fw/boot/boot.c (boot_loader): removed description of IDBG-specific power

sensing.

fw/boot/boot.c

@@ -186,30 +186,6 @@ static void boot_loader(void)
 
 	printk("%s #%u\n", build_date, build_number);
 
-	/*
-	 * Very weakly pull SDA down and disable all pull-ups.
-	 *
-	 * We use SDA as a system power presence detector. When I2C is idle,
-	 * SDA is kept high. This is accomplished with pull-ups in the system.
-	 * We can therefore detect if IO_3V3 is any good by checking whether
-	 * SDA is high.
-	 *
-	 * This should work even without our own pull-down. However, when the
-	 * IDBG board is operating standalone (or, generally, if SDA isn't
-	 * connected), SDA would float. We therefore have to pull it down a
-	 * little.
-	 */
-
-	/*
-	 * Ben variant:
-	 *
-	 * We use exactly the same logic as on GTA01/02, but with different
-	 * signals. P0_1 (I2C_SDA_PULL) and P0_2 (I2C_SDA) both connect to
-	 * +V3.3, with a 1 kOhm resistor on P0_1. If the Ben is not powered, we
-	 * can therefore pull +V3.3 to GND, and detect this condition. As on
-	 * the GTA01/02, once the system is powered up, IDBG exits this loop.
-	 */
-
 	PLATFORM_SETUP;
 
 	dfu_init();