Hi , Thanx. Okay Strong ARM cannot do it. But my general doubt is that is it possible to access core registers of any processor via JTAG ?. I am talking in reference how using the freeze pin of the MPC 823E or the Power PC series we can get the values of the internal registers etc. Is it a JTAG interface like thing?
Harishankkar On Friday 01 March 2002 21:16, Hicks, Jamey wrote: > The SA1110 uses a core implemented by Digital Equipment Corp (and now owned > by Intel). It does not provide a way to access any of the internal > registers, including the system control registers, nor does it provide the > debugging interface provided by the ARM processor cores from ARM. It only > provides the standard Boundary Scan interface. > > Jamey > > > -----Original Message----- > > From: Harishankkar [mailto:[EMAIL PROTECTED]] > > Sent: Friday, March 01, 2002 10:37 AM > > To: Ganesh S > > Cc: [EMAIL PROTECTED]; [EMAIL PROTECTED] > > Subject: Re: Some Questions on JTAG > > > > > > Hi ganesh, > > Thanx for the reply. SA1110 uses ARMv4 core. > > You mean to say that you can access the system control registers etc > > via this special instruction in SA1110?But they cannot access > > the processor > > registers rite?This is because the SA1100 core sits over the > > ARMV4 core and > > the JTAG which is part of the SA1100 and so must be able to > > access only the > > SA1100 stuff. > > But one doubt even if you are able to send some special > > instruction to access > > the processor registers how do you send the address? For eg > > if you want to > > access GPCR .How do you send the address? > > Like I would like to know the sequence like Instruction is > > given in ShiftIR > > mode where will be the address given. If the address is > > external to the chip > > then they can be given via boundary scan logic but if it is > > internal then how > > is it possible? > > If this can be done then why there has not been any kind of > > JTAG debuggers > > from Intel? > > > > Thanx in adv, > > Harishankkar > > > > On Friday 01 March 2002 09:16, you wrote: > > > Hi Harishankar > > > > > > Ofcourse, you can read the processor register and do many > > > > more stuff via > > > > > JTAG. That is provided you know the private JTAG instruction of the > > > processor on Assabet (ARM ?). This private instruction set > > > > is usually not > > > > > disclosed by the processor vendor in their Boundary scan description > > > language (BSDL) file. > > > > > > Thanks > > > Ganesh > > > > > > -----Original Message----- > > > From: [EMAIL PROTECTED] > > > [mailto:[EMAIL PROTECTED]]On Behalf Of > > > > Harishankkar > > > > > Sent: Friday, March 01, 2002 5:46 AM > > > To: [EMAIL PROTECTED] > > > Subject: Some Questions on JTAG > > > > > > > > > Hi all, > > > After reading the JTAG code for Assabet I understand that once > > > the boundary scan interface is entered via extest function > > > > the whole board > > > > > as > > > a whole becomes a slave of the JTAG controller. That is the > > > > core loses its > > > > > functionality and becomes dummy and the JTAG controller has > > > > the entire > > > > > rights > > > for all the pins. Now I would like to know that whether it > > > > is possible to > > > > > control the core operations via JTAG? That is is it > > > > possible to read any > > > > > processor registers? > > > > > > Thanx in adv, > > > Harishankkar > > > > > > > > > > > > _______________________________________________ > > > http://lists.arm.linux.org.uk/mailman/listinfo/linux-arm > > > http://www.arm.linux.org.uk/armlinux/mailinglists.php > > > Please visit the above addresses for information on this list. > > > > ---------------------------------------- > > Content-Type: text/plain; charset="iso-8859-1"; > > name="Wipro_Disclaimer.txt" > > Content-Transfer-Encoding: 7bit > > Content-Description: > > ---------------------------------------- > > > > > > _______________________________________________ > > http://lists.arm.linux.org.uk/mailman/listinfo/linux-arm > > http://www.arm.linux.org.uk/armlinux/mailinglists.php > > Please visit the above addresses for information on this list. _______________________________________________ http://lists.arm.linux.org.uk/mailman/listinfo/linux-arm http://www.arm.linux.org.uk/armlinux/mailinglists.php Please visit the above addresses for information on this list.
