+ pci_dev_t bdf;
+ ulong bootcount;
+
+ /*
+ * Check if the PEX switch is detected (somtimes its not available
+ * on the PCIe bus). In this case, try to recover by issuing a
+ * soft-reset or even a power-cycle, depending on the bootcounter
+ * value.
+ */
+ bdf = pci_find_device(PCI_VENDOR_ID_PLX, 0x8619, 0);
+ if (bdf == -1) {
+ unsigned long start_time = get_timer(0);
+ u8 i2c_buf[8];
+ int ret;
+
+ /* PEX switch not found! */
+ bootcount = bootcount_load();
+ printf("Failed to find PLX PEX-switch (bootcount=%ld)\n",
+ bootcount);
+
+ /*
+ * The user can exit this boot-loop in the error case by
+ * hitting Ctrl-C. So wait some time for this key here.
+ */
+ printf("Continue booting with Ctrl-C, otherwise rebooting\n");
+ do {
+ /* Handle control-c and timeouts */
+ if (ctrlc()) {
+ printf("PEX error boot-loop aborted!\n");
+ return 0;
+ }
+ } while (get_timer(start_time) < ABORT_TIMEOUT);
+
+
+ /*
+ * At this stage the bootcounter has not been incremented
+ * yet. We need to do this manually here to get an actually
+ * working bootcounter in this error case.
+ */
+ bootcount_inc();
+
+ if (bootcount > PEX_SWITCH_NOT_FOUNT_LIMIT) {
+ printf("Issuing power-switch via uC!\n");
+
+ printf("Issuing power-switch via uC!\n");
+ i2c_set_bus_num(STM_I2C_BUS);
+ i2c_buf[0] = STM_I2C_ADDR << 1;
+ i2c_buf[1] = 0xc5; /* cmd */
+ i2c_buf[2] = 0x01; /* enable */
+ /* Delay before reboot */
+ i2c_buf[3] = REBOOT_DELAY & 0x00ff;
+ i2c_buf[4] = (REBOOT_DELAY & 0xff00) >> 8;
+ /* Delay before shutdown */
+ i2c_buf[5] = 0x00;
+ i2c_buf[6] = 0x00;
+ i2c_buf[7] = crc8(0x72, &i2c_buf[0], 7);
+
+ ret = i2c_write(STM_I2C_ADDR, 0, 0, &i2c_buf[1], 7);
+ if (ret) {
+ printf("I2C write error (ret=%d)\n", ret);
+ printf("Issuing soft-reset...\n");
+ /* default handling: SOFT reset */
+ do_reset(NULL, 0, 0, NULL);
+ }
+
+ /* Wait for power-cycle to occur... */
+ printf("Waiting for power-cycle via uC...\n");
+ while (1)
+ ;
+ } else {
+ printf("Issuing soft-reset...\n");
+ /* default handling: SOFT reset */
+ do_reset(NULL, 0, 0, NULL);
+ }
+ }
+
+ return 0;