s3c4510: Read B0SIZE etc. earlier during bus_prepare, so bus_area can return correct values immediately after init

git-svn-id: https://urjtag.svn.sourceforge.net/svnroot/urjtag/trunk@1021 b68d4a1b-bc3d-0410-92ed-d4ac073336b7

jtag/ChangeLog

@@ -3,7 +3,9 @@
     * src/flash/Makefile.am, src/flash/jedec_exp.c, src/flash/detectflash.c,
         configure.ac: Experimental new code for flash detection, to be enabled
         during configuration with --enable-jedec-exp (disabled by default)
-    * src/bus/s3c4510x.c: disable debug output (was enabled in 929..)
+    * src/bus/s3c4510x.c: disable debug output (was enabled in 929..), do a
+        chain_shift_data_registers before trying to read b0size (fixes the
+        old problem of B0SIZE unknown, needed for proper flash detection)
     * include/register.h, src/tap/register.c, src/discovery.c: report if tdo
         seems to be stuck during detect_register_size (ie. "detect").
 

jtag/src/bus/s3c4510x.c

@@ -150,13 +150,6 @@ s3c4510_bus_printinfo( bus_t *bus )
 	printf( _("Samsung S3C4510B compatibile bus driver via BSR (JTAG part No. %d) RCS0=%ubit\n"), i ,dbus_width );        
 }
 
-static void
-s3c4510_bus_prepare( bus_t *bus )
-{
-        part_set_instruction( PART, "EXTEST" );
-        chain_shift_instructions( CHAIN );
-}
-
 static void s3c4510_bus_setup_ctrl( bus_t *bus, int mode ) 
 {
   int k;
@@ -177,6 +170,19 @@ static void s3c4510_bus_setup_ctrl( bus_t *bus, int mode )
   part_set_signal( p, nOE, 1, (mode & (1 << 16)) ? 1 : 0 );
 }
 
+static void
+s3c4510_bus_prepare( bus_t *bus )
+{
+        part_set_instruction( PART, "EXTEST" );
+        chain_shift_instructions( CHAIN );
+
+    /* Do one shift_data_registers to capture current values */
+
+	s3c4510_bus_setup_ctrl( bus, 0x1FFFF );
+	chain_shift_data_registers( chain, 1 );
+}
+
+
 static void
 s3c4510_bus_read_start( bus_t *bus, uint32_t adr )
 {
@@ -288,11 +294,9 @@ s3c4510_bus_area( bus_t *bus, uint32_t adr, bus_area_t *area )
 	area->start = UINT32_C(0x00000000);
 	area->length = UINT64_C(0x100000000);
 
-        // endian = part_get_signal( PART, part_find_signal( PART, "LITTLE" ));
-        b0size0 = part_get_signal( PART, part_find_signal( PART, "B0SIZE0" ));
-        if(b0size0==0) // TODO: try again (initialization problem?)
-            b0size0 = part_get_signal( PART, part_find_signal( PART, "B0SIZE0" ));
-        b0size1 = part_get_signal( PART, part_find_signal( PART, "B0SIZE1" ));
+	// endian = part_get_signal( PART, part_find_signal( PART, "LITTLE" ));
+	b0size0 = part_get_signal( PART, part_find_signal( PART, "B0SIZE0" ));
+	b0size1 = part_get_signal( PART, part_find_signal( PART, "B0SIZE1" ));
 
         switch ((b0size1 << 1) | b0size0) {
                 case 1: