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 > [email protected] <javascript:> > -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
