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riscv-openocd
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For BSCAN tunneling, USER4 only needs to be scanned into IR once, 

and then left there for the remainder of the session.
This commit is contained in:
Greg Savin 2019-11-04 16:14:10 -08:00
parent f93ede5401
commit 32413fee3e
1 changed files with 11 additions and 2 deletions
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13
src/target/riscv/riscv.c
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@ -172,6 +172,7 @@ struct scan_field select_idcode = {
bscan_tunnel_type_t bscan_tunnel_type;
int bscan_tunnel_ir_width; /* if zero, then tunneling is not present/active */
bool bscan_user4_selected = false;
uint8_t bscan_zero[4] = {0};
uint8_t bscan_one[4] = {1};
@ -275,7 +276,10 @@ static int riscv_resume_go_all_harts(struct target *target);
void select_dmi_via_bscan(struct target *target)
{
jtag_add_ir_scan(target->tap, &select_user4, TAP_IDLE);
if (!bscan_user4_selected) {
jtag_add_ir_scan(target->tap, &select_user4, TAP_IDLE);
bscan_user4_selected = true;
}
if (bscan_tunnel_type == BSCAN_TUNNEL_DATA_REGISTER)
jtag_add_dr_scan(target->tap, bscan_tunnel_data_register_select_dmi_num_fields,
bscan_tunnel_data_register_select_dmi, TAP_IDLE);
@ -350,7 +354,12 @@ uint32_t dtmcontrol_scan_via_bscan(struct target *target, uint32_t out)
tunneled_dr[0].out_value = bscan_one;
tunneled_dr[0].in_value = NULL;
}
jtag_add_ir_scan(target->tap, &select_user4, TAP_IDLE);
if (!bscan_user4_selected) {
jtag_add_ir_scan(target->tap, &select_user4, TAP_IDLE);
bscan_user4_selected = true;
}
jtag_add_dr_scan(target->tap, DIM(tunneled_ir), tunneled_ir, TAP_IDLE);
jtag_add_dr_scan(target->tap, DIM(tunneled_dr), tunneled_dr, TAP_IDLE);
select_dmi_via_bscan(target);