How change the crystal from 24MHz to 19.2MHz in Linux

Uncompressing Linux... done, booting the kernel.
[    0.000000] Initializing cgroup subsys cpuset
[    0.000000] Initializing cgroup subsys cpu
[    0.000000] Linux version 3.2.0 (lizq@Ubuntu10044) (gcc version 4.5.3 20110311 (prerelease) (GCC) ) #2 Thu Nov 20 20:35:59 CST 2014
[    0.000000] CPU: ARMv7 Processor [413fc082] revision 2 (ARMv7), cr=10c53c7d
[    0.000000] CPU: PIPT / VIPT nonaliasing data cache, VIPT aliasing instruction cache
[    0.000000] Machine: am335xevm
[    0.000000] Memory policy: ECC disabled, Data cache writeback
[    0.000000] AM335X ES2.1 (neon )
[    0.000000] Built 1 zonelists in Zone order, mobility grouping on.  Total pages: 65024
[    0.000000] Kernel command line: console=ttyO0,115200n8 spi_autoboot_flag=0 rootdelay=3 root=/dev/nfs nfsroot=192.168.6.163:/tftpboot/rootfs,nolock rw ip=dhcp
[    0.000000] PID hash table entries: 1024 (order: 0, 4096 bytes)
[    0.000000] Dentry cache hash table entries: 32768 (order: 5, 131072 bytes)
[    0.000000] Inode-cache hash table entries: 16384 (order: 4, 65536 bytes)
[    0.000000] allocated 1048576 bytes of page_cgroup
[    0.000000] please try 'cgroup_disable=memory' option if you don't want memory cgroups
[    0.000000] Memory: 256MB = 256MB total
[    0.000000] Memory: 251904k/251904k available, 10240k reserved, 0K highmem
[    0.000000] Virtual kernel memory layout:
[    0.000000]     vector  : 0xffff0000 - 0xffff1000   (   4 kB)
[    0.000000]     fixmap  : 0xfff00000 - 0xfffe0000   ( 896 kB)
[    0.000000]     vmalloc : 0xd0800000 - 0xff000000   ( 744 MB)
[    0.000000]     lowmem  : 0xc0000000 - 0xd0000000   ( 256 MB)
[    0.000000]     modules : 0xbf000000 - 0xc0000000   (  16 MB)
[    0.000000]       .text : 0xc0008000 - 0xc05f3000   (6060 kB)
[    0.000000]       .init : 0xc05f3000 - 0xc0630000   ( 244 kB)
[    0.000000]       .data : 0xc0630000 - 0xc0692e38   ( 396 kB)
[    0.000000]        .bss : 0xc0692e5c - 0xc06c316c   ( 193 kB)
[    0.000000] NR_IRQS:396
[    0.000000] IRQ: Found an INTC at 0xfa200000 (revision 5.0) with 128 interrupts
[    0.000000] Total of 128 interrupts on 1 active controller
[    0.000000] OMAP clockevent source: GPTIMER2 at 19200000 Hz
[    0.000000] OMAP clocksource: GPTIMER1 at 32768 Hz
[    0.000000] sched_clock: 32 bits at 32kHz, resolution 30517ns, wraps every 131071999ms
[    0.000000] Console: colour dummy device 80x30
[    0.000122] Calibrating delay loop... 603.34 BogoMIPS (lpj=3016704)
[    0.058349] pid_max: default: 32768 minimum: 301
[    0.058502] Security Framework initialized
[    0.058624] Mount-cache hash table entries: 512
[    0.059112] Initializing cgroup subsys debug
[    0.059112] Initializing cgroup subsys cpuacct
[    0.059143] Initializing cgroup subsys memory
[    0.059204] Initializing cgroup subsys devices
[    0.059204] Initializing cgroup subsys freezer
[    0.059204] Initializing cgroup subsys blkio
[    0.059265] CPU: Testing write buffer coherency: ok
[    0.060272] devtmpfs: initialized
[    0.081146] omap_hwmod: gfx: failed to hardreset
