[Bug 222256] RPI random number generator underruns when BCM2835_RNG_USE_CALLOUT is set

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=222256

            Bug ID: 222256
           Summary: RPI random number generator underruns when
                    BCM2835_RNG_USE_CALLOUT is set
           Product: Base System
           Version: CURRENT
          Hardware: arm
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: sylvain at sylvaingarrigues.com

When used on a Raspberry Pi 3 with BCM2835_RNG_USE_CALLOUT defined, the boot
lok includes a lot of:

bcmrng0: Too many underruns, resetting
bcmrng0: RNG stalled, disabling device

--

Relevant part of boot log:

bcmrng0: <Broadcom BCM2835 RNG> mem 0x7e104000-0x7e10400f on simplebus0
bcmrng0: RNG_CTRL (00000001)
  RNG_COMBLK2_OSC (00)
    Oscillator 1 enabled
    Oscillator 2 enabled
    Oscillator 3 enabled
    Oscillator 4 enabled
    Oscillator 5 enabled
    Oscillator 6 enabled
  RNG_COMBLK1_OSC (00)
    Oscillator 1 enabled
    Oscillator 2 enabled
    Oscillator 3 enabled
    Oscillator 4 enabled
    Oscillator 5 enabled
    Oscillator 6 enabled
  RNG_JCLK_BYP_DIV_CNT (00)
    APB clock frequency / 2
  RNG_JCLK_BYP_SRC:
    Use RNG clock (APB clock)
  RNG_JCLK_BYP_SEL:
    Use internal jitter clock
  RNG_RBGEN_BIT: RBG enabled
RNG_CTRL (04040058)
  RND_VAL: 04
  RND_WARM_CNT: 40058
RNG_FF_THRES: 00002
RNG_INT_MASK: interrupt enabledmbox0: <BCM2835 VideoCore Mailbox> mem
0x7e00b880-0x7e00b8bf irq 17 on simplebus0
gpio0: <BCM2708/2835 GPIO controller> mem 0x7e200000-0x7e2000b3 irq 18,19 on
simplebus0
gpiobus0: <OFW GPIO bus> on gpio0
gpioc0: <GPIO controller> on gpio0
uart0: <PrimeCell UART (PL011)> mem 0x7e201000-0x7e201fff irq 20 on simplebus0
uart0: console (115200,n,8,1)
spi0: <BCM2708/2835 SPI controller> mem 0x7e204000-0x7e204fff irq 21 on
simplebus0
spibus0: <OFW SPI bus> on spi0
spigen0: <SPI Generic IO> at cs 0 mode 0 on spibus0
spibus0: <unknown card> at cs 0 mode 0
spibus0: <unknown card> at cs 1 mode 0
iichb0: <BCM2708/2835 BSC controller> mem 0x7e804000-0x7e804fff irq 32 on
simplebus0
iicbus0: <OFW I2C bus> on iichb0
iic0: <I2C generic I/O> on iicbus0
bcm283x_dwcotg0: <DWC OTG 2.0 integrated USB controller (bcm283x)> mem
0x7e980000-0x7e98ffff,0x7e006000-0x7e006fff irq 38,39 on simplebus0
usbus0 on bcm283x_dwcotg0
sdhci_bcm0: <Broadcom 2708 SDHCI controller> mem 0x7e300000-0x7e3000ff irq 42
on simplebus0
mmc0: <MMC/SD bus> on sdhci_bcm0
vchiq0: <BCM2835 VCHIQ> mem 0x7e00b840-0x7e00b84e irq 45 on simplebus0
vchiq: local ver 8 (min 3), remote ver 8.
pcm0: <VCHIQ audio> on vchiq0
pmu0: <Performance Monitoring Unit> irq 46 on simplebus0
gpioled0: <GPIO LEDs> on ofwbus0
gpioled0: <led1> failed to map pin
cpulist0: <Open Firmware CPU Group> on ofwbus0
cpu0: <Open Firmware CPU> on cpulist0
cpu1: <Open Firmware CPU> on cpulist0
cpu2: <Open Firmware CPU> on cpulist0
cpu3: <Open Firmware CPU> on cpulist0
cryptosoft0: <software crypto>
Timecounters tick every 1.000 msec
usbus0: 480Mbps High Speed USB v2.0
ugen0.1: <DWCOTG OTG Root HUB> at usbus0
uhub0: <DWCOTG OTG Root HUB, class 9/0, rev 2.00/1.00, addr 1> on usbus0
bcmrng0: Too many underruns, resetting
bcmrng0: RNG stalled, disabling device
bcmrng0: Too many underruns, resetting
bcmrng0: RNG stalled, disabling device
bcmrng0: Too many underruns, resetting
bcmrng0: RNG stalled, disabling device

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