[otlib] Add empty PINMUX_TAP_RISCV strap for QEMU

jwnrt · jwnrt · commit aa2f2bdff759 · 2025-10-28T19:09:39.000Z
QEMU does not currently model the TAP straps and enables the RV_DM JTAG
port unconditionally. This strap is added to satisfy tests, but it has
no pins so is a no-op to apply and remove.

Signed-off-by: James Wainwright &lt;james.wainwright@lowrisc.org&gt;
diff --git a/sw/host/opentitanlib/src/app/config/opentitan_qemu.json b/sw/host/opentitanlib/src/app/config/opentitan_qemu.json
@@ -73,6 +73,12 @@
         }
       ]
     },
+    {
+      "name": "PINMUX_TAP_RISCV",
+      // QEMU does not currently model TAP straps, the JTAG interfaces are always available.
+      // For now we model this strap as a no-op without any pins.
+      "pins": [],
+    },
   ],
   "uarts": [
     {

Original file line number	Diff line number	Diff line change
`@@ -73,6 +73,12 @@`
`73`	`73`	`}`
`74`	`74`	`]`
`75`	`75`	`},`
	`76`	`+ {`
	`77`	`+ "name": "PINMUX_TAP_RISCV",`
	`78`	`+ // QEMU does not currently model TAP straps, the JTAG interfaces are always available.`
	`79`	`+ // For now we model this strap as a no-op without any pins.`
	`80`	`+ "pins": [],`
	`81`	`+ },`
`76`	`82`	`],`
`77`	`83`	`"uarts": [`
`78`	`84`	`{`