On 14:20 Tue 31 Mar , Drasko DRASKOVIC wrote: > >On Mon, Mar 30, 2009 at 10:31 PM, Jean-Christophe PLAGNIOL-VILLARD wrote: > >before booting linux you must disable the cache which will be re-enable > by > >linux. > OK. Is that done in bootm.c? I can see lines : > /* > * We have reached the point of no return: we are going to > * overwrite all exception vector code, so we cannot easily > * recover from any failures any more... > */ > > iflag = disable_interrupts(); > > #ifdef CONFIG_AMIGAONEG3SE > /* > * We've possible left the caches enabled during > * bios emulation, so turn them off again > */ > icache_disable(); > invalidate_l1_instruction_ > cache(); > flush_data_cache(); > dcache_disable(); > #endif AMIGAONE is a PPC
please take a look on this file lib_arm/bootm.c and specialy on the cleanup_before_linux (); soc implementation > >Could you give us more details about your soc, u-boot verison and linux > >version > u-boot-1.1.6, linux version is linux-2.6.25.10, although that is not > important because I have no problem with this but with slow access to > Flash and SDRAM, as I said before. Core is ARM926. U-Boot 1.1.6 is quite old (more than 2 years old) please try to the current version is your SOC in the Mainline? if you can tell us which one it's and if it is mainline in U-Boot or Linux? we could take a look on the code > > As I understand, these things have to be set up in the order to enable > DCache : > 1. Page tables > 2. The Translation Lookaside Buffer (TLB) > 3. Domains and access permission > 4. Caches and write buffer > 5. The CP15:c1 control register > 6. The Fast Context Switch Extension > Now, that seems like a lot of work to be done, and reading manual is not > extremely helpful, so I was wondering if somebody already done similar > thing in U-Boot, for ARM9 platform, so I could reuse some work or examine > examples to figure out how this is done. in linux yes in u-boot some arch do it but not the arm9 IMHO your boot problem is more in linux than in U-Boot but until we can take a look on the code it will be hard to known Best Regards, J. _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
