Section 26.2.1. Planning wording includes the following
"In any case the hardware architecture must be the same — shipping from, say, a 32-bit to a 64-bit system will not work."
would be more correct if it read as follows
"In any case the CPU architecture must be the same — shipping from, say, a 32-bit to a 64-bit system will not work."
as “hardware architecture” would imply the difference between say Dell and IBM which should be ok if the CPU is the same architecture ...
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Regards
Theo Kramer