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。
/ B2 S: a7 `% r4 R% m" H
+ T/ f: v" i# {) ?
$ J, _$ q* u2 {$ x. D; N5 e! c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
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。
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/ @1 M: i8 a" H$ H6 H

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U-Boot 2010.03 (Nov 26 2018 - 21:30:21)
4 n- A2 e7 c" y
CPU  : STM32F7 (Cortex-M7)
7 G. b: s3 i9 F7 c- b9 C: ]Freqs: SYSCLK=216MHz,HCLK=216MHz,PCLK1=54MHz,PCLK2=108MHz
! F. H+ O/ T9 q6 a: {" R% NDRAM:  64 MB
In:    serial
" T' |2 V8 M9 `" _$ J# QOut:   serial
3 ~+ B$ b( L  D& [" X+ d9 qErr:   serial
QSPI:  32 MB mapped at 0x90000000
' T% a3 h4 u. U% Z# O$ P1 T/ iNet:   miiphy_register done.
1 |3 I) o, t7 Z0 heth hw init done.
& r! P/ U7 S. V7 R6 G- B2 [% zSTM32_MAC
* y8 C! d- }1 ?# _3 w! nHit any key to stop autoboot:  0
; g2 G% K7 d) H% F. qBooting from QSPI
## Booting kernel from Legacy Image at c0007fc0 ...
   Image Name:   Linux-4.2.0
   Image Type:   ARM Linux Multi-File Image (uncompressed)
1 [2 y2 O" g/ c: A) C   Data Size:    7496295 Bytes =  7.1 MB
" O2 D; v4 p6 |& k, r6 i* N   Load Address: c0008000
) o& ~- i) y) @1 @   Entry Point:  c0008001
( K- b0 u6 V: K! X4 ?  }$ V   Contents:
& n# P/ K# c/ {+ k& L, @& K: }      Image 0: 7471388 Bytes =  7.1 MB
      Image 1: 24895 Bytes = 24.3 kB
; C2 R, D" [7 o3 s8 z* a   Verifying Checksum ... OK
1 Y+ d7 `* g; r  o## Flattened Device Tree from multi component Image at C0007FC0
   Booting using the fdt at 0xc0728128
) T# r7 u7 |  ~7 Y6 j5 |, b) m   Loading Multi-File Image ... OK
OK
WARNING: legacy format multi component image overwritten
6 ?6 m8 j1 I0 c" {. W) i   Loading Device Tree to c3ff6000, end c3fff13e ... OK
# K* y% ~) i/ f$ p, n" H
Starting kernel ...
$ Q. r* D+ j6 G6 b- y# t
Booting Linux on physical CPU 0x0
8 l) P2 o9 {: t5 }( l/ f- n$ gLinux version 4.2.0 (hw@localhost.localdomain) (gcc version 4.4.1 (Sourcery G++ Lite 2010
q1-189) ) #90 Tue Dec 4 03:32:33 EST 2018
) ?/ r4 c1 y6 P1 A1 }# D* uCPU: ARMv7-M [410fc271] revision 1 (ARMv7M), cr=00000000
CPU: WBA data cache, WBA instruction cache
( z6 @3 }- t" p# H% ?Machine model: EmCraft Systems STM32F7-SOM board
Built 1 zonelists in Zone order, mobility grouping on.  Total pages: 16256
7 c  m, o, Q: o  O) \# Z' oKernel command line: stm32_platform=stm32f7-disco console=ttyS0,115200 panic=10 ip=169.25
4.1.10:169.254.1.2:::stm32f7-disco：eth0：off
7 f5 ]3 f  L5 n& L* ~: LPID hash table entries: 256 (order: -2, 1024 bytes)
Dentry cache hash table entries: 8192 (order: 3, 32768 bytes)
! _0 g( H) W' Q% A4 MInode-cache hash table entries: 4096 (order: 2, 16384 bytes)
Memory: 56432K/65536K available (2523K kernel code, 181K rwdata, 588K rodata, 4000K init,
111K bss, 9104K reserved, 0K cma-reserved)
( w" N% P9 _+ y* G: V' I: FVirtual kernel memory layout:
    vector  : 0x00000000 - 0x00001000   (   4 kB)
) O" X& l% R$ ^3 O    fixmap  : 0xffc00000 - 0xfff00000   (3072 kB)
* n! a+ Y1 r( o+ N    vmalloc : 0x00000000 - 0xffffffff   (4095 MB)
& V: j; B1 f4 ^4 ^    lowmem  : 0xc0000000 - 0xc4000000   (  64 MB)
3 ^* _$ [1 |* y- A3 u9 s0 b      .text : 0xc0008000 - 0xc0312000   (3112 kB)
      .init : 0xc0312000 - 0xc06fa000   (4000 kB)
      .data : 0xc06fa000 - 0xc07277c0   ( 182 kB)
( H, v5 j" y  a5 T8 r       .bss : 0xc072811c - 0xc0743e84   ( 112 kB)
NR_IRQS:16 nr_irqs:16 16
/interrupt-controller@40013c00: 24 External IRQs detected
clocksource: arm_system_timer: mask: 0xffffff max_cycles: 0xffffff, max_idle_ns: 27651335
8 ns
ARM System timer initialized as clocksource
  o5 U( D+ a4 g, J/soc/timer@40000000: STM32 clockevent driver initialized (32 bits)
sched_clock: 32 bits at 100 Hz, resolution 10000000ns, wraps every 21474836475000000ns
Calibrating delay loop... 427.62 BogoMIPS (lpj=2138112)
pid_max: default: 4096 minimum: 301
Mount-cache hash table entries: 1024 (order: 0, 4096 bytes)
Mountpoint-cache hash table entries: 1024 (order: 0, 4096 bytes)
3 `- Q# D  s) t& G; \# ldevtmpfs: initialized
clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 1911260446275
' h5 r2 I2 Q5 z1 I0000 ns
pinctrl core: initialized pinctrl subsystem
NET: Registered protocol family 16
stm32-pinctrl pin-controller: nbanks = 11
* P* G% C9 p% K6 C" F- tstm32-pinctrl pin-controller: nfunctions = 20
; l$ k5 a7 E0 |1 I) _" jstm32-pinctrl pin-controller: ngroups = 23
stm32-pinctrl pin-controller: GPIOA bank added.
stm32-pinctrl pin-controller: GPIOB bank added.
stm32-pinctrl pin-controller: GPIOC bank added.
/ \& }' r% r$ ]7 ~stm32-pinctrl pin-controller: GPIOD bank added.
( c) `  p  H" }/ }stm32-pinctrl pin-controller: GPIOE bank added.
stm32-pinctrl pin-controller: GPIOF bank added.
: \2 w, g8 c+ h0 j2 l3 F# Nstm32-pinctrl pin-controller: GPIOG bank added.
stm32-pinctrl pin-controller: GPIOH bank added.
stm32-pinctrl pin-controller: GPIOI bank added.
stm32-pinctrl pin-controller: GPIOJ bank added.
stm32-pinctrl pin-controller: GPIOK bank added.