[    0.098266] omap_hwmod: pruss: failed to hardreset
[    0.099731] print_constraints: dummy: 
[    0.100158] NET: Registered protocol family 16
[    0.102874] OMAP GPIO hardware version 0.1
[    0.105926] omap_mux_init: Add partition: #1: core, flags: 0
[    0.108306]  omap_i2c.1: alias fck already exists
[    0.109527]  omap2_mcspi.1: alias fck already exists
[    0.109802]  omap2_mcspi.2: alias fck already exists
[    0.110046] omap_init_sham: platform not supported
[    0.110076] omap_init_aes: platform not supported
[    0.110168]  edma.0: alias fck already exists
[    0.110168]  edma.0: alias fck already exists
[    0.110198]  edma.0: alias fck already exists
[    0.133911] bio: create slab <bio-0> at 0
[    0.136596] SCSI subsystem initialized
[    0.138763] usbcore: registered new interface driver usbfs
[    0.139190] usbcore: registered new interface driver hub
[    0.139434] usbcore: registered new device driver usb
[    0.139801] registerd cppi-dma Intr @ IRQ 17
[    0.139831] Cppi41 Init Done Qmgr-base(d087a000) dma-base(d0878000)
[    0.139831] Cppi41 Init Done
[    0.139862] musb-ti81xx musb-ti81xx: musb0, board_mode=0x13, plat_mode=0x3
[    0.140228] musb-ti81xx musb-ti81xx: musb1, board_mode=0x13, plat_mode=0x1
[    0.158447] omap_i2c omap_i2c.1: bus 1 rev2.4.0 at 100 kHz
[    0.162536] Switching to clocksource gp timer
[    0.185302] musb-hdrc: version 6.0, ?dma?, otg (peripheral+host)
[    0.185516] musb-hdrc musb-hdrc.0: dma type: dma-cppi41
[    0.185943] MUSB0 controller's USBSS revision = 4ea20800
[    0.185974] musb0: Enabled SW babble control
[    0.187194] musb-hdrc musb-hdrc.0: USB OTG mode controller at d083c000 using DMA, IRQ 18
[    0.187408] musb-hdrc musb-hdrc.1: dma type: dma-cppi41
[    0.187774] MUSB1 controller's USBSS revision = 4ea20800
[    0.187805] musb1: Enabled SW babble control
[    0.188385] musb-hdrc musb-hdrc.1: MUSB HDRC host driver
[    0.188507] musb-hdrc musb-hdrc.1: new USB bus registered, assigned bus number 1
[    0.188690] usb usb1: New USB device found, idVendor=1d6b, idProduct=0002
[    0.188690] usb usb1: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[    0.188720] usb usb1: Product: MUSB HDRC host driver
[    0.188720] usb usb1: Manufacturer: Linux 3.2.0 musb-hcd
[    0.188751] usb usb1: SerialNumber: musb-hdrc.1
[    0.189941] hub 1-0:1.0: USB hub found
[    0.189971] hub 1-0:1.0: 1 port detected
[    0.190765] musb-hdrc musb-hdrc.1: USB Host mode controller at d083e800 using DMA, IRQ 19
[    0.191314] NET: Registered protocol family 2
[    0.191558] IP route cache hash table entries: 2048 (order: 1, 8192 bytes)
[    0.192016] TCP established hash table entries: 8192 (order: 4, 65536 bytes)
[    0.192199] TCP bind hash table entries: 8192 (order: 3, 32768 bytes)
[    0.192321] TCP: Hash tables configured (established 8192 bind 8192)
[    0.192321] TCP reno registered
[    0.192352] UDP hash table entries: 256 (order: 0, 4096 bytes)
[    0.192382] UDP-Lite hash table entries: 256 (order: 0, 4096 bytes)
[    0.192687] NET: Registered protocol family 1
[    0.193023] RPC: Registered named UNIX socket transport module.
[    0.193054] RPC: Registered udp transport module.
[    0.193054] RPC: Registered tcp transport module.
[    0.193084] RPC: Registered tcp NFSv4.1 backchannel transport module.
[    0.193328] NetWinder Floating Point Emulator V0.97 (double precision)
[    0.194000] cpuidle-am33xx cpuidle-am33xx.0: failed to register driver
[    0.207916] VFS: Disk quotas dquot_6.5.2
[    0.208007] Dquot-cache hash table entries: 1024 (order 0, 4096 bytes)
[    0.209777] msgmni has been set to 492
[    0.213928] alg: No test for stdrng (krng)
[    0.214019] io scheduler noop registered
[    0.214050] io scheduler deadline registered
[    0.214172] io scheduler cfq registered (default)
[    0.215728] omap_uart.0: ttyO0 at MMIO 0x44e09000 (irq = 72) is a OMAP UART0
[    0.849975] console [ttyO0] enabled
[    0.854553] omap_uart.1: ttyO1 at MMIO 0x48022000 (irq = 73) is a OMAP UART1
[    0.862548] omap_uart.2: ttyO2 at MMIO 0x48024000 (irq = 74) is a OMAP UART2
[    0.870544] omap_uart.3: ttyO3 at MMIO 0x481a6000 (irq = 44) is a OMAP UART3
[    0.878448] omap_uart.4: ttyO4 at MMIO 0x481a8000 (irq = 45) is a OMAP UART4
[    0.886413] omap_uart.5: ttyO5 at MMIO 0x481aa000 (irq = 46) is a OMAP UART5
[    0.906646] brd: module loaded
[    0.916473] loop: module loaded
[    0.919982] i2c-core: driver [tsl2550] using legacy suspend method
[    0.926452] i2c-core: driver [tsl2550] using legacy resume method
[    0.932891] at24 1-0050: 32768 byte 24c256 EEPROM, writable, 64 bytes/write
[    0.942687] ID EEPROM: detected.
[    0.946075] ID EEPROM: TAG not valid
[    0.950805] tps65217 1-0024: TPS65217 ID 0xf version 1.2
[    0.958648] print_constraints: DCDC1: 900 <--> 1800 mV at 1800 mV 
[    0.967407] print_constraints: DCDC2: 900 <--> 3300 mV at 1275 mV 
[    0.976165] print_constraints: DCDC3: 900 <--> 1500 mV at 1100 mV 
[    0.984863] print_constraints: LDO1: 1000 <--> 3300 mV at 1800 mV 
[    0.993591] print_constraints: LDO2: 900 <--> 3300 mV at 3300 mV 
[    1.002166] print_constraints: LDO3: 1800 <--> 3300 mV at 3300 mV 
[    1.010864] print_constraints: LDO4: 1800 <--> 3300 mV at 3300 mV 
[    1.018188] Configure GPIOs...
[    1.025451]  omap_hsmmc.0: alias fck already exists
[    1.032714] omap-gpmc omap-gpmc: GPMC revision 6.0
[    1.037780] Registering NAND on CS0
[    1.043609] at24 1-0051: 32768 byte 24c256 EEPROM, writable, 64 bytes/write
[    1.051666] BOOT EEPROM: detected.
[    1.055267] at24 1-0053: 32768 byte 24c256 EEPROM, writable, 64 bytes/write
[    1.113159] PLC EEPROM: read fail(-110)!
[    1.117309] at24 1-0054: 32768 byte 24c256 EEPROM, writable, 64 bytes/write
[    1.126983] CPL EEPROM: detected.
