前段时间ST推出了Value Line的STM32F750和H750两个系列，看了一下选型表，F750有LQFP144封装，正好适合我的STM32 linux板子。
& f8 C3 i# n) M" \' E& ~( L
于是，双十一买了几片。同时，我对我的linux板做了小幅改版：将SPI Flash容量扩大到32MB并连接到F750的QSPI
4 M4 j" ^1 U9 G" j( ^BANK1，添加了CAN收发器和接口，增加了两个I2C外设（温湿度传感器和气压传感器）。板子做回来后先焊了一片，调试过程还算比较顺利，现在u-boot和Linux都工作起来了，下面是系统启动log，F750速度还是相当快的（427.62
BogoMIPS，F429跑Linux只有35.84
BogoMIPS），QSPI的加载速度也很给力。下一步我准备多测试几种STM32外设的Linux
driver，emcraft现在的SDK比两三年前多了不少外设驱动，可以都试试看。
. o$ n# R3 M+ w5 g
- N5 j4 R- Z9 Q4 s% S

% L/ c! N6 x( K" L: j+ C

8 c* U# T7 F0 x. p" D
- W# \/ G/ y2 }# ^% u
U-Boot 2010.03 (Nov 26 2018 - 21:30:21)

CPU  : STM32F7 (Cortex-M7)
Freqs: SYSCLK=216MHz,HCLK=216MHz,PCLK1=54MHz,PCLK2=108MHz
Board: STM32F750 Rev 1.0
' Q4 y. s, R. HDRAM:  64 MB
# ?, Z2 e. o; Y7 YIn:    serial
Out:   serial
Err:   serial
% |7 u. _+ v+ t) _& fQSPI:  32 MB mapped at 0x90000000
/ }- _/ G# i5 k, t0 R9 }4 fNet:   miiphy_register done.
eth hw init done.
STM32_MAC
* h  Y* i# j* S+ xHit any key to stop autoboot:  0
- m+ v- y( v& ]5 V' hBooting from QSPI
## Booting kernel from Legacy Image at c0007fc0 ...
% `+ k2 Q/ n) n* p: o+ M! O: ~   Image Name:   Linux-4.2.0
2 }# }3 t& z; w# O, S& y0 \! |8 C   Image Type:   ARM Linux Multi-File Image (uncompressed)
   Data Size:    7496295 Bytes =  7.1 MB
   Load Address: c0008000
   Entry Point:  c0008001
   Contents:
4 K0 _3 N0 B* @0 l      Image 0: 7471388 Bytes =  7.1 MB
+ l8 P" _/ Q& z  S. f      Image 1: 24895 Bytes = 24.3 kB
; J+ Y4 p' X, B2 d   Verifying Checksum ... OK
## Flattened Device Tree from multi component Image at C0007FC0
" a9 @. k+ R2 {4 w" i4 ?. U8 o   Booting using the fdt at 0xc0728128
   Loading Multi-File Image ... OK
. b" z8 j5 D. R" l5 mOK
% R& N: u' [! S/ wWARNING: legacy format multi component image overwritten
   Loading Device Tree to c3ff6000, end c3fff13e ... OK
; P/ J! o( L: ]) O& v7 v9 F
" x. ~" |0 ^# b' [# B; o+ [Starting kernel ...Booting Linux on physical CPU 0x0
Linux version 4.2.0(gcc version 4.4.1 (Sourcery G++ Lite 2010
q1-189) ) #90 Tue Dec 4 03:32:33 EST 2018
0 R; q; ~  {: W( `% l$ HCPU: ARMv7-M [410fc271] revision 1 (ARMv7M), cr=00000000
% X6 M8 v. K. A# @! cCPU: WBA data cache, WBA instruction cache
Machine model: EmCraft Systems STM32F7-SOM board
7 b( U' k( X7 Y5 iBuilt 1 zonelists in Zone order, mobility grouping on.  Total pages: 16256
Kernel command line: stm32_platform=stm32f7-disco console=ttyS0,115200 panic=10 ip=169.25
) B; L( B( \8 j3 {' c4.1.10:169.254.1.2:::stm32f7-disco:eth0:ff
PID hash table entries: 256 (order: -2, 1024 bytes)
Dentry cache hash table entries: 8192 (order: 3, 32768 bytes)
