On 07/14/2014 07:03 AM, Mark Rutland wrote:
Unfortunately I don't have an answer to that; the arm64 Linux spin-table documentation and code were all written before I was involved.
The unfortunate truth is that a lot of the ARM DT and boot unification work was done somewhat blindly, with many subtleties being lost. Someone implemented spin-table with a shared address because it happened to be easier, and then it got copied. Now that people are actively using it it's not possible to remove it, and it's difficult to dissuade others from following the crowd.
If U-Boot provides each CPU with its own unique address, then that would be fantastic, and certainly avoids one nasty edge-case.
In the patch set I sent for review, each CPU has its own spin table. It has an option to use a single release address, or individual release address.
York