我买了块F1C100S的Nano核心板，接了喇叭后，声卡无输出，求救！
代码是下载的github上的主线代码：https://github.com/Lichee-Pi/linux.git
分支是：nano-5.2-tf
核心板启动后的log如下：

U-Boot 2018.01-05684-gab781d1e3e (Mar 21 2020 - 22:58:42 +0800) Allwinner Technology

CPU: Allwinner F Series (SUNIV)
Model: Lichee Pi Nano
DRAM: 32 MiB
MMC: SUNXI SD/MMC: 0
*** Warning - bad CRC, using default environment
In: serial@1c25000
Out: serial@1c25000
Err: serial@1c25000
Net: No ethernet found.
starting USB…
No controllers found
Hit any key to stop autoboot: 0
switch to partitions #0, OK
mmc0 is current device
Scanning mmc 0:1…
Found U-Boot script /boot.scr
reading /boot.scr
270 bytes read in 14 ms (18.6 KiB/s)

Executing script at 80c50000

reading suniv-f1c100s-rtu.dtb
10699 bytes read in 25 ms (417 KiB/s)
reading zImage
3917424 bytes read in 204 ms (18.3 MiB/s)

Flattened Device Tree blob at 80c00000

Booting using the fdt blob at 0×80c00000
Loading Device Tree to 816fa000, end 816ff9ca … OK

Starting kernel …

[ 0.000000] Booting Linux on physical CPU 0×0
[ 0.000000] Linux version 5.2.0-f1c100s-rtu+ (walter@K) (gcc version 8.3.0 (Buildroot 2019.08.3-00004-ge7e6988950
[ 0.000000] CPU: ARM926EJ-S [41069265] revision 5 (ARMv5TEJ), cr=0005317f
[ 0.000000] CPU: VIVT data cache, VIVT instruction cache
[ 0.000000] OF: fdt: Machine model: f1c100s-rtu
[ 0.000000] Memory policy: Data cache writeback
[ 0.000000] Built 1 zonelists, mobility grouping on. Total pages: 8128
[ 0.000000] Kernel command line: console=tty0 console=ttyS0,115200 panic=5 rootwait root=/dev/mmcblk0p2 rw
[ 0.000000] Dentry cache hash table entries: 4096 (order: 2, 16384 bytes)
[ 0.000000] Inode-cache hash table entries: 2048 (order: 1, 8192 bytes)
[ 0.000000] Memory: 22672K/32768K available (6144K kernel code, 242K rwdata, 1604K rodata, 1024K init, 240K bss,)
[ 0.000000] SLUB: HWalign=32, Order=0-3, MinObjects=0, CPUs=1, Nodes=1
[ 0.000000] NR_IRQS: 16, nr_irqs: 16, preallocated irqs: 16
[ 0.000000] random: get_random_bytes called from start_kernel+0×254/0×42c with crng_init=0
[ 0.000048] sched_clock: 32 bits at 24MHz, resolution 41ns, wraps every 89478484971ns
[ 0.000124] clocksource: timer: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 79635851949 ns
[ 0.000675] Console: colour dummy device 80×30
[ 0.001295] printk: console [tty0] enabled
[ 0.001395] Calibrating delay loop… 203.16 BogoMIPS (lpj=1015808)
[ 0.070270] pid_max: default: 32768 minimum: 301
[ 0.070710] Mount-cache hash table entries: 1024 (order: 0, 4096 bytes)
[ 0.070781] Mountpoint-cache hash table entries: 1024 (order: 0, 4096 bytes)
[ 0.072459] CPU: Testing write buffer coherency: ok
[ 0.074485] Setting up static identity map for 0×80100000 - 0×80100058
[ 0.076820] devtmpfs: initialized
[ 0.085322] clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 19112604462750000 ns
[ 0.085485] futex hash table entries: 256 (order: -1, 3072 bytes)
[ 0.085836] pinctrl core: initialized pinctrl subsystem
[ 0.087920] NET: Registered protocol family 16
[ 0.089414] DMA: preallocated 256 KiB pool for atomic coherent allocations
[ 0.091732] cpuidle: using governor menu
[ 0.148062] SCSI subsystem initialized
[ 0.148835] usbcore: registered new interface driver usbfs
[ 0.149072] usbcore: registered new interface driver hub
[ 0.149347] usbcore: registered new device driver usb
[ 0.149934] pps_core: LinuxPPS API ver. 1 registered
[ 0.150012] pps_core: Software ver. 5.3.6 - Copyright 2005-2007 Rodolfo Giometti <giometti@linux.it>
[ 0.150834] Advanced Linux Sound Architecture Driver Initialized.
[ 0.152516] clocksource: Switched to clocksource timer
[ 0.183192] NET: Registered protocol family 2
[ 0.184811] tcp_listen_portaddr_hash hash table entries: 512 (order: 0, 4096 bytes)
[ 0.184992] TCP established hash table entries: 1024 (order: 0, 4096 bytes)
[ 0.185094] TCP bind hash table entries: 1024 (order: 0, 4096 bytes)
[ 0.185179] TCP: Hash tables configured (established 1024 bind 1024)
[ 0.185501] UDP hash table entries: 256 (order: 0, 4096 bytes)
[ 0.185615] UDP-Lite hash table entries: 256 (order: 0, 4096 bytes)
[ 0.186154] NET: Registered protocol family 1
[ 0.187707] RPC: Registered named UNIX socket transport module.
[ 0.187818] RPC: Registered udp transport module.
[ 0.187867] RPC: Registered tcp transport module.
[ 0.187910] RPC: Registered tcp NFSv4.1 backchannel transport module.
[ 0.189006] NetWinder Floating Point Emulator V0.97 (double precision)
[ 0.191182] Initialise system trusted keyrings
[ 0.191859] workingset: timestamp_bits=30 max_order=13 bucket_order=0
[ 0.215680] jffs2: version 2.2. (NAND) �© 2001-2006 Red Hat, Inc.
[ 0.223858] Key type asymmetric registered
[ 0.223968] Asymmetric key parser ‘x509’ registered
[ 0.224185] Block layer SCSI generic (bsg) driver version 0.4 loaded (major 251)
[ 0.224275] io scheduler mq-deadline registered
[ 0.224324] io scheduler kyber registered
[ 0.226394] sun4i-usb-phy 1c13400.phy: Couldn’t request ID GPIO
[ 0.237853] suniv-f1c100s-pinctrl 1c20800.pinctrl: initialized sunXi PIO driver
[ 0.445896] Serial: 8250/16550 driver, 8 ports, IRQ sharing disabled
[ 0.451776] suniv-f1c100s-pinctrl 1c20800.pinctrl: 1c20800.pinctrl supply vcc-pe not found, using dummy regulator
[ 0.453772] printk: console [ttyS0] disabled
[ 0.474107] 1c25000.serial: ttyS0 at MMIO 0×1c25000 (irq = 27, base_baud = 6250000) is a 16550A
[ 0.887375] printk: console [ttyS0] enabled
[ 0.892800] suniv-f1c100s-pinctrl 1c20800.pinctrl: 1c20800.pinctrl supply vcc-pa not found, using dummy regulator
[ 0.925124] 1c25400.serial: ttyS1 at MMIO 0×1c25400 (irq = 28, base_baud = 6250000) is a 16550A
[ 0.956794] 1c25800.serial: ttyS2 at MMIO 0×1c25800 (irq = 29, base_baud = 6250000) is a 16550A
[ 0.970168] suniv-f1c100s-pinctrl 1c20800.pinctrl: 1c20800.pinctrl supply vcc-pd not found, using dummy regulator
[ 0.991024] SCSI Media Changer driver v0.25
[ 0.996969] suniv-f1c100s-pinctrl 1c20800.pinctrl: 1c20800.pinctrl supply vcc-pc not found, using dummy regulator
[ 1.010054] m25p80 spi0.0: found w25q256, expected w25q128