[    1.130432] CPL EEPROM: TAG not valid
[    1.137603] m25p80 spi1.0: w25q128 (16384 Kbytes)
[    1.142822] Creating 10 MTD partitions on "spi_flash":
[    1.148254] 0x000000000000-0x000000080000 : "SPL/MLO(Golden,RO)"
[    1.156524] 0x000000080000-0x000000100000 : "U-Boot (Golden,RO)"
[    1.164642] 0x000000100000-0x000000500000 : "Kernel (Golden,RO)"
[    1.172576] 0x000000500000-0x000000580000 : "U-Boot (Bank-A)"
[    1.180297] 0x000000580000-0x000000600000 : "U-Boot (Bank-B)"
[    1.187988] 0x000000600000-0x000000680000 : "U-Boot Env (Bank-A)"
[    1.196014] 0x000000680000-0x000000700000 : "U-Boot Env (Bank-B)"
[    1.204040] 0x000000700000-0x000000b00000 : "Kernel (Bank-A)"
[    1.211700] 0x000000b00000-0x000000f00000 : "Kernel (Bank-B)"
[    1.219482] 0x000000f00000-0x000001000000 : "App Data"
[    1.227294] omap2-nand driver initializing
[    1.231872] nand_get_flash_type: second ID read did not match 90,d5 against 56,00
[    1.239715] No NAND device found
[    1.243255] nand_get_flash_type: second ID read did not match 90,d5 against 56,00
[    1.251068] No NAND device found
[    1.254669] OneNAND driver initializing
[    1.262237] CAN device driver interface
[    1.266265] CAN bus driver for Bosch D_CAN controller 1.0
[    1.313201] davinci_mdio davinci_mdio.0: davinci mdio revision 1.6
[    1.319671] davinci_mdio davinci_mdio.0: detected phy mask fffffffc
[    1.327758] davinci_mdio.0: probed
[    1.331298] davinci_mdio davinci_mdio.0: phy[0]: device 0:00, driver Broadcom BCM5241
[    1.339508] davinci_mdio davinci_mdio.0: phy[1]: device 0:01, driver Broadcom BCM5241
[    1.348083] usbcore: registered new interface driver zd1201
[    1.353912] Initializing USB Mass Storage driver...
[    1.359313] usbcore: registered new interface driver usb-storage
[    1.365600] USB Mass Storage support registered.
[    1.370635]  gadget: Mass Storage Function, version: 2009/09/11
[    1.376831]  gadget: Number of LUNs=1
[    1.380645]  lun0: LUN: removable file: (no medium)
[    1.385772]  gadget: Mass Storage Gadget, version: 2009/09/11
[    1.391784]  gadget: userspace failed to provide iSerialNumber
[    1.397857]  gadget: g_mass_storage ready
[    1.402069] musb-hdrc musb-hdrc.0: MUSB HDRC host driver
[    1.407684] musb-hdrc musb-hdrc.0: new USB bus registered, assigned bus number 2
[    1.415557] usb usb2: New USB device found, idVendor=1d6b, idProduct=0002
[    1.422637] usb usb2: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[    1.430175] usb usb2: Product: MUSB HDRC host driver
[    1.435363] usb usb2: Manufacturer: Linux 3.2.0 musb-hcd
[    1.440887] usb usb2: SerialNumber: musb-hdrc.0
[    1.446777] hub 2-0:1.0: USB hub found
[    1.450744] hub 2-0:1.0: 1 port detected
[    1.456420] mousedev: PS/2 mouse device common for all mice
[    1.465026] rtc-ds1307 1-0068: rtc core: registered ds1307 as rtc0
[    1.471466] rtc-ds1307 1-0068: 56 bytes nvram
[    1.476257] i2c /dev entries driver
[    1.482421] OMAP Watchdog Timer Rev 0x01: initial timeout 60 sec
[    1.568817] omap_sham_mod_init: loading omap-sham driver
[    1.574401] omap_sham_mod_init: Unsupported cpu
[    1.579132] omap_aes_mod_init: loading omap-aes driver
[    1.584503] omap_aes_mod_init: Unsupported cpu
[    1.592498] usbcore: registered new interface driver usbhid
[    1.598358] usbhid: USB HID core driver
[    1.602355] oprofile: hardware counters not available
[    1.607635] oprofile: using timer interrupt.
