On Jul 31, 2007, at 6:44 AM, Clemens Koller wrote: > Hi, Ansari! > > Ansari schrieb: >> Hi Kumar, >> First of all thanks for ur reply . >> Even i went through the linux source . And i have observe that the >> reboot command used to hard reset the core . I have few doubts can >> u please clarify me. >> 1. Is there any way to reset the full chip with out using any >> external signal (MPC8560) ? (like any register that can be used >> for reseting the processor) > > I RTFM: > It should be the bits RST[1:0] in the Debug Control Register 0 > (DBCR0).
This only resets the core on the 8560. > I didn't find details how the external signals are affected: > HRESET_REQ# and friends. > The HRESET_REQ# is usually fed back to the CPU's HRESET#. > So if the HRESET_REQ# gets asserted by writing to above registers > it should really bring > down the CPU, it's internal as well as it's external components, > which are usually > connected to a replication of that signal. This is roughly correct. The only way on 8560 to generate HRESET_REQ# is to cause a core watchdog timeout. > However the existence of cpm2_reset() and a qe_reset() (QuiccEngine?) > in the code tells me that the above expectations could be wrong. > > Would be nice to have that verified by some hardware guys from > freescale... cpm2_reset/qe_reset are more related to SW than any HW reset. > >> 2. Even same reboot command works fine for MPC8540 Processor ?. > > ...because it doesn't have a cpm ? That's more luck than anything else. >> 3. what are the factors that makes ramdisk hangs . When its >> uncompressing ? > > Well, side effects ? > > Regards, > -- > Clemens Koller > __________________________________ > R&D Imaging Devices > Anagramm GmbH > Rupert-Mayer-Straße 45/1 > Linhof Werksgelände > D-81379 München > Tel.089-741518-50 > Fax 089-741518-19 > http://www.anagramm-technology.com _______________________________________________ Linuxppc-embedded mailing list Linuxppc-embedded@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-embedded