On Monday, March 12, 2018 at 12:04:23 PM UTC-4, RobertCNelson wrote:
> Bone = am335x targets, no smp
> Ti = utilizes TI sdk kernel.. aka ti engineers get paid to support that 
> kernel.. patches end up mainline..

If I'm ONLY targeting the BeagleBone Blacks and PocketBeagles where we know 
we don't need SMP, is there a reason to go -ti vs. -bone?

The -bone images seems to boot slightly faster.    


> I've been using the --ti --lts-4_14, but recent versions are completely 
> broken for advanced WIFI use cases so I'm kind of trying to figure out what 
> options I have to replace it.    Sometime between 4.14.13-ti-r25 and the 
> current 4.14 version, someone made the boneheaded (pun intended, no offense 
> intended) to include the USB wifi adapters as builtins instead of modules.  
>  This completely breaks any usage of external wifi modules that work 
> "better" (or in some cases, actually work).  We cannot blacklist the 
> builtin modules (even tried the command line params, didn't work).   And 
> even without blacklist, they don't work as the firmwares needed by the wifi 
> adapters are not included in the initial rd.  I'm not sure why they are now 
> built in instead of modules, but it's certainly a huge step backwards IMO.
> That's me, was trying to speed up boot times, we can revert it back to 
> modules.

That would be great if we could.    They really aren't working as modules.  
  With the -bone kernel, I can easily get the Wifi built onto the SanCloud 
BeagleBone Enhanced to work.   I haven't managed to get it to work at all 
with the  latest -ti  4.14 kernels.  wlan0 doesn't even appear due to the 
lack of firmware.

I'm also getting a strange stack trace in dmsg with 4.14.25-ti-r38.  It 
seems to be ignorable, but it's concerning to see:
[   71.453332] WARNING: CPU: 0 PID: 1119 at fs/sysfs/dir.c:31 
[   71.453338] sysfs: cannot create duplicate filename 
[   71.453343] Modules linked in: pruss_soc_bus(+) uio_pruss(+) btusb btrtl 
btbcm btintel bluetooth ecdh_generic 8021q garp mrp stp llc evdev 
uio_pdrv_genirq uio usb_f_acm u_serial usb_f_ecm usb_f_rndis u_ether 
libcomposite iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 
nf_nat nf_conntrack iptable_mangle iptable_filter ip_tables x_tables
[   71.453467] CPU: 0 PID: 1119 Comm: systemd-udevd Not tainted 
4.14.25-ti-r38 #1
[   71.453472] Hardware name: Generic AM33XX (Flattened Device Tree)
[   71.453516] [<c0113a50>] (unwind_backtrace) from [<c010dcec>] 
[   71.453537] [<c010dcec>] (show_stack) from [<c0f3d4d0>] 
[   71.453553] [<c0f3d4d0>] (dump_stack) from [<c013f338>] 
[   71.453564] [<c013f338>] (__warn) from [<c013f3a8>] 
[   71.453576] [<c013f3a8>] (warn_slowpath_fmt) from [<c0385cd0>] 
[   71.453590] [<c0385cd0>] (sysfs_warn_dup) from [<c0385fe0>] 
[   71.453601] [<c0385fe0>] (sysfs_do_create_link_sd) from [<c0386028>] 
[   71.453614] [<c0386028>] (sysfs_create_link) from [<c092db1c>] 
[   71.453637] [<c092db1c>] (bus_add_device) from [<c092b758>] 
[   71.453654] [<c092b758>] (device_add) from [<c0c6b894>] 
[   71.453667] [<c0c6b894>] (of_device_add) from [<c0c6be60>] 
[   71.453678] [<c0c6be60>] (of_platform_device_create_pdata) from 
[<c0c6c02c>] (of_platform_bus_create+0x178/0x310)
[   71.453689] [<c0c6c02c>] (of_platform_bus_create) from [<c0c6c398>] 
[   71.453721] [<c0c6c398>] (of_platform_populate) from [<bf32d2e4>] 
(pruss_soc_bus_probe+0x13c/0x26c [pruss_soc_bus])
[   71.453766] [<bf32d2e4>] (pruss_soc_bus_probe [pruss_soc_bus]) from 
[<c0931374>] (platform_drv_probe+0x60/0xc0)
[   71.453777] [<c0931374>] (platform_drv_probe) from [<c092ee24>] 
[   71.453787] [<c092ee24>] (driver_probe_device) from [<c092f0dc>] 
[   71.453799] [<c092f0dc>] (__driver_attach) from [<c092c90c>] 
[   71.453810] [<c092c90c>] (bus_for_each_dev) from [<c092e5dc>] 
[   71.453819] [<c092e5dc>] (driver_attach) from [<c092df20>] 
[   71.453828] [<c092df20>] (bus_add_driver) from [<c092fe38>] 
[   71.453838] [<c092fe38>] (driver_register) from [<c09312c0>] 
[   71.453854] [<c09312c0>] (__platform_driver_register) from [<bf332020>] 
(pruss_soc_bus_driver_init+0x20/0x1000 [pruss_soc_bus])
[   71.453873] [<bf332020>] (pruss_soc_bus_driver_init [pruss_soc_bus]) 
from [<c0101ca8>] (do_one_initcall+0x64/0x19c)
[   71.453894] [<c0101ca8>] (do_one_initcall) from [<c01e3a88>] 
[   71.453907] [<c01e3a88>] (do_init_module) from [<c01e2a48>] 
[   71.453919] [<c01e2a48>] (load_module) from [<c01e32cc>] 
[   71.453936] [<c01e32cc>] (SyS_init_module) from [<c0108f80>] 

I can stay on 4.14.13-ti-r25 which works fine, but I'm not sure what fixes 
> and such I'd be missing out on going forward.    The --bone  kernels don't 
> seem to have btrfs which, while not critical, is something we've been 
> looking closer at for the COW and compression.   The armv7 kernel seems to 
> work for both btrfs and wifi, but I really don't know what else I'm missing 
> out on with that version.
> Let me know which ones have btrfs disabled, as they should be enabled 
> again.

Hmm.. just tested with 4.15.9-bone4 and it seems to be working there.   I'm 
not sure what version I was using a few weeks ago where it didn't.   Not a 
concern then.  :)

Thanks for the quick follow up!


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