I now see our disconnect Noel. Yes the V6 kernel runs in split I and D mode, but it doesn’t end up supporting any more data. I.e. the kernel is still a 407 (or 410) file. _etext/_edata/_end are still referencing the same 64K space. What we did (among others) was to allow the system to boot up from a split I/D image that could be a full 65K of text and a substantial additional amount of initialized data (and bss). -------------- next part -------------- A non-text attachment was scrubbed... Name: smime.p7s Type: application/pkcs7-signature Size: 2284 bytes Desc: not available URL: