On 01/18/2012 04:16 AM, Norbert van Bolhuis wrote: > Yes this is it! > You mentioned mpc8313erdb bug before, I guess you had to mention it > twice before > I looked at mpc8313erdb bug description. > > The mpc8313erdb bug is described as follows: > > 3.5 Power management control (PMC) registers cannot be > accessed? > The PMC registers range from IMMR + 0x0B00 to IMMR + 0x0BFF. When this > area is accessed in u-boot, > the RDB hangs up. It appears that the PMC block is related to the JTAG > interface; TRST must not be pulled > down for normal operation of the PMC block. Possible workarounds are as > follows: > • Attach a debugger to drive TRST high during normal operation. > • Remove the pull-down resistor (R37) for TRST. Although this tested on > some RDBs without any > problem, it violates the hardware specification. If it does not work on > your RDB, use another workaround. > > > I guess this is an MPC8313 problem rather than an MPC8313E-RDB problem ? > and I would expect it to be mentioned in MPC8313E Errata (which isn't the > case).
It is mentioned in the MPC8313E manual (4.2.2 step #10) that TRST must not be asserted except when PORESET is asserted. The mpc8313erdb bug was that the board was not complying with this. -Scott _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
