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riscv: Simplify reset trampoline

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By loading the absolute address of _start_real we can unconditionally
jump to it regardless if the PC is somewhere at 0x0 or at ROM_START_ADDR
This commit is contained in:
Joakim Nohlgård 2021-09-22 10:37:23 +02:00
parent 0b7eb2bbc9
commit b70a4b7694
1 changed files with 2 additions and 5 deletions
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7
cpu/riscv_common/start.S
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@ -18,11 +18,8 @@ _start:
.option push
.option norelax
csrc CSR_MSTATUS, MSTATUS_MIE
la a0, _start
li a1, ROM_START_ADDR
bleu a1, a0, _start_real
la a0, _start_real
add a0, a0, a1
lui a0, %hi(_start_real)
addi a0, a0, %lo(_start_real)
jr a0
_start_real: