From 5bdf022d07f1efcf8bc1647c78a294ab2baf4c9b Mon Sep 17 00:00:00 2001 From: Charles Papon Date: Fri, 1 May 2020 09:28:38 +0530 Subject: [PATCH] firmware: fw_base: Remove CSR_MTVEC update check 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 Reviewed-by: Atish Patra Reviewed-by: Anup Patel --- firmware/fw_base.S | 3 --- 1 file changed, 3 deletions(-) diff --git a/firmware/fw_base.S b/firmware/fw_base.S index cc6381da..07edc749 100644 --- a/firmware/fw_base.S +++ b/firmware/fw_base.S @@ -400,9 +400,6 @@ _start_warm: /* 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