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author | dbrownell <dbrownell@b42882b7-edfa-0310-969c-e2dbd0fdcd60> | 2009-10-07 18:51:11 +0000 |
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committer | dbrownell <dbrownell@b42882b7-edfa-0310-969c-e2dbd0fdcd60> | 2009-10-07 18:51:11 +0000 |
commit | 246ff4f6019ed59fe47295b3753728b3e4c0dc40 (patch) | |
tree | 531c138afc77d3ca8e0406edab66bde966f566e0 /src/jtag | |
parent | 7035b37e71c8c8805a2148c7c454537b903b0d51 (diff) | |
download | riscv-openocd-246ff4f6019ed59fe47295b3753728b3e4c0dc40.zip riscv-openocd-246ff4f6019ed59fe47295b3753728b3e4c0dc40.tar.gz riscv-openocd-246ff4f6019ed59fe47295b3753728b3e4c0dc40.tar.bz2 |
Better fix for TAPs violating the JTAG spec for IR-Capture.
Instead of just assuming all IDCODE-deprived TAPs violate the
JTAG spec (they don't!), just require TAPs with such problems
to be declared with proper ircapture/irmask values. Example,
with mask and value of zero.
git-svn-id: svn://svn.berlios.de/openocd/trunk@2823 b42882b7-edfa-0310-969c-e2dbd0fdcd60
Diffstat (limited to 'src/jtag')
-rw-r--r-- | src/jtag/core.c | 34 |
1 files changed, 18 insertions, 16 deletions
diff --git a/src/jtag/core.c b/src/jtag/core.c index 0b752ea..e6bde51 100644 --- a/src/jtag/core.c +++ b/src/jtag/core.c @@ -1108,22 +1108,24 @@ static int jtag_validate_ircapture(void) break; } - if (tap->hasidcode) - { - /* Validate the two LSBs, which must be 01 per JTAG spec. - * REVISIT we might be able to verify some MSBs too, using - * ircapture/irmask attributes. - */ - val = buf_get_u32(ir_test, chain_pos, tap->ir_length); - if ((val & 0x3) != 1) { - LOG_ERROR("%s: IR capture error; saw 0x%0*x not 0x..1", - jtag_tap_name(tap), - (tap->ir_length + 7) / tap->ir_length, - val); - - retval = ERROR_JTAG_INIT_FAILED; - goto done; - } + /* Validate the two LSBs, which must be 01 per JTAG spec. + * + * Or ... more bits could be provided by TAP declaration. + * Plus, some taps (notably in i.MX series chips) violate + * this part of the JTAG spec, so their capture mask/value + * attributes might disable this test. + */ + val = buf_get_u32(ir_test, chain_pos, tap->ir_length); + if ((val & tap->ir_capture_mask) != tap->ir_capture_value) { + LOG_ERROR("%s: IR capture error; saw 0x%0*x not 0x%0*x", + jtag_tap_name(tap), + (tap->ir_length + 7) / tap->ir_length, + val, + (tap->ir_length + 7) / tap->ir_length, + tap->ir_capture_value); + + retval = ERROR_JTAG_INIT_FAILED; + goto done; } LOG_DEBUG("%s: IR capture 0x%0*x", jtag_tap_name(tap), (tap->ir_length + 7) / tap->ir_length, val); |