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| freemangordon | Pali: BTW, what was the final decision re ATAGS? | 11:43 |
| freemangordon | I've lost the end of the conversation | 11:43 |
| Pali | freemangordon: looks like via reserve memory hook from arch/arm/mach-omap2 we should be able to prevent linux kernel to overwrite memory where are original ATAGs stored | 11:43 |
| freemangordon | so it can be dumped to a file on a later stage? | 11:44 |
| Pali | and then from rx51 specific board hook (already have one for emmc and one for thumb2 errata) we should be able to read them and store back to /proc/atags | 11:44 |
| Pali | everything just from rx51 code without touching global arm/boot code | 11:45 |
| freemangordon | great | 11:45 |
| Pali | but I did not tried to play with it yet | 11:45 |
| Pali | this solution will be accepted (once somebody write and test it) | 11:45 |
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| freemangordon | h,, I'll see if I feel relaxed in the incomming holidays, may look at it | 11:47 |
| zGrr | moin :) | 11:47 |
| freemangordon | :) | 11:48 |
| freemangordon | Pali: does latest n900 kernel on github compiles? | 12:04 |
| freemangordon | and does it have DT enabled? | 12:04 |
| Pali | freemangordon: do not know, I have not updated it for a long time | 12:05 |
| Pali | but I think it should | 12:05 |
| freemangordon | ok | 12:05 |
| freemangordon | Pali: which one to use, 4.2? | 12:05 |
| Pali | probably last version | 12:05 |
| freemangordon | ok | 12:06 |
| freemangordon | hmm, seems my CPU heatsink needs to get cleaned :) | 12:06 |
| freemangordon | CPU hit 78 deg while compiling the zImage, before being stopped with ctrl-c :) | 12:07 |
| zGrr | are there any news related to neo900? | 12:16 |
| zGrr | i mean, some progress? | 12:16 |
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| freemangordon | Pali: any ide where to put rx51_reserve()? in board-generic.c? in common.c? in pdata-quirks.c? | 12:54 |
| freemangordon | *idea | 12:54 |
| Pali | freemangordon, search for nokia_n900_legacy_init | 12:54 |
| freemangordon | it is in pdata | 12:55 |
| freemangordon | pdata-quirks.c | 12:55 |
| Pali | and for n900_boards_compat | 12:55 |
| freemangordon | it is boards-generic :) | 12:55 |
| freemangordon | *board-generic | 12:55 |
| Pali | I think reserve memory needs to be instead omap_reserve in "DT_MACHINE_START(OMAP3_N900_DT, "Nokia RX-51 board")" | 12:55 |
| freemangordon | sure | 12:55 |
| freemangordon | the point is that - where to put that replacement function | 12:56 |
| freemangordon | in which file | 12:56 |
| freemangordon | I think the best place is board-generic.c, so it can be defined as static, but I see no function definitions in that fil | 12:57 |
| Pali | in my opinion put new function into pdata-quirks.c | 12:57 |
| freemangordon | and declare it where? in common.h? | 12:57 |
| Pali | and assign it to .reserve = | 12:57 |
| Pali | header file common.h | 12:58 |
| freemangordon | I know where to assign it, but it needs to be extern, not static if defined anywhere outside if board-generic | 12:58 |
| freemangordon | *of | 12:59 |
| Pali | yes, it must be non-static | 12:59 |
| Pali | "extern" keyword for C function is not needed and is not used | 12:59 |
| freemangordon | but if it is declared in common.h, whine not define it in common.c then? | 12:59 |
| freemangordon | *while | 12:59 |
| freemangordon | shit | 13:00 |
| Pali | because it is quirkk function | 13:00 |
| freemangordon | WHY | 13:00 |
| freemangordon | so is omap_reserve() | 13:00 |
| freemangordon | will ask on linux-omap | 13:00 |
| Pali | basically this is n900 specific function and correct place is in pdata-quirks.c | 13:00 |
| Pali | but you must assign pointer to that function in file board-generic.c and that file includes only common.h | 13:01 |
| freemangordon | Pali: but there *is* device specific data in board-generic.c - struct n900_boards_compat, why not define that function there as well. And make it static. | 13:04 |
| freemangordon | or put it in common.c - if it is declared in common.h | 13:04 |
| Pali | that board-generic.c does not contains board specific functions | 13:06 |
| Pali | but put it here... | 13:06 |
| freemangordon | oh, wait, the *is* at least one function defined in board-generic - omap_generic_init() | 13:06 |
| freemangordon | but it contains board specific data, so I'll put it there | 13:06 |
| Pali | omap maintainers will accept it or not | 13:07 |
| freemangordon | :nod: | 13:07 |
| freemangordon | Pali: do we have atags address and size? | 13:08 |
| Pali | we have offset | 13:09 |
| freemangordon | 0ь100? | 13:10 |
| freemangordon | 0x100? | 13:10 |
| Pali | and size shold be smaller then one page | 13:10 |
| freemangordon | ok | 13:10 |
| Pali | memblock_reserve(PHYS_OFFSET, PAGE_SIZE); | 13:10 |
