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more jtag_examine() checks. catch errors during first 640 bits. 

git-svn-id: svn://svn.berlios.de/openocd/trunk@881 b42882b7-edfa-0310-969c-e2dbd0fdcd60
This commit is contained in:
oharboe 2008-07-29 14:58:04 +00:00
parent 530057a846
commit 984dd0635c
1 changed files with 20 additions and 1 deletions
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21
src/jtag/jtag.c
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@ -1371,7 +1371,26 @@ int jtag_examine_chain()
if (idcode == 0x000000FF)
{
/* End of chain (invalid manufacturer ID) */
/* End of chain (invalid manufacturer ID)
*
* The JTAG examine is the very first thing that happens
*
* A single JTAG device requires only 64 bits to be read back correctly.
*
* The code below adds a check that the rest of the data scanned (640 bits)
* are all as expected. This helps diagnose/catch problems with the JTAG chain
*
* earlier and gives more helpful/explicit error messages.
*/
for (bit_count += 32; bit_count < (JTAG_MAX_CHAIN_SIZE * 32) - 31;bit_count += 32)
{
idcode = buf_get_u32(idcode_buffer, bit_count, 32);
if (idcode != 0x000000FF)
{
LOG_WARNING("Unexpected idcode after end of chain! 0x%08x", idcode);
}
}
break;
}