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/* Remote debugging interface for JTAG debugging protocol.
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/* Remote debugging interface for JTAG debugging protocol.
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JTAG connects to or1k target ops. See or1k-tdep.c
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Copyright 1993-1995, 2000 Free Software Foundation, Inc.
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Copyright 1993-1995, 2000 Free Software Foundation, Inc.
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Contributed by Cygnus Support. Written by Marko Mlinar
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Contributed by Cygnus Support. Written by Marko Mlinar
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<markom@opencores.org>
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<markom@opencores.org>
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This file is part of GDB.
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This file is part of GDB.
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Line 62... |
static int chain_has_rw[] = { 0, 1, 0, 0, 1 };
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static int chain_has_rw[] = { 0, 1, 0, 0, 1 };
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/* *INDENT-OFF* */
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/* *INDENT-OFF* */
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/* Currently selected scan chain - just to prevent unnecessary
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/* Currently selected scan chain - just to prevent unnecessary
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transfers. */
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transfers. */
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static int current_chain;
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static int current_chain;
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/* Designates whether we are in SELECT_DR state, otherwise in
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/* Designates whether we are in SELECT_DR state, otherwise in
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RUN TEST/IDLE */
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RUN TEST/IDLE */
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static int select_dr = 0;
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static int select_dr = 0;
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Line 75... |
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/* Crc of current read or written data. */
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/* Crc of current read or written data. */
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static int crc_r, crc_w = 0;
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static int crc_r, crc_w = 0;
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/* Generates new crc, sending in new bit input_bit */
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/* Generates new crc, sending in new bit input_bit */
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static int
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static int
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crc_calc (int crc, int input_bit)
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crc_calc (int crc, int input_bit)
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{
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{
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int c;
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int c;
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int new_crc;
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int new_crc;
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Line 89... |
d = input_bit&1;
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d = input_bit&1;
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c = crc;
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c = crc;
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/* Move queue left. */
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/* Move queue left. */
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new_crc = crc << 1;
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new_crc = crc << 1;
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/* Mask upper five bits. */
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/* Mask upper five bits. */
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new_crc &= 0xF8;
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new_crc &= 0xF8;
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/* Set lower three bits */
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/* Set lower three bits */
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new_crc |= (d ^ ((c >> 7)&1));
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new_crc |= (d ^ ((c >> 7)&1));
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Line 233... |
for (retry = 0; retry < NUM_RETRIES; retry++)
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for (retry = 0; retry < NUM_RETRIES; retry++)
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{
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{
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jp1_write_JTAG (0); /* CAPTURE_DR */
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jp1_write_JTAG (0); /* CAPTURE_DR */
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jp1_write_JTAG (0); /* SHIFT_DR */
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jp1_write_JTAG (0); /* SHIFT_DR */
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crc_w = 0;
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crc_w = 0;
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/* write addr */
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/* write addr */
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jp1_write_stream (regno, chain_addr_size[current_chain], 0);
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jp1_write_stream (regno, chain_addr_size[current_chain], 0);
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/* write (R/W=1) - we tested that previously. */
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/* write (R/W=1) - we tested that previously. */
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jp1_write_JTAG (2);
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jp1_write_JTAG (2);
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/* write data */
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/* write data */
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jp1_write_stream (data, chain_data_size[current_chain], 0);
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jp1_write_stream (data, chain_data_size[current_chain], 0);
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if (chain_has_crc[current_chain])
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if (chain_has_crc[current_chain])
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{
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{
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crc_write = crc_w;
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crc_write = crc_w;
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/* write CRC, EXIT1_DR */
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/* write CRC, EXIT1_DR */
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crc_read = jp1_read_stream (crc_write, CRC_SIZE, 1);
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crc_read = jp1_read_stream (crc_write, CRC_SIZE, 1);
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}
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}
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jp1_write_JTAG (1); /* UPDATE_DR */
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jp1_write_JTAG (1); /* UPDATE_DR */
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/* Did JTAG receive packet correctly? */
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/* Did JTAG receive packet correctly? */
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if (chain_has_crc[current_chain])
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if (chain_has_crc[current_chain])
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crc_ok = jp1_read_JTAG ();
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crc_ok = jp1_read_JTAG ();
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jp1_write_JTAG (1); /* SELECT_DR */
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jp1_write_JTAG (1); /* SELECT_DR */
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if (chain_has_crc[current_chain])
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if (chain_has_crc[current_chain])
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Line 284... |
for (retry = 0; retry < NUM_RETRIES; retry++)
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for (retry = 0; retry < NUM_RETRIES; retry++)
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{
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{
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jp1_write_JTAG (0); /* CAPTURE_DR */
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jp1_write_JTAG (0); /* CAPTURE_DR */
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jp1_write_JTAG (0); /* SHIFT_DR */
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jp1_write_JTAG (0); /* SHIFT_DR */
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crc_w = 0;
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crc_w = 0;
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/* write addr */
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/* write addr */
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jp1_write_stream (regno, chain_addr_size[current_chain], 0);
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jp1_write_stream (regno, chain_addr_size[current_chain], 0);
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/* read (R/W=0) */
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/* read (R/W=0) */
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if (chain_has_rw[current_chain])
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if (chain_has_rw[current_chain])
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jp1_write_JTAG (0);
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jp1_write_JTAG (0);
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if (chain_has_crc[current_chain])
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if (chain_has_crc[current_chain])
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{
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{
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crc_r = 0;
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crc_r = 0;
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/* data = 0 */
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/* data = 0 */
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data = jp1_read_stream (0, chain_data_size[current_chain], 0);
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data = jp1_read_stream (0, chain_data_size[current_chain], 0);
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crc_write = crc_w;
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crc_write = crc_w;
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crc_actual_read = crc_read;
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crc_actual_read = crc_read;
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/* Send my crc, EXIT1_DR */
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/* Send my crc, EXIT1_DR */
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crc_read = jp1_read_stream (crc_write, CRC_SIZE, 1);
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crc_read = jp1_read_stream (crc_write, CRC_SIZE, 1);
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}
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}
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jp1_write_JTAG (1); /* UPDATE_DR */
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jp1_write_JTAG (1); /* UPDATE_DR */
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/* Did JTAG receive packet correctly? */
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/* Did JTAG receive packet correctly? */
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if (chain_has_crc[current_chain])
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if (chain_has_crc[current_chain])
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crc_ok = jp1_read_JTAG ();
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crc_ok = jp1_read_JTAG ();
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jp1_write_JTAG (1); /* SELECT_DR */
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jp1_write_JTAG (1); /* SELECT_DR */
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if (chain_has_crc[current_chain])
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if (chain_has_crc[current_chain])
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Line 334... |
if (!chain_is_valid[chain])
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if (!chain_is_valid[chain])
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error ("Chain not valid.");
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error ("Chain not valid.");
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current_chain = chain;
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current_chain = chain;
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jp1_prepare_control ();
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jp1_prepare_control ();
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jp1_write_JTAG (0); /* CAPTURE_IR */
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jp1_write_JTAG (0); /* SHIFT_IR */
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/* write data, EXIT1_IR */
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jp1_write_stream (JI_CHAIN_SELECT, JI_SIZE, 4);
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jp1_write_JTAG (1); /* UPDATE_IR */
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jp1_write_JTAG (1); /* SELECT_DR */
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jp1_write_JTAG (0); /* CAPTURE_DR */
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jp1_write_JTAG (0); /* SHIFT_DR */
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/* write data, EXIT1_DR */
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jp1_write_stream (chain, SC_SIZE, 1);
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jp1_write_stream (chain, SC_SIZE, 1);
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jp1_write_JTAG (1); /* UPDATE_DR */
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jp1_write_JTAG (1); /* SELECT_DR */
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/* Now we have to go out of SELECT_CHAIN mode. */
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jp1_write_JTAG (1); /* SELECT_IR */
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jp1_write_JTAG (0); /* CAPTURE_IR */
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jp1_write_JTAG (0); /* SHIFT_IR */
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/* write data, EXIT1_IR */
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jp1_write_stream (JI_DEBUG, JI_SIZE,1 );
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jp1_write_JTAG (1); /* UPDATE_IR */
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jp1_write_JTAG (1); /* SELECT_DR */
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select_dr = 1;
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}
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}
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}
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}
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/* Initialize a new connection to the or1k board, and make sure we are
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/* Initialize a new connection to the or1k board, and make sure we are
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really connected. */
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really connected. */
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| Line 340... |
Line 382... |
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if (args == 0)
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if (args == 0)
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error ( "To open a or1k remote debugging connection, you need to specify what parallel\n"
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error ( "To open a or1k remote debugging connection, you need to specify what parallel\n"
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"port device is attached to the target board (e.g., /dev/lp0).\n");
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"port device is attached to the target board (e.g., /dev/lp0).\n");
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/* Parse the serial port name. */
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/* Parse the port name. */
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if ((argv = buildargv (args)) == NULL)
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if ((argv = buildargv (args)) == NULL)
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nomem (0);
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nomem (0);
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port_name = strsave (argv[0]);
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port_name = strsave (argv[0]);
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make_cleanup_freeargv (argv);
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make_cleanup_freeargv (argv);
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