stm32-pinctrl pin-controller: Function[0         name:i2c_1,    groups:1]
8 |, G! s7 A  L: p4 v8 n: G# nstm32-pinctrl pin-controller: Function[1         name:i2c_2,    groups:1]
stm32-pinctrl pin-controller: Function[2         name:i2c_3,    groups:1]
! o% Y' z% Z, k/ b$ [/ sstm32-pinctrl pin-controller: Function[3         name:mac,      groups:2]
3 j% g# V8 @4 {/ Y! _9 j) Sstm32-pinctrl pin-controller: Function[4         name:sdio,     groups:1]
' U6 o3 G; Q. Q6 mstm32-pinctrl pin-controller: Function[5         name:spi_2,    groups:1]
& _6 q/ n% i. E. Astm32-pinctrl pin-controller: Function[6         name:spi_4,    groups:1]
$ U8 L: {5 G+ D6 @stm32-pinctrl pin-controller: Function[7         name:spi_5,    groups:1]
5 t+ W5 S3 \, Q" rstm32-pinctrl pin-controller: Function[8         name:usart1,   groups:1]
stm32-pinctrl pin-controller: Function[9         name:usart6,   groups:1]
' ~" i" U# D% C8 h$ |- t. _# x; S: gstm32-pinctrl pin-controller: Function[10        name:usart7,   groups:1]
stm32-pinctrl pin-controller: Function[11        name:usb_fs,   groups:1]
7 h. O- ^, Q) B5 |9 t0 n: @stm32-pinctrl pin-controller: Function[12        name:usb_hs,   groups:1]
. y: W8 [% o' r# P# |stm32-pinctrl pin-controller: Function[13        name:can_1,    groups:1]
stm32-pinctrl pin-controller: Function[14        name:adc1_in0_pin,     groups:1]
( `9 q" B* x( p" f5 Vstm32-pinctrl pin-controller: Function[15        name:dac_out2_pin,     groups:1]
stm32-pinctrl pin-controller: Function[16        name:ltdc,     groups:1]
stm32-pinctrl pin-controller: Function[17        name:sai_2,    groups:1]
3 K6 V& O& a  |2 q( w  Z- c1 sstm32-pinctrl pin-controller: Function[18        name:i2c_4,    groups:1]
4 d# u/ D7 ?# y. q( T0 t6 @" Pstm32-pinctrl pin-controller: Function[19        name:gpio,     groups:3]
stm32-dma 40026000.dma: STM32 DMA driver registered
) z5 S6 [+ ^; sstm32-dma 40026400.dma: STM32 DMA driver registered
: p$ q4 n3 |" C+ x9 \$ U* t. c% xSCSI subsystem initialized
& r6 j+ i! z9 v& o) B( busbcore: registered new interface driver usbfs
usbcore: registered new interface driver hub
* o* u' f) }( Eusbcore: registered new device driver usb
, c  \  ]9 W- esoc:phy_hs supply vcc not found, using dummy regulator
& j3 V: }4 \  }9 q7 lsoc:phy_fs supply vcc not found, using dummy regulator
$ l) j4 c  n7 r0 \6 g* K9 J% Ipps_core: LinuxPPS API ver. 1 registered
6 h0 x( R+ J- O3 ?pps_core: Software ver. 5.3.6 - Copyright 2005-2007 Rodolfo Giometti <giometti@linux.it>
! d/ S: x0 F- i  U* PPTP clock support registered
# w# W  c- F- R1 `' q: `! m2 y% u2 XAdvanced Linux Sound Architecture Driver Initialized.
2 T5 n8 \0 Z2 OBluetooth: Core ver 2.20
NET: Registered protocol family 31
Bluetooth: HCI device and connection manager initialized
Bluetooth: HCI socket layer initialized
4 a+ l+ m& e0 ]; x! @Bluetooth: L2CAP socket layer initialized
Bluetooth: SCO socket layer initialized
clocksource: Switched to clocksource arm_system_timer
NET: Registered protocol family 2
' W' s7 ~5 Y9 {' qTCP established hash table entries: 1024 (order: 0, 4096 bytes)
6 R# T& @5 ?9 y- N  b# vTCP bind hash table entries: 1024 (order: 0, 4096 bytes)
0 H0 w, [4 b/ q% \: j) h7 ~! |TCP: Hash tables configured (established 1024 bind 1024)
/ M8 I  `3 t7 x, {4 Z8 k8 }* vUDP hash table entries: 256 (order: 0, 4096 bytes)
UDP-Lite hash table entries: 256 (order: 0, 4096 bytes)
NET: Registered protocol family 1
! m, _# c2 x$ B9 Y7 q: m0 y' DRPC: Registered named UNIX socket transport module.
9 {& f% S1 P  [& IRPC: Registered udp transport module.
RPC: Registered tcp transport module.
RPC: Registered tcp NFSv4.1 backchannel transport module.