Inode-cache hash table entries: 4096 (order: 2, 16384 bytes)
Memory: 56432K/65536K available (2523K kernel code, 181K rwdata, 588K rodata, 4000K init,
4 V' b# w, m" D& `( {- g8 t2 h* J% m111K bss, 9104K reserved, 0K cma-reserved)
Virtual kernel memory layout:
, Z  a; q% h& b5 h0 D$ B    vector  : 0x00000000 - 0x00001000   (   4 kB)
    fixmap  : 0xffc00000 - 0xfff00000   (3072 kB)
1 `+ Z. g% q7 m( c    vmalloc : 0x00000000 - 0xffffffff   (4095 MB)
8 O& ~  Y) ?" _    lowmem  : 0xc0000000 - 0xc4000000   (  64 MB)
      .text : 0xc0008000 - 0xc0312000   (3112 kB)
. [7 [2 ]1 Z. _4 ^% e% x7 ]  z( Q% [      .init : 0xc0312000 - 0xc06fa000   (4000 kB)
      .data : 0xc06fa000 - 0xc07277c0   ( 182 kB)
       .bss : 0xc072811c - 0xc0743e84   ( 112 kB)

NR_IRQS:16 nr_irqs:16 16
% J, R" S- Q! t( m; w/interrupt-controller@40013c00: 24 External IRQs detected
7 B0 i" J# |6 \, U: ^3 iclocksource: arm_system_timer: mask: 0xffffff max_cycles: 0xffffff, max_idle_ns: 27651335
9 X4 I7 D: A8 n# h% n8 ns
) C, z' |8 l/ K; _  K2 \( ]: d+ B) Y1 _ARM System timer initialized as clocksource
/soc/timer@40000000: STM32 clockevent driver initialized (32 bits)
$ G1 X: `" v6 E0 `" Q; ^sched_clock: 32 bits at 100 Hz, resolution 10000000ns, wraps every 21474836475000000ns
7 j/ y6 Y3 s' S& K2 sCalibrating delay loop... 427.62 BogoMIPS (lpj=2138112)
pid_max: default: 4096 minimum: 301
1 k5 A4 I( B7 o% S% K' _Mount-cache hash table entries: 1024 (order: 0, 4096 bytes)
" e3 o9 L& B% M1 G1 K# eMountpoint-cache hash table entries: 1024 (order: 0, 4096 bytes)
8 D. x* D7 E" g* r" `1 Xdevtmpfs: initialized
clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 1911260446275
0000 ns
4 P4 d; f- n, j1 ?# `# Ppinctrl core: initialized pinctrl subsystem
NET: Registered protocol family 16
stm32-pinctrl pin-controller: nbanks = 11
stm32-pinctrl pin-controller: nfunctions = 20
! }0 N9 b( w) q0 g% ystm32-pinctrl pin-controller: ngroups = 23
' A$ q3 X8 w* F9 kstm32-pinctrl pin-controller: GPIOA bank added.
; }+ {- `3 g) f3 z4 i( Hstm32-pinctrl pin-controller: GPIOB bank added.
stm32-pinctrl pin-controller: GPIOC bank added.
' H$ B2 B- W( q) r) n! o4 fstm32-pinctrl pin-controller: GPIOD bank added.
* J' }* t6 Z  s1 b3 ^# kstm32-pinctrl pin-controller: GPIOE bank added.
stm32-pinctrl pin-controller: GPIOF bank added.
stm32-pinctrl pin-controller: GPIOG bank added.
) _, i# P, Y! f3 Astm32-pinctrl pin-controller: GPIOH bank added.
stm32-pinctrl pin-controller: GPIOI bank added.
% s$ i/ D) D" W$ Pstm32-pinctrl pin-controller: GPIOJ bank added.
stm32-pinctrl pin-controller: GPIOK bank added.
