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| 01:09.34 | detule | hey jonpry |
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| 02:09.43 | jonpry | hi detule |
| 02:10.16 | detule | jonpry, this is what you guys are using https://gitorious.org/droid3-kexec/droid3-kexec-kernel/blobs/3.0.8-dev/arch/arm/mm/proc-v7.S#line63 |
| 02:10.51 | jonpry | mmm |
| 02:11.07 | jonpry | well depends |
| 02:11.41 | jonpry | that is not used in the kexec module loaded into the .35 host kernel |
| 02:12.08 | jonpry | in fact we don't use any cpu_reset in kexec. it kept busting for some reason |
| 02:12.30 | detule | not turning the mmu off at all |
| 02:12.44 | jonpry | we turn mmu off |
| 02:12.47 | jonpry | for sure |
| 02:12.51 | detule | where |
| 02:13.00 | jonpry | its built into relocate-kernel.S |
| 02:13.13 | jonpry | in the actual relocate-kernel entry point |
| 02:13.25 | detule | i thought to turn the mmu off one needs to flib a bit on the control register |
| 02:13.31 | jonpry | yeah it does |
| 02:13.32 | detule | don't see that in relocate kernel |
| 02:14.29 | jonpry | https://gitorious.org/droid3-kexec/droid3-kexec-modules/blobs/master/arch/arm/kernel/relocate_kernel.S#line97 |
| 02:14.38 | jonpry | 0x7 is all bs off |
| 02:14.49 | detule | oh yeah |
| 02:14.50 | detule | that's what i need |
| 02:15.01 | detule | i think this turning the mmu off in setup_mm_for_reboot is bad mojor |
| 02:15.10 | detule | s/mojor/mojo/ |
| 02:15.15 | jonpry | it doesn't does it? |
| 02:15.16 | detule | way too earl |
| 02:15.18 | detule | y |
| 02:15.28 | jonpry | it just prepares vm for mmu off |
| 02:15.44 | detule | i keep thinking it wipes out the instruction stream coz this pos keeps stalling |
| 02:16.11 | jonpry | ouch |
| 02:16.31 | jonpry | i thought it was working except cpu1? |
| 02:16.41 | detule | well god damnit i can't replicate my earlier success |
| 02:17.12 | detule | either my tree is polluted somehow or it was just dumb luck that it worked when i pulled that last_kmsg |
| 02:17.16 | jonpry | adb only works for me in one branch |
| 02:17.20 | jonpry | and i can't find the diff |
| 02:18.24 | jonpry | i really don't think setup_mm-for_reboot it turning mmu off |
| 02:18.37 | jonpry | you should probably reanalyze that |
| 02:20.13 | detule | oh yeah i said something definitely not true |
| 02:20.41 | detule | it just takes out an identity map |
| 02:21.24 | detule | still that mmu_off in cpu reset is earlier than putting it in relocate_kernel |
| 02:22.18 | detule | not by much |
| 02:25.15 | jonpry | the trouble is that the place relocate_kernel gets copied to. might be above the identity map |
| 02:25.27 | jonpry | that isn't the case on my lowly 512mb phone |
| 02:25.53 | detule | ok but don't we pass the physical location of where it gets copied to |
| 02:26.16 | jonpry | it still must be in the identity map |
| 02:26.27 | detule | oh |
| 02:26.39 | detule | that would be my problem |
| 02:26.56 | jonpry | only a function running inside of an identity map can achieve mmu off |
| 02:28.30 | detule | i have cpu_reset in the mapping but not relocate_kernel |
| 02:29.21 | detule | if i leave cpu_reset turn the mmu off is this still an issue? |
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| 02:36.44 | jonpry | detule, no i don't think so |
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| 09:33.59 | zeusk | hi |
| 09:34.34 | zeusk | jonpry, why're you invalidating instruction tlb and data tlb after invalidating UTLB ? |
| 09:39.27 | jonpry | that's how the kernel does it |
| 09:40.07 | jonpry | i can't speak to the wisdom |
| 09:40.26 | jonpry | also i think armv7 doesn't actually have UTLB |
| 09:41.31 | zeusk | ARM docs mention ULTB, infact i can see UTLB operation in HTC SPL |
| 09:41.47 | zeusk | (for Cortex-A8, armv7-scorpion) |
| 09:42.17 | zeusk | what problem are you having ? |
| 09:43.28 | zeusk | you should be disabling caches along/before MMU |
| 09:43.45 | zeusk | s/MMU/disabling MMU/ |
| 09:45.59 | zeusk | invalidate L2, disable fpu if on, DSB, Invalidate icache and dcache, disable dcache, icache and mmu, invalidate tlb |
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| 09:46.29 | Alex[sp3dev] | finally stupid jtag works on a stupid pandaboard in my stupid hands |
| 09:46.31 | jonpry | no problem is happening |
| 09:46.37 | jonpry | it all works pretty good |
| 09:46.51 | jonpry | good enough to be kanged |
| 09:47.26 | zeusk | alex, woot, how does it feel to halt the core at own wish ? :D |
| 09:47.50 | Alex[sp3dev] | the problems were (1) my hands which connected arm 14-pin header to the 20-pin one in the wrong way and (2) a j-link clone that failed to work. olimex usb tiny works fine |
| 09:47.55 | Alex[sp3dev] | zeusk: feels so 1337 |
| 09:48.03 | Alex[sp3dev] | (gdb) x 0x4a002204 |
| 09:48.03 | Alex[sp3dev] | 0x4a002204:0x6b95c02f |
| 09:48.24 | jonpry | invalidating TLB is probably not critical since it isn't used until mmu is reenabled |
| 09:48.49 | Alex[sp3dev] | now I need to figure out how to debug linux under jtag |
| 09:49.39 | zeusk | the only board i have with such capability is a STM cortex-m0 with 8kb ram and no mmu, can i run android on it ? |
| 09:50.36 | zeusk | jonpry, that's how most software do it, invalidate TLB after turning MMU off but you could be right.. |
| 09:53.18 | jonpry | that's how i do it too |
| 09:53.33 | jonpry | just get everything squeaky clean |
| 10:39.52 | zeusk | scorpion's cache line is 64kb or 128kb ? |
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