Power Management for STM32
futex hash table entries: 16 (order: -5, 192 bytes)
0 C& C6 L! O: r2 \! ~jffs2: version 2.2. (NAND) (SUMMARY)  漏 2001-2006 Red Hat, Inc.
fuse init (API version 7.23)
& c9 k; k* ^  r' K/ ]Block layer SCSI generic (bsg) driver version 0.4 loaded (major 250)
! m( P: O) l! h/ H3 e3 G% W3 G& K3 ^io scheduler noop registered
: U7 O8 w. b0 W1 ]# cio scheduler cfq registered (default)
7 t9 c& j8 k. y/ K: R- B- Rstm32-pinctrl pin-controller: maps: function gpio group pwms num 2
stm32-pwm pwm0: basing on TIM3.1(x16)
  ?+ a6 y* e1 Z- N- |2 \) {stm32-pinctrl pin-controller: maps: function ltdc group ltdc-0 num 29
. S5 H6 C' |5 M8 T- }1 _stm32_lcdfb 40016800.ltdc: fb0: fb device registered successfully
STM32 USART driver initialized
4 b- K/ D& C  Ystm32-pinctrl pin-controller: maps: function usart1 group usart1-0 num 3
40011000.serial: ttyS0 at MMIO 0x40011000 (irq = 34, base_baud = 6750000) is a stm32-usar
' v% k0 w* Q& K7 s& {" at
console [ttyS0] enabled
& m. t4 E4 q7 B: Vstm32-pinctrl pin-controller: maps: function usart6 group usart6-0 num 3
6 M. a4 v2 c# X. C40011400.serial: ttyS5 at MMIO 0x40011400 (irq = 35, base_baud = 6750000) is a stm32-usar
8 j. ?) Z) g' N! A2 ]t
! i* a! ^) h3 c1 J; @$ f5 Hnbd: registered device at major 43
) j/ E# D; r4 E: L- Bstm32-pinctrl pin-controller: maps: function dac_out2_pin group dac-0 num 2
stm32_dac 40007400.dac: dac1: no timer assigned, DMA functionality is not available
4 ^- Y, V5 d$ T  i6 Vstm32_dac 40007400.dac: created 1 character devices with MAJOR 248
0 {7 x. V: E1 {5 G/ o2 ofpart partitions found on MTD device physmap-stm-flash.0
Creating 2 MTD partitions on "physmap-stm-flash.0":
0x000000000000-0x000000020000 : "stm_flash_uboot"
, a5 S5 ^/ v' z& m3 N) d6 w% X0x000000040000-0x000000100000 : "stm_flash_unused"
stm32-pinctrl pin-controller: maps: function spi_5 group spi_5-0 num 4
stm32-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 l5 \- H; Z, e7 ustm32-pinctrl pin-controller: maps: function mac group mac_rmii num 10
; q) p4 i# n9 W. ], pstmmac - user ID: 0x10, Synopsys ID: 0x35
Ring mode enabled
DMA HW capability register supported
Enhanced/Alternate descriptors
        Enabled extended descriptors
1 R& |0 o5 G  n% r RX Checksum Offload Engine supported (type 2)
TX Checksum insertion supported
; K* f( X) T7 W) g Wake-Up On Lan supported
4 j6 H. s/ A4 C& j- U3 h3 W+ x Enable RX Mitigation via HW Watchdog Timer
% ?- c. _0 U3 K' l4 ]stm32-dwmac 40028000.ethernet eth0: No MDIO subnode found
6 f9 P, U$ M( a9 F/ `9 r+ b6 X9 G7 vlibphy: stmmac: probed
eth0: PHY ID 0007c0f1 at 0 IRQ POLL (stmmac-0:00) active
PPP generic driver version 2.4.2
PPP BSD Compression module registered
. @0 ]: g* Q5 Z) `PPP Deflate Compression module registered
" |6 V2 j7 E5 k$ Cusbcore: registered new interface driver rt2800usb
$ `( _0 c& I4 d. f3 }$ _stm32-pinctrl pin-controller: maps: function usb_hs group usb_hs-0 num 3
! y4 _( k, \" y, W. O1 B. }: A' idwc2 40040000.usb: DWC OTG Controller
dwc2 40040000.usb: new USB bus registered, assigned bus number 1
  z3 \$ x' i" |8 s" N* Qdwc2 40040000.usb: irq 56, io mem 0x00000000