stm32-pinctrl pin-controller: Function[0         name:i2c_1,    groups:1]
stm32-pinctrl pin-controller: Function[1         name:i2c_2,    groups:1]
stm32-pinctrl pin-controller: Function[2         name:i2c_3,    groups:1]
5 M  r# S: h2 H+ ^stm32-pinctrl pin-controller: Function[3         name:mac,      groups:2]
! @/ Q* {$ l$ w1 y) H3 Hstm32-pinctrl pin-controller: Function[4         name:sdio,     groups:1]
* W/ S- R  a, ?3 Estm32-pinctrl pin-controller: Function[5         name:spi_2,    groups:1]
stm32-pinctrl pin-controller: Function[6         name:spi_4,    groups:1]
stm32-pinctrl pin-controller: Function[7         name:spi_5,    groups:1]
/ G9 f0 p4 Y/ X. ^- Nstm32-pinctrl pin-controller: Function[8         name:usart1,   groups:1]
stm32-pinctrl pin-controller: Function[9         name:usart6,   groups:1]
stm32-pinctrl pin-controller: Function[10        name:usart7,   groups:1]
3 u3 n# o' o  z( |' r0 Mstm32-pinctrl pin-controller: Function[11        name:usb_fs,   groups:1]
stm32-pinctrl pin-controller: Function[12        name:usb_hs,   groups:1]
1 x4 h2 G4 r7 `4 u! v, s8 O3 F1 x( V- Jstm32-pinctrl pin-controller: Function[13        name:can_1,    groups:1]
stm32-pinctrl pin-controller: Function[14        name:adc1_in0_pin,     groups:1]
stm32-pinctrl pin-controller: Function[15        name:dac_out2_pin,     groups:1]
+ M& J9 C  k1 a) Y9 \stm32-pinctrl pin-controller: Function[16        name:ltdc,     groups:1]
9 g7 a7 U! m7 s5 K- C3 B7 T- Kstm32-pinctrl pin-controller: Function[17        name:sai_2,    groups:1]
2 t  a. P& w/ P1 _1 Lstm32-pinctrl pin-controller: Function[18        name:i2c_4,    groups:1]
, Q) b0 S4 n9 D6 p7 k6 Sstm32-pinctrl pin-controller: Function[19        name:gpio,     groups:3]
  o% N; ?( C: k1 p. O) V9 U# wstm32-dma 40026000.dma: STM32 DMA driver registered
- V$ p3 X6 x* a( dstm32-dma 40026400.dma: STM32 DMA driver registered
SCSI subsystem initialized
- N0 M/ ~$ |# z5 m7 Vusbcore: registered new interface driver usbfs
usbcore: registered new interface driver hub
5 I% a8 o& _: z8 |  f7 Fusbcore: registered new device driver usb
soc:phy_hs supply vcc not found, using dummy regulator
soc:phy_fs supply vcc not found, using dummy regulator
pps_core: LinuxPPS API ver. 1 registered
pps_core: Software ver. 5.3.6 - Copyright 2005-2007 Rodolfo Giometti <giometti@linux.it>
. P8 n2 _0 c; `3 t! w7 rPTP clock support registered
* h8 ~/ C5 k% d6 y5 uAdvanced Linux Sound Architecture Driver Initialized.
/ E; Z# a' R4 q- u# y8 _# u+ iBluetooth: Core ver 2.20
NET: Registered protocol family 31
Bluetooth: HCI device and connection manager initialized
Bluetooth: HCI socket layer initialized
7 g8 ?& p' L, A$ A% x! vBluetooth: L2CAP socket layer initialized
Bluetooth: SCO socket layer initialized
clocksource: Switched to clocksource arm_system_timer
# K, B7 `4 W: I2 @: r6 JNET: Registered protocol family 2
TCP established hash table entries: 1024 (order: 0, 4096 bytes)
) N4 C+ D( ?- R" _3 _* kTCP bind hash table entries: 1024 (order: 0, 4096 bytes)
TCP: Hash tables configured (established 1024 bind 1024)
  C9 `$ r: C! k4 L* f  y% Q5 B# a8 CUDP hash table entries: 256 (order: 0, 4096 bytes)
UDP-Lite hash table entries: 256 (order: 0, 4096 bytes)
. S2 y/ r9 j& y! K- ^NET: Registered protocol family 1
) n( d. o# w" z& S1 aRPC: Registered named UNIX socket transport module.
RPC: Registered udp transport module.
; Z$ m9 I4 u0 k, w4 W/ O, G3 pRPC: Registered tcp transport module.
' ^1 r! v$ k* U; zRPC: Registered tcp NFSv4.1 backchannel transport module.
* m. m5 H2 H: ?5 j7 x  x* B5 W; ZPower Management for STM32
futex hash table entries: 16 (order: -5, 192 bytes)
jffs2: version 2.2. (NAND) (SUMMARY)  漏 2001-2006 Red Hat, Inc.
