bfin: revert chain_system_reset update as this wasnt supposed to be part of the token commit, and this isnt quite done yet

git-svn-id: https://urjtag.svn.sourceforge.net/svnroot/urjtag/trunk@1935 b68d4a1b-bc3d-0410-92ed-d4ac073336b7

urjtag/src/bfin/bfin.c

@@ -23,7 +23,6 @@
 #include <stdlib.h>
 #include <string.h>
 #include <time.h>
-#include <unistd.h>
 
 #include <urjtag/chain.h>
 #include <urjtag/tap_state.h>
@@ -1538,41 +1537,13 @@ chain_system_reset (urj_chain_t *chain)
     p0 = part_get_p0 (chain, chain->main_part);
     r0 = part_get_r0 (chain, chain->main_part);
 
-    /*
-     * Flush all system events like cache line fills.  Otherwise,
-     * when we reset the system side, any events that the core was
-     * waiting on no longer exist, and the core hangs.
-     */
-    part_emuir_set (chain, chain->main_part, INSN_SSYNC, URJ_CHAIN_EXITMODE_IDLE);
-
-    /* Write 0x7 to SWRST to start system reset. */
     part_set_p0 (chain, chain->main_part, SWRST);
     part_set_r0 (chain, chain->main_part, 0x7);
     part_emuir_set (chain, chain->main_part, gen_store16_offset (REG_P0, 0, REG_R0), URJ_CHAIN_EXITMODE_IDLE);
-
-    /*
-     * Delay at least 10 SCLKs instead of doing an SSYNC insn.
-     * Since the system is being reset, the sync signal might
-     * not be asserted, and so the core hangs waiting for it.
-     * The magic "10" number was given to us by ADI designers
-     * who looked at the schematic and ran some simulations.
-     */
-    usleep (100);
-
-    /* Write 0x0 to SWRST to stop system reset. */
+    part_emuir_set (chain, chain->main_part, INSN_SSYNC, URJ_CHAIN_EXITMODE_IDLE);
     part_set_r0 (chain, chain->main_part, 0);
     part_emuir_set (chain, chain->main_part, gen_store16_offset (REG_P0, 0, REG_R0), URJ_CHAIN_EXITMODE_IDLE);
-
-    /* Delay at least 1 SCLK; see comment above for more info. */
-    usleep (100);
-
-    /*
-     * Clear software reset status bit to workaround some bootrom
-     * bugs.  Specifically, the BF526-0.0 will crash when starting
-     * up if this is set.  Should be harmless to everyone else other
-     * than the bit in SWRST is always cleared ...
-     */
-//    part_set_p0 (chain, chain->main_part, SWRST + 4); /* SYSCR */
+    part_emuir_set (chain, chain->main_part, INSN_SSYNC, URJ_CHAIN_EXITMODE_IDLE);
 
     part_set_p0 (chain, chain->main_part, p0);
     part_set_r0 (chain, chain->main_part, r0);