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<TITLE>U-boot port issue on a MPC8280 Custom board</TITLE>
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<P><FONT SIZE=2> Dear all,</FONT>
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<P><FONT SIZE=2> 1) We have a custom designed MPC8280 board. We have brought up the board using BDi2000 ofcourse after a long </FONT>
<BR><FONT SIZE=2> struggle. :-) </FONT>
<BR><FONT SIZE=2> 2) We are trying to bringup the board with u-boot.</FONT>
<BR><FONT SIZE=2> 3) We are using 2 Micron Flash devices MT28F128J3 so total size is 32 MB. Also our system clock is 83.3 Mhz.</FONT>
<BR><FONT SIZE=2> Our flash device has a 125ns/25nsec read access time.</FONT>
<BR><FONT SIZE=2> 4) Our initial boot space as configured in Bdi is 0xfff00100. Our flash base address is 0xfe000000. 12 clock cycle</FONT></P>
<P><FONT SIZE=2> is configured for system clock cycle.</FONT>
<BR><FONT SIZE=2> 5) In u-boot erase and write time-out are configured for 5000 and 5000 respectively.</FONT>
<BR><FONT SIZE=2> 6) While we try to debug the code using gdb, the program stops at 0xfff10108. This address is inside ListInserItem.</FONT></P>
<P><FONT SIZE=2> 7) Before u-boot executes, there was data in 0xfff10108 but after it executes, the flash displays the status of the </FONT></P>
<P><FONT SIZE=2> commands (flash specific commands for writing/erasing). When we write the following command in bdi:</FONT>
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<P><FONT SIZE=2> mm 0xfe000000 0xffffffff</FONT>
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<P><FONT SIZE=2> the flash displays the normal data. That means u-boot data is available from 0xfe000000 but at 0xfff00000 we are </FONT></P>
<P><FONT SIZE=2> seeing all F's but at 0xfff10108 alone we see in the following manner. Something is trying to do a flash erase </FONT></P>
<P><FONT SIZE=2> and that is causing the problem.</FONT>
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<P><FONT SIZE=2> 0xfff10108 0000ffff</FONT>
<BR><FONT SIZE=2> 8) From Bdi2000, the stepping happens fine. Atleast it not going till board_init_f, cpu_init_f yes. </FONT>
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<P><FONT SIZE=2> My problem is doing debugging from GDB :</FONT>
<BR><FONT SIZE=2> Why is data at 0xfff00000 gets erased ? And also why is the command given incomplete ?</FONT>
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<P><FONT SIZE=2> Hope somebody will help me solve the issue. I can send the map file if somebody needs it. I don't have any </FONT>
<BR><FONT SIZE=2> special logging or console buffer enabled. Even ethernet code is disabled. Only serial is enabled on SMC1.</FONT>
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<P><FONT SIZE=2>With Thanks and Regards,</FONT>
<BR><FONT SIZE=2>C.R.Srivatsan</FONT>
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