| freemangordon | yeah | 13:10 |
| Pali | read this thread: http://www.spinics.net/lists/arm-kernel/msg464340.html | 13:13 |
| Pali | (all messages in "Next by thread" links) | 13:13 |
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| freemangordon | Pali: already did it, I am in CC on linux-omap ML :) | 13:27 |
| Pali | ok :-) | 13:27 |
| freemangordon | but this memblock API is not very understandable, WTF is the difference between memblock_free and memblock_remove?!? | 13:28 |
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| freemangordon | Pali: what about copying atags data to some __init structure instead of doing memblock_reserve()? | 16:03 |
| freemangordon | as it turns out, memblock_reserved() memory cannot be given back to the system once paging_init() is called | 16:03 |
| Pali | freemangordon, you can call directly function save_atags() | 16:04 |
| freemangordon | Pali: hmm, tell me then why this is not done yet? I men - I've lost the roots of the problem. | 16:06 |
| freemangordon | *mean | 16:06 |
| Pali | problem is that I'm not sure if you really can read that memory where are atags stored | 16:07 |
| Pali | if they are not rewritten yet... | 16:07 |
| freemangordon | static char __initdata atags_copy[BOOT_PARAMS_SIZE]; | 16:07 |
| Pali | you need to read them before some memory/page init functions are called | 16:07 |
| freemangordon | Pali: save_atags is called from setup_machine_tags | 16:08 |
| Pali | yes, but that pointer points to DTS blob! | 16:08 |
| Pali | not to atags memory | 16:09 |
| freemangordon | oh, I see | 16:10 |
| freemangordon | Pali: but then, what needs to be done? I mean - DT anyways creates /pros/atags, correct? We can;t overwrite it. | 16:14 |
| Pali | DT does not create /proc/atags | 16:15 |
| Pali | *DT booted kernel | 16:15 |
| Pali | and we want to read ATAGs passed by nolo to kernel also for rx51 device booted in DT mode | 16:15 |
| freemangordon | but what does init_atags_procfs then? | 16:16 |
| Pali | on DT booted kernel nothing | 16:16 |
| Pali | but if you are using my tree, it contains special patch which store ATAGs into DT structure | 16:17 |
| Pali | and then kernel unpack ATAGs from DT structure and store them into /proc/atags | 16:17 |
| Pali | but this patch was rejected | 16:17 |
| freemangordon | because atags_copy contains nothing? | 16:17 |
| Pali | something like that | 16:17 |
| Pali | do not rememeber exacly | 16:17 |
| Pali | save_atags is not called in DT booted kernel | 16:18 |
| freemangordon | it should be, at least from what I see in the code http://lxr.free-electrons.com/source/arch/arm/kernel/atags_parse.c#L227 . unless that if fails | 16:20 |
| freemangordon | I know it is not called with the atags from the bootloader | 16:21 |
| freemangordon | but still it is called | 16:21 |
| freemangordon | Pali: what do you think about http://pastebin.com/MHzUvusK ? | 16:46 |
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| Pali | freemangordon, no need to #ifdef CONFIG_ATAGS_PROC | 16:56 |
| Pali | just include atags.h or kernel/atags.h | 16:56 |
| freemangordon | why? | 16:56 |
| freemangordon | you can;t | 16:57 |
| Pali | save_atags() is noop when CONFIG_ATAGS_PROC is not defined | 16:57 |
| freemangordon | what needs to be included is ../kernel/atags.h | 16:57 |
| freemangordon | which is ugly | 16:57 |
| freemangordon | I know it is noop, but still I define one more static function, which is not needed | 16:57 |
| Pali | if you use function from kernel you should include header file | 16:58 |
| freemangordon | I don;t believe #include "../kernel/atags.h" will be upstreamed :) | 16:58 |
| Pali | without correct header too... | 16:59 |
| Pali | better ask on ML | 16:59 |
| freemangordon | lets see what will say Russell, I'll fix those nits later | 16:59 |
| Pali | but first check if it is working | 16:59 |
| Pali | ok | 17:00 |
| freemangordon | and this is the problem, I don;t have device with booting upstream kernel :) | 17:00 |
| freemangordon | can I boot qemu to userspace? | 17:00 |
| freemangordon | Pali: ^^^ | 17:01 |
| Pali | yes | 17:01 |
| Pali | small userspace with busybox is enough | 17:01 |
| freemangordon | do you have something prepared? | 17:01 |
| Pali | I have script which build userspace :-) | 17:01 |
| Pali | and start qemu | 17:02 |
| freemangordon | good for you :) | 17:02 |
| freemangordon | care to share it? | 17:02 |
| Pali | ok, I'm going to clean it and send it to you | 17:02 |
| Pali | now it depends on my PC :-) | 17:02 |
| freemangordon | thanks | 17:02 |
| freemangordon | send it as well :) | 17:03 |
| freemangordon | Pali: don;t hurry, my GF has birthday today, so I don;t think I will have much more time to spend on that today | 17:04 |
| DocScrutinizer05 | hi folks | 17:14 |
| Pali | freemangordon: done, see email | 17:17 |
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