Why are you taking checkpoints with a timing cpu and not an atomic one? It's faster and the caches don't save their state, so if you're using caches with the timing CPU you'll get an incomplete checkpoint.
Ali On Mar 27, 2011, at 11:15 AM, Griffin Wright wrote: > Hello, > > I'm working with checkpoints on simulations with an ARM_SE setup on a simple > timing CPU, and while I can take a checkpoint in simple timing mode just > fine, when I attempt to restore from a checkpoint, I get the following: > > fatal: Can't unserialize 'system.cpu:locked' > @ cycle 1945913882000 > [paramIn:build/ARM_SE/sim/serialize.cc, line 211] > Memory Usage: 559288 KBytes > For more information see: http://www.m5sim.org/fatal/60de9f5a > > That link points to nothing, but that's no biggie. I skimmed through the > user's archive and found some related queries, with the quote at the end of > this message being a solution. I'm wondering if this is in fact the only way > to use the provided restore-checkpoint feature in m5, or if progress has been > made with regards to the simple timing CPU since this below post, or if I'm > looking at my error in the wrong light altogether. > > The code that is failing is as follows, showing that system.cpu:locked cannot > be unserialized: > > if (!cp->find(section, name, str) || !parseParam(str, param)) { > fatal("Can't unserialize '%s:%s'\n", section, name); > } > > "Resume() is the opposite of drain() which means the > system can continue issuing requests and acting as normal. serialize() > needs to save all of the state the CPU needs to put itself in the same > state as it was executing and unserialize() restores that saved state. > Looking at other implementations of save()/restore() is the easiest > way to do this. Finally, if you want to be able to switch to/from the > inorder cpu switchOut() and takeOverFrom() need to be implemented. > > Thank you, > Griffin Wright > > > _______________________________________________ > m5-users mailing list > [email protected] > http://m5sim.org/cgi-bin/mailman/listinfo/m5-users
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