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How to confine code addresses

EJ Wu

Hi all,
I'm currently working on a project which requires that part of the code is located below address 0x1000 and freezed, while other must be above 0x1000 and can be modified. Mixing up is not allowed. I used BL51 options below: 

"BL51 X.obj code(?pr?*?upper_1k(1000h))"
. Most of the time it works but sometimes it just doesn't, especially when using lots of XBYTE[]. Codes just escape into the lower 1kByte memory and mess up everything.
Are there other options that I can use? I've been struggling on this for several days.

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