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commit c74ca40e09baebe8b86b1a77ad343f7b8ebde5d6
Author: Ãyvind Harboe <oyv...@zy...>
Date: Mon Jan 11 10:21:56 2010 +0100
zy1000: reset bugfix
flush JTAG FIFO before reset. Fixes RCLK problems observed
w/lpc2148, but really fixes a wider range of problems.
Signed-off-by: Ãyvind Harboe <oyv...@zy...>
diff --git a/src/jtag/zy1000/zy1000.c b/src/jtag/zy1000/zy1000.c
index e66a8b5..9070f2e 100644
--- a/src/jtag/zy1000/zy1000.c
+++ b/src/jtag/zy1000/zy1000.c
@@ -132,6 +132,13 @@ static int zy1000_power_dropout(int *dropout)
void zy1000_reset(int trst, int srst)
{
LOG_DEBUG("zy1000 trst=%d, srst=%d", trst, srst);
+
+ /* flush the JTAG FIFO. Not flushing the queue before messing with
+ * reset has such interesting bugs as causing hard to reproduce
+ * RCLK bugs as RCLK will stop responding when TRST is asserted
+ */
+ waitIdle();
+
if (!srst)
{
ZY1000_POKE(ZY1000_JTAG_BASE + 0x14, 0x00000001);
@@ -156,7 +163,6 @@ void zy1000_reset(int trst, int srst)
if (trst||(srst && (jtag_get_reset_config() & RESET_SRST_PULLS_TRST)))
{
- waitIdle();
/* we're now in the RESET state until trst is deasserted */
ZY1000_POKE(ZY1000_JTAG_BASE + 0x20, TAP_RESET);
} else
-----------------------------------------------------------------------
Summary of changes:
src/jtag/zy1000/zy1000.c | 8 +++++++-
1 files changed, 7 insertions(+), 1 deletions(-)
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