diff options
| -rw-r--r-- | doc/openocd.texi | 28 | ||||
| -rw-r--r-- | src/jtag/core.c | 15 | ||||
| -rw-r--r-- | src/jtag/jtag.h | 33 | ||||
| -rw-r--r-- | src/jtag/tcl.c | 18 | ||||
| -rw-r--r-- | tcl/target/ti_dm355.cfg | 7 | ||||
| -rw-r--r-- | tcl/target/ti_dm365.cfg | 20 | ||||
| -rw-r--r-- | tcl/target/ti_dm6446.cfg | 22 |
7 files changed, 93 insertions, 50 deletions
diff --git a/doc/openocd.texi b/doc/openocd.texi index 32797fb..8156de4 100644 --- a/doc/openocd.texi +++ b/doc/openocd.texi @@ -2428,12 +2428,18 @@ The TAP events currently defined are: @itemize @bullet @item @b{post-reset} @* The TAP has just completed a JTAG reset. -For the first such handler called, the tap is still -in the JTAG @sc{reset} state. +The tap may still be in the JTAG @sc{reset} state. +Handlers for these events might perform initialization sequences +such as issuing TCK cycles, TMS sequences to ensure +exit from the ARM SWD mode, and more. + Because the scan chain has not yet been verified, handlers for these events @emph{should not issue commands which scan the JTAG IR or DR registers} of any particular target. @b{NOTE:} As this is written (September 2009), nothing prevents such access. +@item @b{setup} +@* The scan chain has been reset and verified. +This handler may enable TAPs as needed. @item @b{tap-disable} @* The TAP needs to be disabled. This handler should implement @command{jtag tapdisable} @@ -2450,7 +2456,7 @@ contents to be accurate), you might: @example jtag configure CHIP.jrc -event post-reset @{ - echo "Reset done" + echo "JTAG Reset done" ... non-scan jtag operations to be done after reset @} @end example @@ -2493,20 +2499,30 @@ does include a kind of JTAG router functionality. In OpenOCD, tap enabling/disabling is invoked by the Tcl commands shown below, and is implemented using TAP event handlers. So for example, when defining a TAP for a CPU connected to -a JTAG router, you should define TAP event handlers using +a JTAG router, your @file{target.cfg} file +should define TAP event handlers using code that looks something like this: @example jtag configure CHIP.cpu -event tap-enable @{ - echo "Enabling CPU TAP" ... jtag operations using CHIP.jrc @} jtag configure CHIP.cpu -event tap-disable @{ - echo "Disabling CPU TAP" ... jtag operations using CHIP.jrc @} @end example +Then you might want that CPU's TAP enabled almost all the time: + +@example +jtag configure $CHIP.jrc -event setup "jtag tapenable $CHIP.cpu" +@end example + +Note how that particular setup event handler declaration +uses quotes to evaluate @code{$CHIP} when the event is configured. +Using brackets @{ @} would cause it to be evaluated later, +at runtime, when it might have a different value. + @deffn Command {jtag tapdisable} dotted.name If necessary, disables the tap by sending it a @option{tap-disable} event. diff --git a/src/jtag/core.c b/src/jtag/core.c index 6177c1d..1285040 100644 --- a/src/jtag/core.c +++ b/src/jtag/core.c @@ -61,8 +61,8 @@ static int jtag_error = ERROR_OK; static const char *jtag_event_strings[] = { [JTAG_TRST_ASSERTED] = "TAP reset", + [JTAG_TAP_EVENT_SETUP] = "TAP setup", [JTAG_TAP_EVENT_ENABLE] = "TAP enabled", - [JTAG_TAP_EVENT_POST_RESET] = "TAP post reset", [JTAG_TAP_EVENT_DISABLE] = "TAP disabled", }; @@ -489,7 +489,7 @@ void jtag_add_tlr(void) /* NOTE: order here matches TRST path in jtag_add_reset() */ jtag_call_event_callbacks(JTAG_TRST_ASSERTED); - jtag_notify_reset(); + jtag_notify_event(JTAG_TRST_ASSERTED); } void jtag_add_pathmove(int num_states, const tap_state_t *path) @@ -704,7 +704,7 @@ void jtag_add_reset(int req_tlr_or_trst, int req_srst) * sequence must match jtag_add_tlr(). */ jtag_call_event_callbacks(JTAG_TRST_ASSERTED); - jtag_notify_reset(); + jtag_notify_event(JTAG_TRST_ASSERTED); } } } @@ -1232,6 +1232,7 @@ static int jtag_init_inner(struct command_context_s *cmd_ctx) { jtag_tap_t *tap; int retval; + bool issue_setup = true; LOG_DEBUG("Init JTAG chain"); @@ -1249,13 +1250,21 @@ static int jtag_init_inner(struct