All of the LCD_DATA[] pins, as shown in the SRM And the schematic. On 5/5/2014 2:00 AM, Udayanto Dwi Atmojo wrote: > Hi there, > > Thanks for the answer, Charles. Another question if you dont mind, you > mentioned that All of the lcd/hdmi pins are used, so does it mean that > P8_27-P8_30 are also used for boot process? I didn't see those pins being > included as the boot pins in the BB SRM docs. > > Cheers, > Udayanto > > On Wednesday, April 30, 2014 11:10:14 PM UTC+12, Charles Steinkuehler wrote: >> >> On 4/30/2014 4:13 AM, Udayanto Dwi Atmojo wrote: >>> >>> Hi, >>> >>> The BB itself has its HDMI disabled, thus I assume there's no >> conflicting >>> pins when using the cape. The cape itself utilizes P8_01, P8_02, P8_27 >>> until P8_34 and P9_01, P9_02, and P9_21 until P9_28. The cape gets its >>> power not from the power adapter from the BB but from another power >> supply, >>> thus it doesn't absorb power from the BB at all. But even with having >> the >>> cape unpowered, the BB still cant finish booting the kernel. If it >> somehow >>> adjusting boot mode, which pin number that (if any being used by the >> cape) >>> is being used by the BB for kernel booting? >> >> All of the LCD/HDMI pins are used to set the boot mode and cannot be >> driven until after reset goes high unless you are intentionally trying >> to change the boot mode. >> >> This is covered in the SRM, see section 8.1.1 "LCD Pins": >> >> * These pins are also the SYSBOOT pins. DO NOT drive them before the >> SYS_RESETN signal goes high. If you do, the board may not boot because >> you would be changing the boot order of the processor. >> >> More details are available in 8.3.1 "Boot Pins" and on the schematic. >> >> -- >> Charles Steinkuehler >> cha...@steinkuehler.net <javascript:> >> >
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