[ 1.016467] m25p80 spi0.0: w25q256 (32768 Kbytes)
[ 1.022026] 4 fixed-partitions partitions found on MTD device spi0.0
[ 1.028581] Creating 4 MTD partitions on “spi0.0”:
[ 1.033534] 0×000000000000-0×000000100000 : “u-boot”
[ 1.042325] 0×000000100000-0×000000110000 : “dtb”
[ 1.050856] 0×000000110000-0×000000510000 : “kernel”
[ 1.059758] 0×000000510000-0×000002000000 : “rootfs”
[ 1.069894] libphy: Fixed MDIO Bus: probed
[ 1.074394] usbcore: registered new interface driver asix
[ 1.079978] usbcore: registered new interface driver ax88179_178a
[ 1.086374] usbcore: registered new interface driver cdc_ether
[ 1.092399] usbcore: registered new interface driver net1080
[ 1.098328] usbcore: registered new interface driver cdc_subset
[ 1.104506] usbcore: registered new interface driver zaurus
[ 1.110304] usbcore: registered new interface driver cdc_ncm
[ 1.116101] ehci_hcd: USB 2.0 ‘Enhanced’ Host Controller (EHCI) Driver
[ 1.122721] ehci-platform: EHCI generic platform driver
[ 1.128365] ohci_hcd: USB 1.1 ‘Open’ Host Controller (OHCI) Driver
[ 1.134741] ohci-platform: OHCI generic platform driver
[ 1.140477] usbcore: registered new interface driver cdc_wdm
[ 1.146518] usbcore: registered new interface driver usb-storage
[ 1.153004] usbcore: registered new interface driver ch341
[ 1.158649] usbserial: USB Serial support registered for ch341-uart
[ 1.165190] usbcore: registered new interface driver cp210x
[ 1.170903] usbserial: USB Serial support registered for cp210x
[ 1.177078] usbcore: registered new interface driver ftdi_sio
[ 1.183058] usbserial: USB Serial support registered for FTDI USB Serial Device
[ 1.190576] usbcore: registered new interface driver option
[ 1.196394] usbserial: USB Serial support registered for GSM modem (1-port)
[ 1.203614] usbcore: registered new interface driver qcserial
[ 1.209506] usbserial: USB Serial support registered for Qualcomm USB modem
[ 1.218779] input: 1c23400.lradc as /devices/platform/soc/1c23400.lradc/input/input0
[ 1.227793] i2c /dev entries driver
[ 1.243188] rtc-isl1208 0-006f: registered as rtc0
[ 1.250219] suniv-f1c100s-pinctrl 1c20800.pinctrl: 1c20800.pinctrl supply vcc-pf not found, using dummy regulator
[ 1.288393] sunxi-mmc 1c0f000.mmc: initialized, max. request size: 16384 KB
[ 1.298824] usbcore: registered new interface driver usbhid
[ 1.304604] usbhid: USB HID core driver
[ 1.325690] NET: Registered protocol family 17
[ 1.332423] random: fast init done
[ 1.336362] Loading compiled-in X.509 certificates
[ 1.352925] suniv-f1c100s-pinctrl 1c20800.pinctrl: 1c20800.pinctrl supply vcc-pd not found, using dummy regulator
[ 1.364402] sun4i-backend 1e60000.display-backend: Couldn’t find matching frontend, frontend features disabled
[ 1.375379] sun4i-drm display-engine: bound 1e60000.display-backend (ops 0xc073b374)
[ 1.384570] sun4i-drm display-engine: bound 1c0c000.lcd-controller (ops 0xc0739fcc)
[ 1.392321] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
[ 1.399081] [drm] No driver support for vblank timestamp query.
[ 1.407000] [drm] Initialized sun4i-drm 1.0.0 20150629 for display-engine on minor 0
[ 1.656828] Console: switching to colour frame buffer device 100×30
[ 1.664054] mmc0: host does not support reading read-only switch, assuming write-enable
[ 1.668120] mmc0: new high speed SDHC card at address aaaa
[ 1.672907] mmcblk0: mmc0:aaaa SS08G 7.40 GiB
[ 1.717606] mmcblk0: p1 p2
[ 1.798230] sun4i-drm display-engine: fb0: sun4i-drmdrmfb frame buffer device
[ 1.821072] usb_phy_generic usb_phy_generic.0.auto: usb_phy_generic.0.auto supply vcc not found, using dummy regr
[ 1.861615] musb-hdrc musb-hdrc.1.auto: MUSB HDRC host driver
[ 1.882223] musb-hdrc musb-hdrc.1.auto: new USB bus registered, assigned bus number 1
[ 1.907442] hub 1-0:1.0: USB hub found
[ 1.925909] hub 1-0:1.0: 1 port detected
[ 1.947969] rtc-isl1208 0-006f: setting system clock to 2020-03-27T20:22:18 UTC (1585340538)
[ 1.971667] vcc5v0: disabling
[ 1.989005] ALSA device list:
[ 2.006149] #0: Loopback 1
[ 2.045027] EXT4-fs (mmcblk0p2): mounted filesystem with ordered data mode. Opts: (null)
[ 2.068187] VFS: Mounted root (ext4 filesystem) on device 179:2.
[ 2.098797] devtmpfs: mounted
[ 2.122321] Freeing unused kernel memory: 1024K
[ 2.141522] Run /sbin/init as init process
[ 2.325426] EXT4-fs (mmcblk0p2): re-mounted. Opts: (null)
Starting syslogd: OK
Starting klogd: OK
Running sysctl: OK
Starting mdev… OK

Initializing random number generator… [ 8.782162] random: dd: uninitialized urandom read (512 bytes read)
done.
Starting network: OK
[ 9.081912] zero gadget: Gadget Zero, version: Cinco de Mayo 2008
[ 9.101683] zero gadget: zero ready
[ 9.155385] GobiNet: Quectel_WCDMA&LTE_Linux&Android_GobiNet_Driver_V1.3.0
[ 9.176136] usbcore: registered new interface driver GobiNet

Welcome to Buildroot
buildroot login: [ 9.552620] usb 1-1: new high-speed USB device number 2 using musb-hdrc
[ 10.228478] asix 1-1:1.0 eth0: register ‘asix’ at usb-musb-hdrc.1.auto-1, ASIX AX88772B USB 2.0 Ethernet, 00:0e:d

Welcome to Buildroot
buildroot login: