[Bug]: trng set puf mode enable failure

[wangjianxin-canaan]

What happened

随机数模块很低概率初始化失败，打印如下栈：
[ 0.786791] 96010000.serial: ttyS1 at MMIO 0x96010000 (irq = 2, base_baud = 1562500) is a 16550A
[ 0.802224] k510-rng 9102c200.trng: set puf mode enable failure
[ 0.808255] k510-rng 9102c200.trng: failed to register hwrng
[ 0.814000] [K510_POWER]:power off sec_domain
[ 0.818416] k510-rng: probe of 9102c200.trng failed with error -16
[ 0.826089] start kendryte_dsi_probe
[ 0.829901] SYSCTL_CLK_DISPLAY_PIXEL is 107

......

Sysinit starting
/dev/mmcblk2p2 was not cleanly unmounted, check forced.
/dev/mmcblk2p2: 3103/32768 files (0.1% non-contiguous), 47805/131072 blocks
Wed Dec 1 10:00:00 CST 2010
Starting rngd: OK
[ 6.383696] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000000
[ 6.393082] Oops 1
[ 6.395389] Modules linked in:
[ 6.398488] CPU: 1 PID: 97 Comm: rngd Not tainted 4.17.0 #1
[ 6.404120] sepc: ffffffe0005a4fe0 ra : ffffffe0002c19ac sp : ffffffe0030f3c40
[ 6.411372] gp : ffffffe0008b1688 tp : ffffffe0059ba500 t0 : ffffffe00435f000
[ 6.418610] t1 : 000000200003b93c t2 : 000000200002dbd4 s0 : ffffffe0030f3c60
[ 6.425844] s1 : ffffffffffffffc0 a0 : 0000000000000011 a1 : 0000000000000000
[ 6.433084] a2 : 0000000000001000 a3 : ffffffe000784a69 a4 : 0000000000000000
[ 6.440324] a5 : ffffffe00435e011 a6 : ffffffe00435f000 a7 : 0000000000000000
[ 6.447564] s2 : ffffffe00435e000 s3 : ffffffe000854d98 s4 : ffffffe000784a68
[ 6.454794] s5 : ffffffe0006110b8 s6 : ffffffe0030f3e98 s7 : ffffffe000032800
[ 6.462024] s8 : ffffffe000034040 s9 : 0000000000001000 s10: 000000000001ab40
[ 6.467858] IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready
[ 6.469264] s11: fffffffffffff000 t3 : 000000000000e93c t4 : 0000000000000002
[ 6.482324] t5 : 0000000000000002 t6 : ffffffe00435e011
[ 6.487662] sstatus: 0000000200000120 sbadaddr: 0000000000000000 scause: 000000000000000d
[ 6.495872] CPU: 1 PID: 97 Comm: rngd Not tainted 4.17.0 #1
[ 6.501468] Call Trace:
[ 6.503987] [] walk_stackframe+0x0/0xa4
[ 6.509441] [] show_stack+0x2c/0x38
[ 6.514527] [] dump_stack+0x64/0x80
[ 6.519609] [] die+0x70/0xf8
[ 6.524131] [] do_page_fault+0x24c/0x358
[ 6.529669] [] ret_from_exception+0x0/0xc
[ 6.539576] --[ end trace a1fbc175e0eeefc1 ]--
[ 6.544380] Kernel panic - not syncing: Fatal exception

Reproduction steps

正常启动

Hardware board

k510 crb kit

Software version

No response

Bug frequency

1/1000000

Anything else

No response