jtag: add '-ignore-version' option

Add a "-ignore-version" to "jtag newtap" which makes the IDCODE
comparison logic optionally ignore version differences.

Update the "scan_chain" command to illustrate this by showing
the "*" character instead of the (ignored) version nibble.

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
This commit is contained in:
David Brownell 2009-12-14 15:55:51 -08:00
parent 6f929dbd93
commit af79925eb1
4 changed files with 44 additions and 6 deletions

View File

@ -2763,6 +2763,12 @@ are provided in vendors' chip documentation, usually a technical
reference manual. Sometimes you may need to probe the JTAG
hardware to find these values.
@xref{Autoprobing}.
@item @code{-ignore-version}
@*Specify this to ignore the JTAG version field in the @code{-expected-id}
option. When vendors put out multiple versions of a chip, or use the same
JTAG-level ID for several largely-compatible chips, it may be more practical
to ignore the version field than to update config files to handle all of
the various chip IDs.
@item @code{-ircapture} @var{NUMBER}
@*The bit pattern loaded by the TAP into the JTAG shift register
on entry to the @sc{ircapture} state, such as 0x01.

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@ -958,16 +958,25 @@ static bool jtag_examine_chain_end(uint8_t *idcodes, unsigned count, unsigned ma
static bool jtag_examine_chain_match_tap(const struct jtag_tap *tap)
{
uint32_t idcode = tap->idcode;
/* ignore expected BYPASS codes; warn otherwise */
if (0 == tap->expected_ids_cnt && !tap->idcode)
if (0 == tap->expected_ids_cnt && !idcode)
return true;
/* optionally ignore the JTAG version field */
uint32_t mask = tap->ignore_version ? ~(0xff << 24) : ~0;
idcode &= mask;
/* Loop over the expected identification codes and test for a match */
unsigned ii, limit = tap->expected_ids_cnt;
for (ii = 0; ii < limit; ii++)
{
if (tap->idcode == tap->expected_ids[ii])
uint32_t expected = tap->expected_ids[ii] & mask;
if (idcode == expected)
return true;
/* treat "-expected-id 0" as a "don't-warn" wildcard */

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@ -156,6 +156,9 @@ struct jtag_tap {
/// Number of expected identification codes
uint8_t expected_ids_cnt;
/// Flag saying whether to ignore version field in expected_ids[]
bool ignore_version;
/// current instruction
uint8_t* cur_instr;
/// Bypass register selected

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@ -454,6 +454,7 @@ static int jim_newtap_expected_id(Jim_Nvp *n, Jim_GetOptInfo *goi,
#define NTAP_OPT_ENABLED 3
#define NTAP_OPT_DISABLED 4
#define NTAP_OPT_EXPECTED_ID 5
#define NTAP_OPT_VERSION 6
static int jim_newtap_ir_param(Jim_Nvp *n, Jim_GetOptInfo *goi,
struct jtag_tap *pTap)
@ -520,6 +521,7 @@ static int jim_newtap_cmd(Jim_GetOptInfo *goi)
{ .name = "-enable" , .value = NTAP_OPT_ENABLED },
{ .name = "-disable" , .value = NTAP_OPT_DISABLED },
{ .name = "-expected-id" , .value = NTAP_OPT_EXPECTED_ID },
{ .name = "-ignore-version" , .value = NTAP_OPT_VERSION },
{ .name = NULL , .value = -1 },
};
@ -595,6 +597,9 @@ static int jim_newtap_cmd(Jim_GetOptInfo *goi)
return e;
}
break;
case NTAP_OPT_VERSION:
pTap->ignore_version = true;
break;
} /* switch (n->value) */
} /* while (goi->argc) */
@ -1013,6 +1018,7 @@ COMMAND_HANDLER(handle_interface_command)
COMMAND_HANDLER(handle_scan_chain_command)
{
struct jtag_tap *tap;
char expected_id[12];
tap = jtag_all_taps();
command_print(CMD_CTX, " TapName | Enabled | IdCode Expected IrLen IrCap IrMask Instr ");
@ -1020,25 +1026,39 @@ COMMAND_HANDLER(handle_scan_chain_command)
while (tap) {
uint32_t expected, expected_mask, cur_instr, ii;
snprintf(expected_id, sizeof expected_id, "0x%08x",
(unsigned)((tap->expected_ids_cnt > 0)
? tap->expected_ids[0]
: 0));
if (tap->ignore_version)
expected_id[2] = '*';
expected = buf_get_u32(tap->expected, 0, tap->ir_length);
expected_mask = buf_get_u32(tap->expected_mask, 0, tap->ir_length);
cur_instr = buf_get_u32(tap->cur_instr, 0, tap->ir_length);
command_print(CMD_CTX,
"%2d | %-18s | %c | 0x%08x | 0x%08x | 0x%02x | 0x%02x | 0x%02x | 0x%02x",
"%2d | %-18s | %c | 0x%08x | %s | 0x%02x | 0x%02x | 0x%02x | 0x%02x",
tap->abs_chain_position,
tap->dotted_name,
tap->enabled ? 'Y' : 'n',
(unsigned int)(tap->idcode),
(unsigned int)(tap->expected_ids_cnt > 0 ? tap->expected_ids[0] : 0),
expected_id,
(unsigned int)(tap->ir_length),
(unsigned int)(expected),
(unsigned int)(expected_mask),
(unsigned int)(cur_instr));
for (ii = 1; ii < tap->expected_ids_cnt; ii++) {
command_print(CMD_CTX, " | | | | 0x%08x | | | | ",
(unsigned int)(tap->expected_ids[ii]));
snprintf(expected_id, sizeof expected_id, "0x%08x",
(unsigned) tap->expected_ids[1]);
if (tap->ignore_version)
expected_id[2] = '*';
command_print(CMD_CTX,
" | | | | %s | | | | ",
expected_id);
}
tap = tap->next_tap;