[    1.612274] Netfilter messages via NETLINK v0.30.
[    1.617340] nf_conntrack version 0.5.0 (3936 buckets, 15744 max)
[    1.623931] ctnetlink v0.93: registering with nfnetlink.
[    1.629730] ip_tables: (C) 2000-2006 Netfilter Core Team
[    1.635437] TCP cubic registered
[    1.638793] Initializing XFRM netlink socket
[    1.643463] NET: Registered protocol family 10
[    1.649017] Mobile IPv6
[    1.651611] ip6_tables: (C) 2000-2006 Netfilter Core Team
[    1.657592] IPv6 over IPv4 tunneling driver
[    1.664154] NET: Registered protocol family 17
[    1.668823] can: controller area network core (rev 20090105 abi 8)
[    1.675476] NET: Registered protocol family 29
[    1.680114] can: raw protocol (rev 20090105)
[    1.684600] can: broadcast manager protocol (rev 20090105 t)
[    1.690551] Registering the dns_resolver key type
[    1.695556] VFP support v0.3: implementor 41 architecture 3 part 30 variant c rev 3
[    1.703552] ThumbEE CPU extension supported.
[    1.708068] mux: Failed to setup hwmod io irq -22
[    1.713928] Power Management for AM33XX family
[    1.718841] Trying to load am335x-pm-firmware.bin (60 secs timeout)
[    1.725524] Copied the M3 firmware to UMEM
[    1.729858] Unable to read CM3 firmware version
[    1.738891] clock: disabling unused clocks to save power
[    1.750457] Detected MACID=c4:ed:ba:8a:59:77
[    1.758239] rtc-ds1307 1-0068: setting system clock to 2000-01-01 00:01:21 UTC (946684881)
[    1.771179] net eth0: CPSW phy found : id is : 0x143bc31
[    1.778808] net eth0: CPSW phy found : id is : 0x143bc31
[    1.793121] ADDRCONF(NETDEV_UP): eth0: link is not ready
[    3.764404] PHY: 0:01 - Link is Up - 0/Half
[    3.773864] ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready
[    3.784179] PHY: 0:01 - Link is Down
[    3.793975] Sending DHCP requests .
[    4.784454] PHY: 0:01 - Link is Up - 100/Full
[    6.453826] ., OK
[    6.474273] IP-Config: Got DHCP answer from 192.168.6.168, my address is 192.168.6.204
[    6.482757] IP-Config: Complete:
[    6.486145]      device=eth0, addr=192.168.6.204, mask=255.255.255.0, gw=192.168.6.1,
[    6.494079]      host=192.168.6.204, domain=sgsrv01.sensegrid.cn, nis-domain=(none),
[    6.502166]      bootserver=192.168.6.168, rootserver=192.168.6.163, rootpath=
[    6.510345] Waiting 3sec before mounting root device...
[    9.549377] VFS: Mounted root (nfs filesystem) on device 0:15.
[    9.556274] devtmpfs: mounted
[    9.559814] Freeing init memory: 244K
[    9.816284] systemd[1]: systemd 37 running in system mode. (+PAM +LIBWRAP -AUDIT -SELINUX +SYSVINIT -LIBCRYPTSETUP; angstrom)

Welcome to The 脜ngstr枚m Distribution!

[    9.856323] systemd[1]: Set hostname to <MPU-001>.
Starting Runtime Directory...
Starting Media Directory...
Starting Remount API VFS...
Starting Lock Directory...
Starting Debug File System...
Starting Security File System...
Started Apply Kernel Variables                                          [  OK  ]
Starting POSIX Message Queue File System...
Started Load Kernel Modules                                             [  OK  ]
Started Configuration File System                                       [  OK  ]
Started FUSE Control File System                                        [  OK  ]
Started Set Up Additional Binary Formats                                [  OK  ]
Started Huge Pages File System                                          [  OK  ]
Starting File System Check on Root Device...
Starting udev Coldplug all Devices...
Starting udev Kernel Device Manager...
Starting Syslog Kernel Log Buffer Bridge...
Started Syslog Kernel Log Buffer Bridge                                 [  OK  ]
Started Runtime Directory                                               [  OK  ]
Started Media Directory                                                 [  OK  ]
Started Remount API VFS                                                 [  OK  ]
[   10.714660] udevd[627]: starting version 175
Started udev Kernel Device Manager                                      [  OK  ]
Started Lock Directory                                                  [  OK  ]
Started Debug File System                                               [  OK  ]
Started Security File System                                            [  OK  ]
Started POSIX Message Queue File System                                 [  OK  ]
Started File System Check on Root Device                                [  OK  ]
Starting Remount Root FS...
Starting STDOUT Syslog Bridge...
Started STDOUT Syslog Bridge                                            [  OK  ]
Started Remount Root FS                                                 [  OK  ]
Started Opkg first boot configure                                       [  OK  ]
Starting /tmp...
Started Machine ID first boot configure                                 [  OK  ]
Started /tmp                                                            [  OK  ]
Starting Recreate Volatile Files and Directories...
Starting Load Random Seed...
Started Load Random Seed                                                [  OK  ]
Started Recreate Volatile Files and Directories                         [  OK  ]
Starting System Logging Service...
Started SSH Key Generation                                              [  OK  ]
Starting D-Bus System Message Bus...
Starting Permit User Sessions...
Starting Login Service...
Starting Avahi mDNS/DNS-SD Stack...
Stopping Syslog Kernel Log Buffer Bridge...
Stopped Syslog Kernel Log Buffer Bridge                                 [  OK  ]
Started System Logging Service                                          [  OK  ]
Started Permit User Sessions                                            [  OK  ]
Started D-Bus System Message Bus                                        [  OK  ]
Started Avahi mDNS/DNS-SD Stack                                         [  OK  ]
Started Login Service                                                   [  OK  ]
Started udev Coldplug all Devices                                       [  OK  ]
Starting Boot Status Update Daemon...
Started Boot Status Update Daemon                                       [  OK  ]
Starting Watchdog Timer Daemon...
Starting Telnetd Daemon...
Started Telnetd Daemon                                                  [  OK  ]
Started Watchdog Timer Daemon                                           [  OK  ]
Starting App...
Failed to start App                                                     [FAILED]
See 'systemctl status app.service' for details.
Starting Serial Getty on ttyO0...
Started Serial Getty on ttyO0                                           [  OK  ]

.---O---.                                           
|       |                  .-.           o o        
|   |   |-----.-----.-----.| |   .----..-----.-----.
|       |     | __  |  ---'| '--.|  .-'|     |     |
|   |   |  |  |     |---  ||  --'|  |  |  '  | | | |
'---'---'--'--'--.  |-----''----''--'  '-----'-'-'-'
                -'  |
                '---'

The Angstrom Distribution MPU-001 ttyO0

Angstrom v2012.01-core - Kernel 3.2.0

MPU-001 login: root
Password: 
Last login: Sat Jan  1 08:00:43 HKT 2000 on ttyO0
root@MPU-001:~# cat /proc/mtd 
dev:    size   erasesize  name
mtd0: 00080000 00001000 "SPL/MLO(Golden,RO)"
mtd1: 00080000 00001000 "U-Boot (Golden,RO)"
mtd2: 00400000 00001000 "Kernel (Golden,RO)"
mtd3: 00080000 00001000 "U-Boot (Bank-A)"
mtd4: 00080000 00001000 "U-Boot (Bank-B)"
mtd5: 00080000 00001000 "U-Boot Env (Bank-A)"
mtd6: 00080000 00001000 "U-Boot Env (Bank-B)"
mtd7: 00400000 00001000 "Kernel (Bank-A)"
mtd8: 00400000 00001000 "Kernel (Bank-B)"
mtd9: 00100000 00001000 "App Data"
root@MPU-001:~# 
root@MPU-001:~#