IRC log for #maemo on 20151223

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09:43.03freemangordonPali: BTW, what was the final decision re ATAGS?
09:43.22freemangordonI've lost the end of the conversation
09:43.55Palifreemangordon: 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
09:44.40freemangordonso it can be dumped to a file on a later stage?
09:44.48Paliand 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
09:45.29Palieverything just from rx51 code without touching global arm/boot code
09:45.36freemangordongreat
09:45.37Palibut I did not tried to play with it yet
09:45.54Palithis solution will be accepted (once somebody write and test it)
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09:47.00freemangordonh,, I'll see if I feel relaxed in the incomming holidays, may look at it
09:47.54zGrrmoin :)
09:48.04freemangordon:)
10:04.43freemangordonPali: does latest n900 kernel on github compiles?
10:04.55freemangordonand does it have DT enabled?
10:05.11Palifreemangordon: do not know, I have not updated it for a long time
10:05.16Palibut I think it should
10:05.21freemangordonok
10:05.43freemangordonPali: which one to use, 4.2?
10:05.55Paliprobably last version
10:06.01freemangordonok
10:06.19freemangordonhmm, seems my CPU heatsink needs to get cleaned :)
10:07.33freemangordonCPU hit 78 deg while compiling the zImage, before being stopped with ctrl-c :)
10:16.02zGrrare there any news related to neo900?
10:16.19zGrri mean, some progress?
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10:54.05freemangordonPali: any ide where to put rx51_reserve()? in board-generic.c? in common.c? in pdata-quirks.c?
10:54.14freemangordon*idea
10:54.54Palifreemangordon, search for nokia_n900_legacy_init
10:55.07freemangordonit is in pdata
10:55.15freemangordonpdata-quirks.c
10:55.16Paliand for n900_boards_compat
10:55.32freemangordonit is boards-generic :)
10:55.43freemangordon*board-generic
10:55.50PaliI think reserve memory needs to be instead omap_reserve in "DT_MACHINE_START(OMAP3_N900_DT, "Nokia RX-51 board")"
10:55.56freemangordonsure
10:56.13freemangordonthe point is that - where to put that replacement function
10:56.20freemangordonin which file
10:57.25freemangordonI think the best place is board-generic.c, so it can be defined as static, but I see no function definitions in that fil
10:57.30Paliin my opinion put new function into pdata-quirks.c
10:57.53freemangordonand declare it where? in common.h?
10:57.59Paliand assign it to .reserve =
10:58.39Paliheader file common.h
10:58.52freemangordonI know where to assign it, but it needs to be extern, not static if defined anywhere outside if board-generic
10:59.00freemangordon*of
10:59.13Paliyes, it must be non-static
10:59.30Pali"extern" keyword for C function is not needed and is not used
10:59.52freemangordonbut if it is declared in common.h, whine not define it in common.c then?
10:59.58freemangordon*while
11:00.05freemangordonshit
11:00.06Palibecause it is quirkk function
11:00.07freemangordonWHY
11:00.20freemangordonso is omap_reserve()
11:00.44freemangordonwill ask on linux-omap
11:00.53Palibasically this is n900 specific function and correct place is in pdata-quirks.c
11:01.34Palibut you must assign pointer to that function in file board-generic.c and that file includes only common.h
11:04.14freemangordonPali: 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.
11:04.52freemangordonor put it in common.c - if it is declared in common.h
11:06.22Palithat board-generic.c does not contains board specific functions
11:06.32Palibut put it here...
11:06.40freemangordonoh, wait, the *is* at least one function defined in board-generic -   omap_generic_init()
11:06.58freemangordonbut it contains board specific data, so I'll put it there
11:07.03Paliomap maintainers will accept it or not
11:07.46freemangordon:nod:
11:08.45freemangordonPali: do we have atags address and size?
11:09.54Paliwe have offset
11:10.01freemangordon0ь100?
11:10.07freemangordon0x100?