usb usb1: New USB device found, idVendor=1d6b, idProduct=0002
usb usb1: New USB device strings: Mfr=3, Product=2, SerialNumber=1
1 x# ?  O. I% k% e* P) P" L& Zusb usb1: Product: DWC OTG Controller
" U3 e) }! |$ zusb usb1: Manufacturer: Linux 4.2.0 dwc2_hsotg
) G( C/ J/ K% l: F- ?) s3 V: Musb usb1: SerialNumber: 40040000.usb
; T* n' Z% K! N. Z# u" A1 ghub 1-0:1.0: USB hub found
hub 1-0:1.0: 1 port detected
/ h# n0 E! l( Z& {5 M3 a  Mstm32-pinctrl pin-controller: maps: function usb_fs group usb_fs-0 num 3
50000000.usb supply vusb_d not found, using dummy regulator
50000000.usb supply vusb_a not found, using dummy regulator
3 A- D2 f0 C1 D: wdwc2 50000000.usb: EPs: 6, dedicated fifos, 512 entries in SPRAM
$ k2 [- Z; M. w0 rdwc2 50000000.usb: DCFG=0x08200000, DCTL=0x00000002, DIEPMSK=0000000b
dwc2 50000000.usb: GAHBCFG=0x00000000, GHWCFG1=0x00000000
- T) y( L9 i8 w! {5 ldwc2 50000000.usb: GRXFSIZ=0x000000a0, GNPTXFSIZ=0x004000a0
& ~% v8 w2 l( i& u. h2 _) d* r7 Pdwc2 50000000.usb: DPTx[1] FSize=32, StAddr=0x000000e0
dwc2 50000000.usb: DPTx[2] FSize=64, StAddr=0x00000100
! E+ ~8 v  b- s* mdwc2 50000000.usb: DPTx[3] FSize=512, StAddr=0x00000800
dwc2 50000000.usb: DPTx[4] FSize=512, StAddr=0x00000a00
. ~/ J3 l* L' ~2 c3 W! Z1 Z* Gdwc2 50000000.usb: DPTx[5] FSize=512, StAddr=0x00000c00
0 h8 \; O! A# _dwc2 50000000.usb: ep0-in: EPCTL=0x00008000, SIZ=0x00000000, DMA=0x5abee5fb
0 G# a( h, E- e/ mdwc2 50000000.usb: ep0-out: EPCTL=0x00008000, SIZ=0x00000000, DMA=0x5abee5fb
9 U4 h# B$ X& b6 H, Ydwc2 50000000.usb: ep1-in: EPCTL=0x00000000, SIZ=0x00000000, DMA=0x5abee5fb
dwc2 50000000.usb: ep1-out: EPCTL=0x00000000, SIZ=0x00000000, DMA=0x5abee5fb
3 k( G$ m  A: a5 T8 ddwc2 50000000.usb: ep2-in: EPCTL=0x00000000, SIZ=0x00000000, DMA=0x5abee5fb
* c4 a+ r8 G7 N+ Z4 Vdwc2 50000000.usb: ep2-out: EPCTL=0x00000000, SIZ=0x00000000, DMA=0x5abee5fb
dwc2 50000000.usb: ep3-in: EPCTL=0x00000000, SIZ=0x00000000, DMA=0x5abee5fb
1 N- o- j& V6 e' s. x+ D. ndwc2 50000000.usb: ep3-out: EPCTL=0x00000000, SIZ=0x00000000, DMA=0x5abee5fb
  d  J4 N, H% j9 r5 Xdwc2 50000000.usb: ep4-in: EPCTL=0x00000000, SIZ=0x00000000, DMA=0x5abee5fb
dwc2 50000000.usb: ep4-out: EPCTL=0x00000000, SIZ=0x00000000, DMA=0x5abee5fb
3 Q& c% o" h: @* s. x- g9 d% |# Vdwc2 50000000.usb: ep5-in: EPCTL=0x00000000, SIZ=0x00000000, DMA=0x5abee5fb
% Q, J9 C: j8 Bdwc2 50000000.usb: ep5-out: EPCTL=0x00000000, SIZ=0x00000000, DMA=0x5abee5fb
dwc2 50000000.usb: DVBUSDIS=0x000017d7, DVBUSPULSE=000005b8
+ P% k3 h0 L3 V2 w- Musbcore: registered new interface driver cdc_acm
% X; g& s$ T) y" h4 T1 hcdc_acm: USB Abstract Control Model driver for USB modems and ISDN adapters
1 i( @; P  `# ~9 @& I* _  z/ a, x# U3 lusbcore: registered new interface driver uas
1 W9 g! H3 w$ B1 {3 t! T7 [usbcore: registered new interface driver usb-storage
g_serial gadget: Gadget Serial v2.4
/ d" \9 `$ \6 yg_serial gadget: g_serial ready
dwc2 50000000.usb: bound driver g_serial
i2c /dev entries driver
& O6 [1 R% E( L$ |% ]/ N* e: rstm32-pinctrl pin-controller: maps: function i2c_4 group i2c_4-0 num 3
bmp085 3-0077: Successfully initialized bmp085!
