From mboxrd@z Thu Jan 1 00:00:00 1970 Message-ID: <389AF42D.C62639B0@email.sps.mot.com> Date: Fri, 04 Feb 2000 09:45:49 -0600 From: "Richard Hendricks" MIME-Version: 1.0 To: Alan Mimms CC: Clinton Lam , "Linuxppc-Embedded (E-mail)" Subject: Re: mpc8xx-2.2.13 booting problem References: <2044A9F15B38D211A89900104BD36C02381B4E@thebank.audesi.com> <0002031748410T.00733@alan.corp.packetengines.com> Content-Type: text/plain; charset=us-ascii Sender: owner-linuxppc-embedded@lists.linuxppc.org List-Id: You can either have the TB/DEC run from the oscclk/4, or from the system clock/16. I would assume Linux would use oscclk/4, or 8kHz, and assume that value for its calculations. You'll have to change the funtion that calculates the timeout value. Alan Mimms wrote: > > Sounds like you need to turn on some prescaling for the timebase/decrementer. > If you can't find the required stuff, maybe I can help, but I'm not all THAT > familiar with these cockamamie 8xx processors myself. Perhaps someone else? > > a > > On > Thu, 03 Feb 2000, Clinton Lam wrote: > Alan, > > > > After another 5 hours of debugging, I've narrowed the problem to the > > decrement counter interrupt. For some unknown reasons, the interrupt never > > gets clear. The system just keep looping and waiting for this interrupt to > > be cleared. > > > > In the file time.c (this is the file where all of the timer interrupt code > > is), it mentions something about making an assumption that MBX board is > > running off a 32.768KHz crystal. But the Touchstone board has a 3.57 MHz > > crystal. So, something has to be changed to make this work! Anyone has any > > ideas??? > > > > BTW, the network bootloader is modified from a comercial OS. We use it to > > jump start our project. I don't think we can share the code with everyone, > > sorry... > > > > Regards > > Clinton Lam > > > > > -----Original Message----- > > > From: Alan Mimms [mailto:alan@packetengines.com] > > > Sent: Thursday, February 03, 2000 10:03 AM > > > To: Clinton Lam; Linuxppc-Embedded (E-mail) > > > Subject: Re: mpc8xx-2.2.13 booting problem > > > > > > > > > Clinton, > > > > > > This function enables interrupts. Some bit of hardware is leaving an > > > interrupt asserted permanently, or else your port or your > > > driver for some bit > > > of hardware is not turning off the interrupt request by > > > servicing the interrupt > > > properly. Or, possibly, your 8xx interrupt management is screwed up. > > > > > > One of those explanations is it, just about guaranteed... > > > > > > Luck. > > > a > > > > > > On Thu, 03 Feb 2000, Clinton Lam wrote: > > > > Hi, > > > > > > > > I am new to the embeded linux. I am trying to port > > > mpc8xx-2.2.13 kernel to > > > > our custom board, called Touchstone. It is a reference > > > design based on > > > > mpc823, which has 32 Mbyte of SDRAM, and 4 Mbyte of flash. > > > > > > > > So far, I've developed a network bootloader, which > > > downloads the zImage to > > > > the target. I am at the stage where I can unzip the kernel > > > image to address > > > > location 0x0, and jump to it. Then, inside the routine > > > "start_kernel", I am > > > > able to get the console up and have the linux banner > > > partially displayed at > > > > the cosole. > > > > > > > > However, after some more kernel initialization in > > > "start_kernel", the > > > > program stuck in a routine called "sti()". I've debugged > > > through this > > > > routine (it is an assembly routine) , and it seems that it > > > is looping > > > > forever inside the routine. I know that the routine is > > > trying to set the EE > > > > bit in MSR, and also doing some thing with > > > ppc_n_lost_interrupts, which I > > > > don't quite understand. > > > > > > > > Does anyone have any idea what is wrong with my port? Can > > > someone explain to > > > > me what is the purpose of this "sti()" routine, what are > > > the possible cause > > > > for it to hang? > > > > > > > > Your response is greately appreciated! > > > > > > > > Thanks in advance. > > > > > > > > Clinton Lam > > -- > > Alan Mimms Packet Engines, Inc. Spokane, Washington [99214-0497] > > USA, Earth, Sol, Milky Way, The Local Group, Virgo Supercluster, U0 > > Despite the cost of living, have you noticed how popular it remains? > > -- Steven Wright? > -- > Alan Mimms Packet Engines, Inc. Spokane, Washington [99214-0497] > USA, Earth, Sol, Milky Way, The Local Group, Virgo Supercluster, U0 > Despite the cost of living, have you noticed how popular it remains? > -- Steven Wright? ** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/