command_context_s *cmd_ctx) if (jtag_examine_chain() != ERROR_OK) { LOG_ERROR("Trying to use configured scan chain anyway..."); + issue_setup = false; } if (jtag_validate_ircapture() != ERROR_OK) { LOG_WARNING("Errors during IR capture, continuing anyway..."); + issue_setup = false; } + if (issue_setup) + jtag_notify_event(JTAG_TAP_EVENT_SETUP); + else + LOG_WARNING("Bypassing JTAG setup events due to errors"); + + return ERROR_OK; } diff --git a/src/jtag/jtag.h b/src/jtag/jtag.h index 938d854..f255a70 100644 --- a/src/jtag/jtag.h +++ b/src/jtag/jtag.h @@ -192,23 +192,32 @@ extern unsigned jtag_tap_count(void); /* - * There are three cases when JTAG_TRST_ASSERTED callback is invoked. The - * event is invoked *after* TRST is asserted(or queued rather). It is illegal - * to communicate with the JTAG interface during the callback(as there is - * currently a queue being built). + * - TRST_ASSERTED triggers two sets of callbacks, after operations to + * reset the scan chain -- via TMS+TCK signaling, or deasserting the + * nTRST signal -- are queued: * - * - TMS reset - * - SRST pulls TRST - * - TRST asserted + * + Callbacks in C code fire first, patching internal state + * + Then post-reset event scripts fire ... activating JTAG circuits + * via TCK cycles, exiting SWD mode via TMS sequences, etc * - * TAP activation/deactivation is currently implemented outside the core - * using scripted code that understands the specific router type. + * During those callbacks, scan chain contents have not been validated. + * JTAG operations that address a specific TAP (primarily DR/IR scans) + * must *not* be queued. + * + * - TAP_EVENT_SETUP is reported after TRST_ASSERTED, and after the scan + * chain has been validated. JTAG operations including scans that + * target specific TAPs may be performed. + * + * - TAP_EVENT_ENABLE and TAP_EVENT_DISABLE implement TAP activation and + * deactivation outside the core using scripted code that understands + * the specific JTAG router type. They might be triggered indirectly + * from EVENT_SETUP operations. */ enum jtag_event { JTAG_TRST_ASSERTED, + JTAG_TAP_EVENT_SETUP, JTAG_TAP_EVENT_ENABLE, JTAG_TAP_EVENT_DISABLE, - JTAG_TAP_EVENT_POST_RESET, }; struct jtag_tap_event_action_s @@ -643,8 +652,8 @@ extern void jtag_execute_queue_noclear(void); /// @returns the number of times the scan queue has been flushed int jtag_get_flush_queue_count(void); -/// Notify all TAP's about a TLR reset -void jtag_notify_reset(void); +/// Report Tcl event to all TAPs +void jtag_notify_event(enum jtag_event); /* can be implemented by hw + sw */ diff --git a/src/jtag/tcl.c b/src/jtag/tcl.c index 53c19e1..212be35 100644 --- a/src/jtag/tcl.c +++ b/src/jtag/tcl.c @@ -41,7 +41,8 @@ #endif static const Jim_Nvp nvp_jtag_tap_event[] = { - { .value = JTAG_TAP_EVENT_POST_RESET, .name = "post-reset" }, + { .value = JTAG_TRST_ASSERTED, .name = "post-reset" }, + { .value = JTAG_TAP_EVENT_SETUP, .name = "setup" }, { .value = JTAG_TAP_EVENT_ENABLE, .name = "tap-enable" }, { .value = JTAG_TAP_EVENT_DISABLE, .name = "tap-disable" }, @@ -373,7 +374,7 @@ static void jtag_tap_handle_event(jtag_tap_t *tap, enum jtag_event e) for (jteap = tap->event_action; jteap != NULL; jteap = jteap->next) { if (jteap->event == e) { - LOG_DEBUG("JTAG tap: %s event: %d (%s) action: %s\n", + LOG_DEBUG("JTAG tap: %s event: %d (%s)\n\taction: %s", tap->dotted_name, e, Jim_Nvp_value2name_simple(nvp_jtag_tap_event, e)->name, @@ -384,10 +385,12 @@ static void jtag_tap_handle_event(jtag_tap_t *tap, enum jtag_event e) case JTAG_TAP_EVENT_ENABLE: case JTAG_TAP_EVENT_DISABLE: /* NOTE: we currently assume the handlers - * can't fail. That presumes later code - * will be verifying the scan chains ... + * can't fail. Right here is where we should + * really be verifying the scan chains ... */ tap->enabled = (e == JTAG_TAP_EVENT_ENABLE); + LOG_INFO("JTAG tap: %s %s", tap->dotted_name, + tap->enabled ? "enabled" : "disabled"); break; default: break; @@ -586,13 +589,12 @@ static int jim_jtag_command(Jim_Interp *interp, int argc, Jim_Obj *const *argv) } -void jtag_notify_reset(void) +void jtag_notify_event(enum jtag_event event) { jtag_tap_t *tap; + for (tap = jtag_all_taps(); tap; tap = tap->next_tap) - { - jtag_tap_handle_event(tap, JTAG_TAP_EVENT_POST_RESET); - } + jtag_tap_handle_event(tap, event); } diff --git a/tcl/target/ti_dm355.cfg b/tcl/target/ti_dm355.cfg index b1e19e9..2551c3e 100644 --- a/tcl/target/ti_dm355.cfg +++ b/tcl/target/ti_dm355.cfg @@ -9,11 +9,11 @@ if { [info exists CHIPNAME] } { # TI boards default to EMU0/EMU1 *high* -- ARM and ETB are *disabled* # after JTAG reset until ICEpick is used to route them in. -#set EMU01 "-disable" +set EMU01 "-disable" # With EMU0/EMU1 jumpered *low* ARM and ETB are *enabled* without # needing any ICEpick interaction. -set EMU01 "-enable" +#set EMU01 "-enable" source [find target/icepick.cfg] @@ -50,6 +50,9 @@ if { [info exists JRC_TAPID ] } { } jtag newtap $_CHIPNAME jrc -irlen 6 -irmask 0x3f -expected-id $_JRC_TAPID +jtag configure $_CHIPNAME.jrc -event setup \ + "jtag tapenable $_CHIPNAME.etb; jtag tapenable $_CHIPNAME.arm" + ################ # various symbol definitions, to avoid hard-wiring addresses diff --git a/tcl/target/ti_dm365.cfg b/tcl/target/ti_dm365.cfg index 3a17d1a..e2d29bd 100644 --- a/tcl/target/ti_dm365.cfg +++ b/tcl/target/ti_dm365.cfg @@ -7,16 +7,15 @@ if { [info exists CHIPNAME] } { set _CHIPNAME dm365 } -# -# For now, expect EMU0/EMU1 jumpered LOW (not TI's default) so ARM and ETB -# are enabled without making ICEpick route ARM and ETB into the JTAG chain. -# -# Also note: when running without RTCK before the PLLs are set up, you -# may need to slow the JTAG clock down quite a lot (under 2 MHz). -# +# TI boards default to EMU0/EMU1 *high* -- ARM and ETB are *disabled* +# after JTAG reset until ICEpick is used to route them in. +set EMU01 "-disable" + +# With EMU0/EMU1 jumpered *low* ARM and ETB are *enabled* without +# needing any ICEpick interaction. +#set EMU01 "-enable" + source [find target/icepick.cfg] -set EMU01 "-enable" -#set EMU01 "-disable" # Subsidiary TAP: ARM ETB11, with scan chain for 4K of ETM trace buffer if { [info exists ETB_TAPID ] } { @@ -46,6 +45,9 @@ if { [info exists JRC_TAPID ] } { } jtag newtap $_CHIPNAME jrc -irlen 6 -irmask 0x3f -expected-id $_JRC_TAPID +jtag configure $_CHIPNAME.jrc -event setup \ + "jtag tapenable $_CHIPNAME.etb; jtag tapenable $_CHIPNAME.arm" + ################ # various symbol definitions, to avoid hard-wiring addresses diff --git a/tcl/target/ti_dm6446.cfg b/tcl/target/ti_dm6446.cfg index e96c3e1..4dac3d5 100644 --- a/tcl/target/ti_dm6446.cfg +++ b/tcl/target/ti_dm6446.cfg @@ -7,17 +7,15 @@ if { [info exists CHIPNAME] } { set _CHIPNAME dm6446 } -# -# For now, expect EMU0/EMU1 jumpered LOW (not TI's default) so ARM and ETB -# are enabled without making ICEpick route ARM and ETB into the JTAG chain. -# Override by setting EMU01 to "-disable". -# -# Also note: when running without RTCK before the PLLs are set up, you -# may need to slow the JTAG clock down quite a lot (under 2 MHz). -# +# TI boards default to EMU0/EMU1 *high* -- ARM and ETB are *disabled* +# after JTAG reset until ICEpick is used to route them in. +set EMU01 "-disable" + +# With EMU0/EMU1 jumpered *low* ARM and ETB are *enabled* without +# needing any ICEpick interaction. +#set EMU01 "-enable" + source [find target/icepick.cfg] -set EMU01 "-enable" -#set EMU01 "-disable" # Subsidiary TAP: unknown ... must enable via ICEpick jtag newtap $_CHIPNAME unknown -irlen 8 -disable @@ -57,6 +55,10 @@ if { [info exists JRC_TAPID ] } { } jtag newtap $_CHIPNAME jrc -irlen 6 -irmask 0x3f -expected-id $_JRC_TAPID +jtag configure $_CHIPNAME.jrc -event setup \ + "jtag tapenable $_CHIPNAME.etb; jtag tapenable $_CHIPNAME.arm" + +################ # GDB target: the ARM, using SRAM1 for scratch. SRAM0 (also 8K) # and the ETB memory (4K) are other options, while trace is unused. # Little-endian; use the OpenOCD default. |