Re: Reboot Command Makes kernel to hang (MPC8560)
Hi Koller Kumar Thanks for ur reply. Is there a way to reset the full chip (MPC8560) whenever core reset occurs (using hardware or software) ?? Regards Haroun Ansari M A - Original Message - From: Kumar Gala [EMAIL PROTECTED] To: Clemens Koller [EMAIL PROTECTED] Cc: Ansari [EMAIL PROTECTED]; linuxppc-embedded@ozlabs.org Sent: Tuesday, July 31, 2007 7:41 PM Subject: Re: Reboot Command Makes kernel to hang (MPC8560) 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 __ RD 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
Re: Reboot Command Makes kernel to hang (MPC8560)
On Aug 2, 2007, at 1:48 AM, Ansari wrote: Hi Koller Kumar Thanks for ur reply. Is there a way to reset the full chip (MPC8560) whenever core reset occurs (using hardware or software) ?? what do you mean by core reset? - k ___ Linuxppc-embedded mailing list Linuxppc-embedded@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-embedded
Re: Reboot Command Makes kernel to hang (MPC8560)
Hi, Ansari! Ansari schrieb: Hi Koller Kumar Thanks for ur reply. Is there a way to reset the full chip (MPC8560) whenever core reset occurs (using hardware or software) ?? I recommend you to have a look at i.e. the MPC8540ADS reference design (as an example, the 8560 should be similar) to see how the reset signals are realized. I didn't run into problems with the reset circuitry. u-boot resets my thing by issung a reset and linux does the same when I do a shutdown -r now or similar thing. Read the code at these places what's happening there. AFAICT this is not done by enabling the Watchdog and wait until it triggers. (Hence, that would be interesting to try...) In your case I would have a look at the ramdisk code to see where it/what fails in the first place. Regards, -- Clemens Koller __ RD 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
Re: Reboot Command Makes kernel to hang (MPC8560)
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) 2. Even same reboot command works fine for MPC8540 Processor ?. 3. what are the factors that makes ramdisk hangs . When its uncompressing ? Regards Haroun Ansari - Original Message - From: Kumar Gala [EMAIL PROTECTED] To: Ansari [EMAIL PROTECTED] Cc: linuxppc-embedded@ozlabs.org Sent: Friday, July 27, 2007 1:21 AM Subject: Re: Reboot Command Makes kernel to hang (MPC8560) On Jul 26, 2007, at 1:55 AM, Ansari wrote: Hi all, Processor (MPC8560) Whenever reboot command is given in the linux console. The processor gets reset and it loads bootloader , kernel and when uncompressing the ramdisk it gets hang. The sample log is given below. Any u please tell me what are the factors that can makes this to happen. This is very board dependant. The MPC8560 doesn't have a clean way to request reset, and odds are you're only getting the core reset and not the full chip. - k ___ Linuxppc-embedded mailing list Linuxppc-embedded@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-embedded
Re: Reboot Command Makes kernel to hang (MPC8560)
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). 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. 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... 2. Even same reboot command works fine for MPC8540 Processor ?. ...because it doesn't have a cpm ? 3. what are the factors that makes ramdisk hangs . When its uncompressing ? Well, side effects ? Regards, -- Clemens Koller __ RD 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
Re: Reboot Command Makes kernel to hang (MPC8560)
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 __ RD 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
Re: Reboot Command Makes kernel to hang (MPC8560)
On Jul 26, 2007, at 1:55 AM, Ansari wrote: Hi all, Processor (MPC8560) Whenever reboot command is given in the linux console. The processor gets reset and it loads bootloader , kernel and when uncompressing the ramdisk it gets hang. The sample log is given below. Any u please tell me what are the factors that can makes this to happen. This is very board dependant. The MPC8560 doesn't have a clean way to request reset, and odds are you're only getting the core reset and not the full chip. - k ___ Linuxppc-embedded mailing list Linuxppc-embedded@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-embedded