stm32f7-i2c 40006000.i2c: I2C Controller i2c-3 at 40006000,irq=58
Driver for 1-wire Dallas network protocol.
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
' l9 f8 U0 n1 X$ z. Ymmci-pl18x 40012c00.sdi: mmc0: PL180 manf 80 rev4 at 0x40012c00 irq 37,0 (pio)
3 P/ P) K* q, h+ _& |0 G. t  Mstm32-dma 40026400.dma: stm32_dma_of_xlate: unable to get channel 3 - was already request
ed
mmci-pl18x 40012c00.sdi: DMA channels RX dma1chan3, TX dma1chan3
stm32_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
hidraw: raw HID events driver (C) Jiri Kosina
usbcore: registered new interface driver usbhid
usbhid: USB HID core driver
stm32-pinctrl pin-controller: maps: function adc1_in0_pin group adc1-0 num 2
stm32f4-adc 40012000.adc: registered
stm32-pinctrl pin-controller: maps: function sai_2 group sai_2-0 num 5
stm32-dma 40026400.dma: stm32_dma_of_xlate: unable to get channel 4 - was already request
- [! R2 o8 |3 N( h4 s4 H4 |ed
: M2 {/ _: n1 ?+ ?stm32-asoc-card sound: failed to find codec platform device
stm32-asoc-card: probe of sound failed with error -22
) \/ N3 A' m- k9 ^; a1 c, g* qNET: Registered protocol family 17
$ x2 _6 ]& `( S! D0 p  d) ^can: controller area network core (rev 20120528 abi 9)
. l. P: o# [3 ?  uNET: Registered protocol family 29
can: raw protocol (rev 20120528)
can: broadcast manager protocol (rev 20120528 t)
can: netlink gateway (rev 20130117) max_hops=1
2 ?# X# |$ E, g7 ?" @Bluetooth: RFCOMM TTY layer initialized
Bluetooth: RFCOMM socket layer initialized
6 w9 Z6 M+ F) t: ]" fBluetooth: RFCOMM ver 1.11
* i- C7 `. T, w$ h# chctosys: unable to open rtc device (rtc0)
5 W, W3 }3 d8 Xvmmc: disabling
1 p- R  j% p, QALSA device list:
9 ]. c5 |! Y9 y& H$ A7 U% D  No soundcards found.
Freeing unused kernel memory: 4000K (c0312000 - c06fa000)
init started: BusyBox v1.24.2 (2018-11-22 20:35:58 EST)
9 |1 h+ G; p6 T( S6 H/ # amixer: Mixer attach default error: No such file or directory
stm32-dwmac 40028000.ethernet eth0: Link is Up - 100Mbps/Full - flow control rx/tx
  m( a: ?9 e% I, ?
! ~. a" E8 n0 i0 P1 ^, h1 ]8 G/ # free
/ ]5 S3 T" `4 r& P/ A; R' Z! n0 k             total       used       free     shared    buffers     cached
: e1 U: T/ e( K: [: j, v3 VMem:         60432       8140      52292          0          0       4792
0 f. q+ d( m/ m; E. E-/+ buffers/cache:       3348      57084
/ #
9 T0 @. S3 P. T  I3 P

% R/ F& U8 r3 }# n) S' y' v

哇哦！