Remove unnecessary CSR_MTVEC read to reduce the openSBI CSR requirement.
Mux are costly in FPGA. Allowing CSR_MTVEC to be write only is usefull
for the FMax/Area of FPGA softcore.
https://github.com/SpinalHDL/opensbi.git branch mtvec
Signed-off-by: Charles Papon <charles.papon.90@gmail.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
Reviewed-by: Anup Patel <anup.patel@wdc.com>
/* Setup trap handler */
la a4, _trap_handler
csrw CSR_MTVEC, a4
- /* Make sure that mtvec is updated */
-1: csrr a5, CSR_MTVEC
- bne a4, a5, 1b
/* Initialize SBI runtime */
csrr a0, CSR_MSCRATCH