; [8 ]- o2 x! p1 o) U. \: {. ~fuse init (API version 7.23)
Block layer SCSI generic (bsg) driver version 0.4 loaded (major 250)
1 _3 _$ D3 z$ Uio scheduler noop registered
io scheduler cfq registered (default)
stm32-pinctrl pin-controller: maps: function gpio group pwms num 2
6 K" F; u6 D. }- x' x" t' R( f/ ~stm32-pwm pwm0: basing on TIM3.1(x16)
% I5 I$ ?; S$ u  y7 Istm32-pinctrl pin-controller: maps: function ltdc group ltdc-0 num 29
stm32_lcdfb 40016800.ltdc: fb0: fb device registered successfully
9 i% o! c, [: V. s/ OSTM32 USART driver initialized
3 q6 F- J: a, ^& P, l! d! Wstm32-pinctrl pin-controller: maps: function usart1 group usart1-0 num 3
4 z8 z% t) p  N6 z40011000.serial: ttyS0 at MMIO 0x40011000 (irq = 34, base_baud = 6750000) is a stm32-usar
t
6 X' y# c* k( W5 G9 ?& P6 @console [ttyS0] enabled
# v7 [* d* N: p# \+ f" `* xstm32-pinctrl pin-controller: maps: function usart6 group usart6-0 num 3
40011400.serial: ttyS5 at MMIO 0x40011400 (irq = 35, base_baud = 6750000) is a stm32-usar
! h  x7 ?: `* W- i- u- H% [t
9 O% l' x# x4 [* j9 H3 Nnbd: registered device at major 43
: l4 _8 w" m+ Q) _5 I, }stm32-pinctrl pin-controller: maps: function dac_out2_pin group dac-0 num 2
0 g  p: b& K1 _stm32_dac 40007400.dac: dac1: no timer assigned, DMA functionality is not available
; ~6 c' W/ b# l4 b' i9 r* `" kstm32_dac 40007400.dac: created 1 character devices with MAJOR 248
2 ofpart partitions found on MTD device physmap-stm-flash.0
6 H9 S/ }% w* ?" X' |Creating 2 MTD partitions on "physmap-stm-flash.0":
0x000000000000-0x000000020000 : "stm_flash_uboot"
0x000000040000-0x000000100000 : "stm_flash_unused"
2 b5 }$ \4 A# J* K7 v; x( Qstm32-pinctrl pin-controller: maps: function spi_5 group spi_5-0 num 4
8 Z+ s5 A0 x3 I! C3 S& Sstm32-spi 40015000.spi: SPI Controller 4 at 40015000,irq=38,hz=108000000
CAN device driver interface
stm32-pinctrl pin-controller: maps: function can_1 group can_1-0 num 3
stm32-can 40006400.can: device registered (reg=40006400, irq=31)
; |2 U) q9 k6 l# Q2 t3 H" }3 Ustm32-pinctrl pin-controller: maps: function mac group mac_rmii num 10
stmmac - user ID: 0x10, Synopsys ID: 0x35
) v1 I3 d. e% y1 e( f Ring mode enabled
8 d8 @/ M3 I6 T6 L( j DMA HW capability register supported
2 [& o$ Y3 c: Z+ o Enhanced/Alternate descriptors
& ?5 {5 Z7 _% t& f8 v! k7 H; S2 G        Enabled extended descriptors
- c. q% q, t5 f; f  ^  R7 U RX Checksum Offload Engine supported (type 2)
TX Checksum insertion supported
: I1 N2 V% m) z: t7 g0 F Wake-Up On Lan supported
$ q* s3 a* R0 p% \9 X# R% j: u Enable RX Mitigation via HW Watchdog Timer
5 u$ |% ~( W/ c( T' tstm32-dwmac 40028000.ethernet eth0: No MDIO subnode found
libphy: stmmac: probed
eth0: PHY ID 0007c0f1 at 0 IRQ POLL (stmmac-0:00) active
! U9 u& z3 M3 z+ f* bPPP generic driver version 2.4.2
! ~" ]5 [: O, B8 EPPP BSD Compression module registered
) P1 c  w" ], P) g9 E1 }+ ~PPP Deflate Compression module registered
8 ^/ d+ F7 o5 k. zusbcore: registered new interface driver rt2800usb
stm32-pinctrl pin-controller: maps: function usb_hs group usb_hs-0 num 3
" B( j& }1 Q/ d7 ?0 [dwc2 40040000.usb: DWC OTG Controller
dwc2 40040000.usb: new USB bus registered, assigned bus number 1
