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Fix for BMIPS 

BMIPS always needs 2 additional instructions to reach the core.
Seems there is a 2 instructions fifo between the tap and the core, or it behaves in this way.
No idea of the purpose of this fifo, I can only guess.
Of course function mips32_pracc_clean_text_jump() must add this additional instructions (NOPs).
Only tested on bcm3348..

Change-Id: I3183d3ce865d469d7262ba4b15446e5743a5f1df
Signed-off-by: Salvador Arroyo <salvador@telecable.es>
Reviewed-on: http://openocd.zylin.com/2270
Tested-by: jenkins
Reviewed-by: Kent Brinkley <jkbrinkley.imgtec@gmail.com>
Reviewed-by: Spencer Oliver <spen@spen-soft.co.uk>
This commit is contained in:
Salvador Arroyo 2014-08-24 19:34:08 +02:00 committed by Freddie Chopin
parent 44d2c7b416
commit 7ba0537838
1 changed files with 12 additions and 9 deletions
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21
src/target/mips32_pracc.c
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@ -160,19 +160,22 @@ int mips32_pracc_clean_text_jump(struct mips_ejtag *ejtag_info)
return retval;
}
if (ejtag_info->mode != 0) /* done, queued mode won't work with lexra cores */
if (ejtag_info->mode != 0) /* async mode support only for MIPS ... */
return ERROR_OK;
retval = mips32_pracc_read_ctrl_addr(ejtag_info);
if (retval != ERROR_OK)
return retval;
if (ejtag_info->pa_addr != MIPS32_PRACC_TEXT) { /* LEXRA/BMIPS ?, shift out another NOP */
mips_ejtag_set_instr(ejtag_info, EJTAG_INST_DATA);
mips_ejtag_drscan_32_out(ejtag_info, MIPS32_NOP);
retval = mips32_pracc_finish(ejtag_info);
for (int i = 0; i != 2; i++) {
retval = mips32_pracc_read_ctrl_addr(ejtag_info);
if (retval != ERROR_OK)
return retval;
if (ejtag_info->pa_addr != MIPS32_PRACC_TEXT) { /* LEXRA/BMIPS ?, shift out another NOP, max 2 */
mips_ejtag_set_instr(ejtag_info, EJTAG_INST_DATA);
mips_ejtag_drscan_32_out(ejtag_info, MIPS32_NOP);
retval = mips32_pracc_finish(ejtag_info);
if (retval != ERROR_OK)
return retval;
} else
break;
}
return ERROR_OK;