diff options
| -rw-r--r-- | src/target/arm7_9_common.c | 50 |
1 files changed, 34 insertions, 16 deletions
diff --git a/src/target/arm7_9_common.c b/src/target/arm7_9_common.c index 0f8f2638..baf3e45b 100644 --- a/src/target/arm7_9_common.c +++ b/src/target/arm7_9_common.c @@ -11,6 +11,8 @@ * Copyright (C) 2008 by Hongtao Zheng * * hontor@126.com * * * + * Copyright (C) 2009 by David Brownell * + * * * This program is free software; you can redistribute it and/or modify * * it under the terms of the GNU General Public License as published by * * the Free Software Foundation; either version 2 of the License, or * @@ -941,11 +943,11 @@ int arm7_9_poll(struct target *target) int arm7_9_assert_reset(struct target *target) { struct arm7_9_common *arm7_9 = target_to_arm7_9(target); + enum reset_types jtag_reset_config = jtag_get_reset_config(); LOG_DEBUG("target->state: %s", target_state_name(target)); - enum reset_types jtag_reset_config = jtag_get_reset_config(); if (!(jtag_reset_config & RESET_HAS_SRST)) { LOG_ERROR("Can't assert SRST"); @@ -973,28 +975,43 @@ int arm7_9_assert_reset(struct target *target) if (target->reset_halt) { /* - * Some targets do not support communication while SRST is asserted. We need to - * set up the reset vector catch here. + * For targets that don't support communication while SRST is + * asserted, we need to set up the reset vector catch first. * - * If TRST is asserted, then these settings will be reset anyway, so setting them - * here is harmless. + * When we use TRST+SRST and that's equivalent to a power-up + * reset, these settings may well be reset anyway; so setting + * them here won't matter. */ if (arm7_9->has_vector_catch) { - /* program vector catch register to catch reset vector */ - embeddedice_write_reg(&arm7_9->eice_cache->reg_list[EICE_VEC_CATCH], 0x1); + /* program vector catch register to catch reset */ + embeddedice_write_reg(&arm7_9->eice_cache + ->reg_list[EICE_VEC_CATCH], 0x1); - /* extra runtest added as issues were found with certain ARM9 cores (maybe more) - AT91SAM9260 and STR9 */ + /* extra runtest added as issues were found with + * certain ARM9 cores (maybe more) - AT91SAM9260 + * and STR9 + */ jtag_add_runtest(1, jtag_get_end_state()); } else { - /* program watchpoint unit to match on reset vector address */ - embeddedice_write_reg(&arm7_9->eice_cache->reg_list[EICE_W0_ADDR_VALUE], 0x0); - embeddedice_write_reg(&arm7_9->eice_cache->reg_list[EICE_W0_ADDR_MASK], 0x3); - embeddedice_write_reg(&arm7_9->eice_cache->reg_list[EICE_W0_DATA_MASK], 0xffffffff); - embeddedice_write_reg(&arm7_9->eice_cache->reg_list[EICE_W0_CONTROL_VALUE], EICE_W_CTRL_ENABLE); - embeddedice_write_reg(&arm7_9->eice_cache->reg_list[EICE_W0_CONTROL_MASK], ~EICE_W_CTRL_nOPC & 0xff); + /* program watchpoint unit to match on reset vector + * address + */ + embeddedice_write_reg(&arm7_9->eice_cache + ->reg_list[EICE_W0_ADDR_VALUE], 0x0); + embeddedice_write_reg(&arm7_9->eice_cache + ->reg_list[EICE_W0_ADDR_MASK], 0x3); + embeddedice_write_reg(&arm7_9->eice_cache + ->reg_list[EICE_W0_DATA_MASK], + 0xffffffff); + embeddedice_write_reg(&arm7_9->eice_cache + ->reg_list[EICE_W0_CONTROL_VALUE], + EICE_W_CTRL_ENABLE); + embeddedice_write_reg(&arm7_9->eice_cache + ->reg_list[EICE_W0_CONTROL_MASK], + ~EICE_W_CTRL_nOPC & 0xff); } } @@ -1012,9 +1029,10 @@ int arm7_9_assert_reset(struct target *target) register_cache_invalidate(arm7_9->armv4_5_common.core_cache); - if ((target->reset_halt) && ((jtag_reset_config & RESET_SRST_PULLS_TRST) == 0)) + if (target->reset_halt + && !(jtag_reset_config & RESET_SRST_PULLS_TRST)) { - /* debug entry was already prepared in arm7_9_assert_reset() */ + /* debug entry was prepared above */ target->debug_reason = DBG_REASON_DBGRQ; } |