0
li x6, 0
li x7, 0
li x8, 0
li x9, 0
li x10, 0
li x11, 0
li x12, 0
li x13, 0
li x14, 0
li x15, 0
li x16, 0
li x17, 0
li x18, 0
li x19, 0
li x20, 0
li x21, 0
li x22, 0
li x23, 0
li x24, 0
li x25, 0
li x26, 0
li x27, 0
li x28, 0
li x29, 0
li x30, 0
li x31, 0
# set the stack pointer to the top of memory - 8 bytes (pointer size)
li sp, (EXT_MEM_END - 8)
li a0, 0x00000000
li a1, EXT_MEM_BASE
#li a2, 128*1024*1024/512 # copy 128MB
li a2, 127*1024*1024/512 # copy 127MB upper 1MB contains the return address (ra)
#li a2, 800 # copy 400KB
jal ra, copyFlash
fence.i
# now toggle led so we know the copy completed.
# write to gpio
li t2, 0xFF
la t3, 0x1006000C
li t4, 5
loop:
# delay
li t0, PERIOD/2
delay1:
addi t0, t0, -1
bge t0, x0, delay1
sw t2, 0x0(t3)
li t0, PERIOD/2
delay2:
addi t0, t0, -1
bge t0, x0, delay2
sw x0, 0x0(t3)
addi t4, t4, -1
bgt t4, x0, loop
# now that the card is copied and the led toggled we
# jump to the copied contents of the sd card.
jumpToLinux:
csrrs a0, 0xF14, x0 # copy hart ID to a0
li a1, FDT_ADDRESS # This is the device tree address
la a2, end_of_bios
li t0, EXT_MEM_BASE # start of code
jalr x0, t0, 0
end_of_bios: