jtag: drivers: sysfsgpio, bcm2835gpio: remove requirement to have trst or srst

[openocd.git] / src / jtag / drivers / bcm2835gpio.c

diff --git a/src/jtag/drivers/bcm2835gpio.c b/src/jtag/drivers/bcm2835gpio.c
index e1cc56c24a594cec2f3c2c9dcdc2d7d6aa05af60..a4d0a1c8e7e04a93b2f19c2079649975084e4f47 100644 (file)
--- a/src/jtag/drivers/bcm2835gpio.c
+++ b/src/jtag/drivers/bcm2835gpio.c
@@ -16,9 +16,7 @@
  *   GNU General Public License for more details.                          *
  *                                                                         *
  *   You should have received a copy of the GNU General Public License     *
- *   along with this program; if not, write to the                         *
- *   Free Software Foundation, Inc.,                                       *
- *   51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.           *
+ *   along with this program.  If not, see <http://www.gnu.org/licenses/>. *
  ***************************************************************************/
 
 #ifdef HAVE_CONFIG_H
@@ -434,10 +432,6 @@ static int bcm2835gpio_init(void)
                        LOG_INFO("JTAG and SWD modes enabled");
                else
                        LOG_INFO("JTAG only mode enabled (specify swclk and swdio gpio to add SWD mode)");
-               if (!is_gpio_valid(trst_gpio) && !is_gpio_valid(srst_gpio)) {
-                       LOG_ERROR("Require at least one of trst or srst gpios to be specified");
-                       return ERROR_JTAG_INIT_FAILED;
-               }
        } else if (bcm2835gpio_swd_mode_possible()) {
                LOG_INFO("SWD only mode enabled (specify tck, tms, tdi and tdo gpios to add JTAG mode)");
        } else {
@@ -470,8 +464,8 @@ static int bcm2835gpio_init(void)
                return ERROR_JTAG_INIT_FAILED;
        }
 
-       /* set 16mA drive strength */
-       pads_base[BCM2835_PADS_GPIO_0_27_OFFSET] = 0x5a000018 + 7;
+       /* set 4mA drive strength, slew rate limited, hysteresis on */
+       pads_base[BCM2835_PADS_GPIO_0_27_OFFSET] = 0x5a000008 + 1;
 
        tdo_gpio_mode = MODE_GPIO(tdo_gpio);
        tdi_gpio_mode = MODE_GPIO(tdi_gpio);