dwc2 40040000.usb: irq 56, io mem 0x00000000
usb usb1: New USB device found, idVendor=1d6b, idProduct=0002
! }; Z" n* t2 Y5 A$ zusb usb1: New USB device strings: Mfr=3, Product=2, SerialNumber=1
usb usb1: Product: DWC OTG Controller
$ m2 `2 R9 q# Eusb usb1: Manufacturer: Linux 4.2.0 dwc2_hsotg
usb usb1: SerialNumber: 40040000.usb
. H2 e! V& y5 |) a- H: h# whub 1-0:1.0: USB hub found
: w  x# A7 W+ ^hub 1-0:1.0: 1 port detected
- `' c# S; U  ~5 P+ H( g; |: Istm32-pinctrl pin-controller: maps: function usb_fs group usb_fs-0 num 3
" v9 B- g* v) t: K" p50000000.usb supply vusb_d not found, using dummy regulator
50000000.usb supply vusb_a not found, using dummy regulator
dwc2 50000000.usb: EPs: 6, dedicated fifos, 512 entries in SPRAM
dwc2 50000000.usb: DCFG=0x08200000, DCTL=0x00000002, DIEPMSK=0000000b
+ O' N$ F' X. T7 u1 bdwc2 50000000.usb: GAHBCFG=0x00000000, GHWCFG1=0x00000000
9 a1 \# G! h8 `& I) Z6 c- D$ pdwc2 50000000.usb: GRXFSIZ=0x000000a0, GNPTXFSIZ=0x004000a0
dwc2 50000000.usb: DPTx[1] FSize=32, StAddr=0x000000e0
" d  S" V* \, i8 u& ]dwc2 50000000.usb: DPTx[2] FSize=64, StAddr=0x00000100
) Q9 q3 P3 {& p3 ?4 [+ u8 Z6 F1 Wdwc2 50000000.usb: DPTx[3] FSize=512, StAddr=0x00000800
3 i% X2 J$ k1 q/ pdwc2 50000000.usb: DPTx[4] FSize=512, StAddr=0x00000a00
dwc2 50000000.usb: DPTx[5] FSize=512, StAddr=0x00000c00
dwc2 50000000.usb: ep0-in: EPCTL=0x00008000, SIZ=0x00000000, DMA=0x5abee5fb
4 O+ L& B$ C2 y* w6 \8 Jdwc2 50000000.usb: ep0-out: EPCTL=0x00008000, SIZ=0x00000000, DMA=0x5abee5fb
dwc2 50000000.usb: ep1-in: EPCTL=0x00000000, SIZ=0x00000000, DMA=0x5abee5fb
# u' \6 b5 D/ d; Odwc2 50000000.usb: ep1-out: EPCTL=0x00000000, SIZ=0x00000000, DMA=0x5abee5fb
dwc2 50000000.usb: ep2-in: EPCTL=0x00000000, SIZ=0x00000000, DMA=0x5abee5fb
0 D- ]" d" V( u* b% Udwc2 50000000.usb: ep2-out: EPCTL=0x00000000, SIZ=0x00000000, DMA=0x5abee5fb
( ~3 X1 K. k* e' `7 Ndwc2 50000000.usb: ep3-in: EPCTL=0x00000000, SIZ=0x00000000, DMA=0x5abee5fb
3 b" H- d9 Y7 G" jdwc2 50000000.usb: ep3-out: EPCTL=0x00000000, SIZ=0x00000000, DMA=0x5abee5fb
7 s" w  Z' }% Q# l( i$ wdwc2 50000000.usb: ep4-in: EPCTL=0x00000000, SIZ=0x00000000, DMA=0x5abee5fb
% q6 @. u2 k' X0 B% j- Z/ l9 ?dwc2 50000000.usb: ep4-out: EPCTL=0x00000000, SIZ=0x00000000, DMA=0x5abee5fb
dwc2 50000000.usb: ep5-in: EPCTL=0x00000000, SIZ=0x00000000, DMA=0x5abee5fb
3 F  P6 N: |6 P2 ~4 o4 ?3 ddwc2 50000000.usb: ep5-out: EPCTL=0x00000000, SIZ=0x00000000, DMA=0x5abee5fb
9 M" i" u: i) p, O2 ldwc2 50000000.usb: DVBUSDIS=0x000017d7, DVBUSPULSE=000005b8
usbcore: registered new interface driver cdc_acm
* \5 p+ f/ n( f0 `# scdc_acm: USB Abstract Control Model driver for USB modems and ISDN adapters
usbcore: registered new interface driver uas
2 c* ~5 }5 r" k! V" \( k: H: y! Zusbcore: registered new interface driver usb-storage
# d+ T  W$ d. jg_serial gadget: Gadget Serial v2.4
g_serial gadget: g_serial ready
( r! G; r7 G9 g& ]( j8 idwc2 50000000.usb: bound driver g_serial
i2c /dev entries driver
$ g0 |* m* l' y1 a& kstm32-pinctrl pin-controller: maps: function i2c_4 group i2c_4-0 num 3
8 e2 }# S3 S9 G/ S& jbmp085 3-0077: Successfully initialized bmp085!
