Am 09.12.2011 16:03, schrieb Ilya Yanok:
Hi Matthias,
On 09.12.2011 18:24, Matthias Weißer wrote:
breaks zmx25 booting with the following command:
tftpboot 0x82000000 foo.img; dcache on; bootm 0x82000000
It is stuck then in an endless loop after dcache is disabled before jumping to the OS.
WARNING: cache operations are not implemented! WARNING: disabling D-Cache now, you can re-enable itlater with 'dcache on' command
Argh.. That's really bad. May I ask you to debug this a little bit?
What is exact cache function being called? Where from? How comes that dcache_status() returns true after dcache_disable()? Or does somebody call dcache_enable() in between?
The call trace in may case should be something like (not debuged, only looked at the code):
cmd_elf.c : do_bootelf() cmd_elf.c : do_bootelf_exec() cache-cp15.c : dcache_disable() cache-cp15.c : cache_disable(CR_C); -> Cache is not disabled in this function before cache.c : flush_dcache_all(); is called cache.c : dcache_noop(); cache-cp15.c : dcache_status() -> returns true cache-cp15.c : dcache_disable() cache-cp15.c : cache_disable(CR_C) cache.c : flush_dcache_all(); ....
And we have the endless loop. I think this impacts not only zmx25 but other boards enabling dcache.
If you need additional informations: I will have access to the board on monday again.