Hi all, this seems to be OpenOCD endianess probelem for MIPS big endian targets.
This is what I concluded with further instigation. I started target in little endian mode and let it configure SDRAM. In this case SDRAM is well configured, all values well written and load to SDRAM works correctly. Passing -endian big when creating target, write to the SRDAM controller register is wrong, and thus SDRAM is never well configured. Why is this happening and what seems to be wrong ? BR, Drasko On Wed, Mar 16, 2011 at 11:42 AM, Drasko DRASKOVIC <[email protected]> wrote: > Hi all, > I just tried to load a small test ELF like this : > > 80008000 <_ftext>: > 80008000: 3c088001 lui t0,0x8001 > 80008004: 8d089014 lw t0,-28652(t0) > 80008008: 24090005 li t1,5 > 8000800c: 3c018001 lui at,0x8001 > 80008010: ac299014 sw t1,-28652(at) > > to my Mips-M14Kc core, using mips_m4k as a target (they should be > pretty much the same). What I am seeing in the memory after write is > this : > >> mdw 0x80008000 0x20 > 0x80008000: 00000000 3c083c08 8d088d08 24092409 3c013c01 c833c833 > a430a430 98aa98aa > 0x80008020: d5b5d5b5 c822c822 719f719f d988d988 50305030 c549c549 > dc24dc24 0c280c28 > > So, something that resembles the code, but every half-word is repeated > two times, and later just trash. > However, I am sure that my SDRAM configuration is correct because it > has has been proven by Lauterbach porbe, and I just modified cmm > script. > > Similarly, here is example of the erroneous behavior : > >> mww 0x80000000 0x12345678 >> mdw 0x80000000 > 0x80000000: 00000000 >> mdw 0x80000000 0x3 > 0x80000000: 00000000 3c083c08 8d088d08 >> mww 0x80000004 0x12345678 >> mdw 0x80000000 0x3 > 0x80000000: 00000000 12341234 8d088d08 >> > > > What can be a source to this problem, and where can I start looking > and putting some traces to see what is wrong ? > > I am using Amontec JTAG Key2, core is Mips-M14Kc, Big Endian. OpenOCD > version is the latest git dev branch. > > Best regards, > Drasko > _______________________________________________ Openocd-development mailing list [email protected] https://lists.berlios.de/mailman/listinfo/openocd-development