4 p! w& X; }8 G" W5 N2 Pstm32f7-i2c 40006000.i2c: I2C Controller i2c-3 at 40006000,irq=58
# y& Q- U  o) lDriver for 1-wire Dallas network protocol.
" g* F: _6 q4 R$ q9 \usbcore: registered new interface driver btusb
stm32-pinctrl pin-controller: maps: function sdio group sdio-0 num 7
mmci-pl18x 40012c00.sdi: Got CD GPIO
mmci-pl18x 40012c00.sdi: mmc0: PL180 manf 80 rev4 at 0x40012c00 irq 37,0 (pio)
7 W  M0 N' u2 J# J* m* m- W! C+ O- |stm32-dma 40026400.dma: stm32_dma_of_xlate: unable to get channel 3 - was already request
# R/ ^$ O# K/ ]( v4 p0 Ded
) v' @$ D9 X5 C( e3 n7 Rmmci-pl18x 40012c00.sdi: DMA channels RX dma1chan3, TX dma1chan3
) V& j: `* C2 `. P: @3 Lstm32_gpio_to_irq: Event line 3 now points to fire interrupts from bank G
stm32-pinctrl pin-controller: maps: function gpio group outs num 2
+ V+ P: ^1 S  u' l$ y1 {hidraw: raw HID events driver (C) Jiri Kosina
* Q. ]0 t! T& {% }; J# |usbcore: registered new interface driver usbhid
usbhid: USB HID core driver
/ q. q5 V# B8 b7 N# p4 D# I, ostm32-pinctrl pin-controller: maps: function adc1_in0_pin group adc1-0 num 2
7 e" D) o4 L/ ?7 D: qstm32f4-adc 40012000.adc: registered
stm32-pinctrl pin-controller: maps: function sai_2 group sai_2-0 num 5
8 U$ G5 T) U/ k; A' [stm32-dma 40026400.dma: stm32_dma_of_xlate: unable to get channel 4 - was already request
5 ^( U% X) _# jed
6 l5 X. }( w4 i5 lstm32-asoc-card sound: failed to find codec platform device
! |9 _4 C6 N' P" b7 G6 c# X3 |" fstm32-asoc-card: probe of sound failed with error -22
# }/ U% V2 t+ s" e. t$ z" C3 wNET: Registered protocol family 17
can: controller area network core (rev 20120528 abi 9)
NET: Registered protocol family 29
$ l+ B! \+ l- c! B" n  `2 h! {% Ccan: raw protocol (rev 20120528)
can: broadcast manager protocol (rev 20120528 t)
can: netlink gateway (rev 20130117) max_hops=1
Bluetooth: RFCOMM TTY layer initialized
. y; r% f1 [; z& n: [Bluetooth: RFCOMM socket layer initialized
1 u, j- L' G8 [8 e( cBluetooth: RFCOMM ver 1.11
hctosys: unable to open rtc device (rtc0)
vmmc: disabling
ALSA device list:
  No soundcards found.
Freeing unused kernel memory: 4000K (c0312000 - c06fa000)
init started: BusyBox v1.24.2 (2018-11-22 20:35:58 EST)
/ # amixer: Mixer attach default error: No such file or directory
stm32-dwmac 40028000.ethernet eth0: Link is Up - 100Mbps/Full - flow control rx/tx
% ]! C- W1 [0 Y0 Q* G& K
/ # free
             total       used       free     shared    buffers     cached
# j2 H7 ~' w! q" z$ ~Mem:         60432       8140      52292          0          0       4792
-/+ buffers/cache:       3348      57084
) Z# K5 P+ G9 C0 f9 U2 @1 Y/ #

; o0 j+ Q- a+ \9 {

: o8 Z5 x; [6 F  A' A' |