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.
