I have a Wandboard rev C1 with linux-armv7-3.19.1. On dmesg output I can see next warning:
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WARNING: CPU: 1 PID: 144 at net/wireless/reg.c:521 regulatory_init+0x7c/0x114 [cfg80211]()
db.txt is empty, you should update it...
Modules linked in:
cfg80211(+) imx_ipuv3_crtc snd_soc_fsl_ssi imx_pcm_fiq snd_soc_sgtl5000 snd_soc_imx_spdif snd_soc_imx_sgtl5000 snd_soc_fsl_spdif rfkill imx_pcm_dma snd_soc_core snd_compress snd_pcm_dmaengine snd_pcm snd_soc_imx_audmux snd_timer ac97_bus etnaviv(C) pwm_imx imx_hdmi imxdrm imx_ipu_v3 drm_kms_helper uio_pdrv_genirq uio sch_fq_codel tcp_lp nf_conntrack_sane nf_conntrack
CPU: 1 PID: 144 Comm: systemd-udevd Tainted: G C 3.19.1-3-ARCH #1
Hardware name: Freescale i.MX6 Quad/DualLite (Device Tree)
[<c001822c>] (unwind_backtrace) from [<c0012588>] (show_stack+0x20/0x24)
[<c0012588>] (show_stack) from [<c0902164>] (dump_stack+0x7c/0x98)
[<c0902164>] (dump_stack) from [<c00518fc>] (warn_slowpath_common+0x9c/0xc8)
[<c00518fc>] (warn_slowpath_common) from [<c0051968>] (warn_slowpath_fmt+0x40/0x48)
[<c0051968>] (warn_slowpath_fmt) from [<bf42d15c>] (regulatory_init+0x7c/0x114 [cfg80211])
[<bf42d15c>] (regulatory_init [cfg80211]) from [<bf42d060>] (cfg80211_init+0x60/0xe0 [cfg80211])
[<bf42d060>] (cfg80211_init [cfg80211]) from [<c0008cf0>] (do_one_initcall+0x110/0x1c0)
[<c0008cf0>] (do_one_initcall) from [<c00c8884>] (load_module+0x17e8/0x1d94)
[<c00c8884>] (load_module) from [<c00c8f14>] (SyS_init_module+0xe4/0xec)
[<c00c8f14>] (SyS_init_module) from [<c000e620>] (ret_fast_syscall+0x0/0x34)
---[ end trace 5db50bc5601472a9 ]---
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I have tried solve it installing "crda" but warning persist.
Can I ignore it?