Quote:
Originally Posted by geekmaster
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EDIT: Because the upgrade to 256MB uses a power of 2 for the row and column address in the RAM chip(s), you probably do NOT need to add any additional address line in this case. You may also need to modify the u-boot bootloader (and perhaps other code) to initialize and use the extra RAM.
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Let me clarify that. What I meant to say is that because 256MB is a square layout (same number of rows and columns), you should not need to route an additional address line.
However, if you were upgrading from 64MB to 256MB, you may well need to add such an additional address line (to be used for the extra row and extra column address bit). Such memory quadrupling is not all that uncommon for severely memory-limit devices such as wireless routers. But for a kindle, no worries!
