* Initialization of Timer Clock on the MPC8260 @ 2004-12-14 23:07 annamaya 2004-12-15 16:28 ` Wolfgang Denk 0 siblings, 1 reply; 4+ messages in thread From: annamaya @ 2004-12-14 23:07 UTC (permalink / raw) To: linuxppc-embedded I am not sure if this is the right place to ask this question since this may be a U-Boot question. I am trying to understand how the source for the timer clock is selected on this processor. Figure 4-3 tries to explain this but I am unable to find code in U-Boot that actually sets either BRG1 or one of the GPIO pins to act as inputs for the timer clock generation. Can someone point me to the right place in the code where this is done? I think I know how to do it but I fail to understand where this is being actually done. All I see is the settings of PISCR and TMCNT registers in cpu initialization code. Thanks for your help in advance. __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com ^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: Initialization of Timer Clock on the MPC8260 2004-12-14 23:07 Initialization of Timer Clock on the MPC8260 annamaya @ 2004-12-15 16:28 ` Wolfgang Denk 2004-12-15 17:18 ` annamaya 0 siblings, 1 reply; 4+ messages in thread From: Wolfgang Denk @ 2004-12-15 16:28 UTC (permalink / raw) To: annamaya; +Cc: linuxppc-embedded In message <20041214230712.79751.qmail@web53805.mail.yahoo.com> you wrote: > I am not sure if this is the right place to ask this > question since this may be a U-Boot question. I am Why do you ask here and not on the U-Boot mailing list then? > trying to understand how the source for the timer > clock is selected on this processor. Figure 4-3 tries > to explain this but I am unable to find code in U-Boot > that actually sets either BRG1 or one of the GPIO pins > to act as inputs for the timer clock generation. Can > someone point me to the right place in the code where Well, did you check the place where all GPIO pins get initialized, i. e. board/<name>/<name>.c ? Best regards, Wolfgang Denk -- Software Engineering: Embedded and Realtime Systems, Embedded Linux Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd@denx.de "To take a significant step forward, you must make a series of finite improvements." - Donald J. Atwood, General Motors ^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: Initialization of Timer Clock on the MPC8260 2004-12-15 16:28 ` Wolfgang Denk @ 2004-12-15 17:18 ` annamaya 2004-12-17 15:56 ` annamaya 0 siblings, 1 reply; 4+ messages in thread From: annamaya @ 2004-12-15 17:18 UTC (permalink / raw) To: Wolfgang Denk; +Cc: linuxppc-embedded Hello Wolfgang, I will surely post this in the U-Boot forums. I just did not know where it was but I think I've found it now. I still had the address to the PPCBOOT mailist lists. I miss the good old days. :-) And to answer you questions, yes, I did look at the GPIO pins for all the 8260 boards and not one of them was configured to be a clock. And I was unable to find the setbrg() routine elsewhere to set brgc1 to be the input for timerclk. -Navin. --- Wolfgang Denk <wd@denx.de> wrote: > In message > <20041214230712.79751.qmail@web53805.mail.yahoo.com> > you wrote: > > I am not sure if this is the right place to ask > this > > question since this may be a U-Boot question. I am > > Why do you ask here and not on the U-Boot mailing > list then? > > > trying to understand how the source for the timer > > clock is selected on this processor. Figure 4-3 > tries > > to explain this but I am unable to find code in > U-Boot > > that actually sets either BRG1 or one of the GPIO > pins > > to act as inputs for the timer clock generation. > Can > > someone point me to the right place in the code > where > > Well, did you check the place where all GPIO pins > get initialized, i. e. board/<name>/<name>.c ? > > Best regards, > > Wolfgang Denk > > -- > Software Engineering: Embedded and Realtime > Systems, Embedded Linux > Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 > Email: wd@denx.de > "To take a significant step forward, you must make a > series of finite > improvements." - Donald J. Atwood, General Motors > __________________________________ Do you Yahoo!? The all-new My Yahoo! - Get yours free! http://my.yahoo.com ^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: Initialization of Timer Clock on the MPC8260 2004-12-15 17:18 ` annamaya @ 2004-12-17 15:56 ` annamaya 0 siblings, 0 replies; 4+ messages in thread From: annamaya @ 2004-12-17 15:56 UTC (permalink / raw) To: Wolfgang Denk; +Cc: linuxppc-embedded [-- Warning: decoded text below may be mangled, UTF-8 assumed --] [-- Attachment #1: Type: text/plain; charset=us-ascii, Size: 2779 bytes --] OK Wolfgang. Noone has posted an answer to this question in the U-Boot mailing list. So, I still need help with this. :-) I am looking at the support for one of your own boards, the TQM8260. I dont see PC25, PC27 and PC26 being configured anywhere. And PC29 is configured as an SCC1 CLSN signal. Therefore, I think the internal BRGCLK is used as an input to the timerclk. Now, if this was true, BRGC1 should have been programmed to generate either 4MHz or 32KHz clock. But I dont see this being done anywhere else in the code. I am missing something and I am not sure what that is. Thanks much for your help. --- annamaya <annamaya@yahoo.com> wrote: > Hello Wolfgang, > > I will surely post this in the U-Boot forums. I just > did not know where it was but I think I've found it > now. I still had the address to the PPCBOOT mailist > lists. I miss the good old days. :-) > > And to answer you questions, yes, I did look at the > GPIO pins for all the 8260 boards and not one of > them > was configured to be a clock. And I was unable to > find > the setbrg() routine elsewhere to set brgc1 to be > the > input for timerclk. > > -Navin. > > --- Wolfgang Denk <wd@denx.de> wrote: > > > In message > > > <20041214230712.79751.qmail@web53805.mail.yahoo.com> > > you wrote: > > > I am not sure if this is the right place to ask > > this > > > question since this may be a U-Boot question. I > am > > > > Why do you ask here and not on the U-Boot mailing > > list then? > > > > > trying to understand how the source for the > timer > > > clock is selected on this processor. Figure 4-3 > > tries > > > to explain this but I am unable to find code in > > U-Boot > > > that actually sets either BRG1 or one of the > GPIO > > pins > > > to act as inputs for the timer clock generation. > > Can > > > someone point me to the right place in the code > > where > > > > Well, did you check the place where all GPIO pins > > get initialized, i. e. board/<name>/<name>.c ? > > > > Best regards, > > > > Wolfgang Denk > > > > -- > > Software Engineering: Embedded and Realtime > > Systems, Embedded Linux > > Phone: (+49)-8142-66989-10 Fax: > (+49)-8142-66989-80 > > Email: wd@denx.de > > "To take a significant step forward, you must make > a > > series of finite > > improvements." - Donald J. Atwood, General Motors > > > > > > > __________________________________ > Do you Yahoo!? > The all-new My Yahoo! - Get yours free! > http://my.yahoo.com > > > _______________________________________________ > Linuxppc-embedded mailing list > Linuxppc-embedded@ozlabs.org > https://ozlabs.org/mailman/listinfo/linuxppc-embedded > __________________________________ Do you Yahoo!? All your favorites on one personal page – Try My Yahoo! http://my.yahoo.com ^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2004-12-17 15:56 UTC | newest] Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2004-12-14 23:07 Initialization of Timer Clock on the MPC8260 annamaya 2004-12-15 16:28 ` Wolfgang Denk 2004-12-15 17:18 ` annamaya 2004-12-17 15:56 ` annamaya
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