11:10.09Paliand size shold be smaller then one page
11:10.12freemangordonok
11:10.37Palimemblock_reserve(PHYS_OFFSET, PAGE_SIZE);
11:10.46freemangordonyeah
11:13.09Paliread this thread: http://www.spinics.net/lists/arm-kernel/msg464340.html
11:13.22Pali(all messages in "Next by thread" links)
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11:27.03freemangordonPali: already did it, I am in CC on linux-omap ML :)
11:27.11Paliok :-)
11:28.19freemangordonbut this memblock API is not very understandable, WTF is the difference between memblock_free and memblock_remove?!?
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14:03.04freemangordonPali: what about copying atags data to some __init structure instead of doing memblock_reserve()?
14:03.57freemangordonas it turns out, memblock_reserved() memory cannot be given back to the system once  paging_init() is called
14:04.43Palifreemangordon, you can call directly function save_atags()
14:06.26freemangordonPali: hmm, tell me then why this is not done yet? I men - I've lost the roots of the problem.
14:06.29freemangordon*mean
14:07.00Paliproblem is that I'm not sure if you really can read that memory where are atags stored
14:07.06Paliif they are not rewritten yet...
14:07.34freemangordonstatic char __initdata atags_copy[BOOT_PARAMS_SIZE];
14:07.41Paliyou need to read them before some memory/page init functions are called
14:08.37freemangordonPali: save_atags is called from setup_machine_tags
14:08.58Paliyes, but that pointer points to DTS blob!
14:09.02Palinot to atags memory
14:10.24freemangordonoh, I see
14:14.53freemangordonPali: but then, what needs to be done? I mean - DT anyways creates /pros/atags, correct? We can;t overwrite it.
14:15.16PaliDT does not create /proc/atags
14:15.25Pali*DT booted kernel
14:15.58Paliand we want to read ATAGs passed by nolo to kernel also for rx51 device booted in DT mode
14:16.23freemangordonbut what does  init_atags_procfs then?
14:16.53Palion DT booted kernel nothing
14:17.13Palibut if you are using my tree, it contains special patch which store ATAGs into DT structure
14:17.27Paliand then kernel unpack ATAGs from DT structure and store them into /proc/atags
14:17.34Palibut this patch was rejected
14:17.37freemangordonbecause  atags_copy contains nothing?
14:17.46Palisomething like that
14:17.57Palido not rememeber exacly
14:18.04Palisave_atags is not called in DT booted kernel
14:20.10freemangordonit 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
14:21.21freemangordonI know it is not called with the atags from the bootloader
14:21.26freemangordonbut still it is called
14:46.11freemangordonPali: what do you think about http://pastebin.com/MHzUvusK ?
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14:56.41Palifreemangordon, no need to #ifdef CONFIG_ATAGS_PROC
14:56.56Palijust include atags.h or kernel/atags.h
14:56.57freemangordonwhy?
14:57.01freemangordonyou can;t
14:57.16Palisave_atags() is noop when CONFIG_ATAGS_PROC is not defined
14:57.18freemangordonwhat needs to be included is ../kernel/atags.h
14:57.27freemangordonwhich is ugly
14:57.54freemangordonI know it is noop, but still I define one more static function, which is not needed
14:58.02Paliif you use function from kernel you should include header file
14:58.33freemangordonI don;t believe #include "../kernel/atags.h" will be upstreamed :)
14:59.30Paliwithout correct header too...
14:59.34Palibetter ask on ML
14:59.46freemangordonlets see what will say Russell, I'll fix those nits later
14:59.48Palibut first check if it is working
15:00.18Paliok
15:00.24freemangordonand this is the problem, I don;t have device with booting upstream kernel :)
15:00.41freemangordoncan I boot qemu to userspace?
15:01.06freemangordonPali: ^^^
15:01.19Paliyes
15:01.29Palismall userspace with busybox is enough
15:01.40freemangordondo you have something prepared?
15:01.58PaliI have script which build userspace :-)
15:02.07Paliand start qemu
15:02.10freemangordongood for you :)
15:02.17freemangordoncare to share it?
15:02.45Paliok, I'm going to clean it and send it to you
15:02.55Palinow it depends on my PC :-)
15:02.55freemangordonthanks
15:03.06freemangordonsend it as well :)
15:04.10freemangordonPali: don;t hurry, my GF has birthday today, so I don;t think I will have much more time to spend on that today
15:14.55DocScrutinizer05hi folks
15:17.31Palifreemangordon: done, see email
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