I've got a strange problem with serial output. Using Wheezy and 8 Databits, 1 Stopbit, NoFlowcontroll, NoParity (config as stated in eLinux Wiki). With 57600 Baud everything works fine but with 115200 Baud all I receive is gibberish. My RasPI is connected over a MAX232 and Prolific 2303 USB-to-Serial to the PC. I supply the different outputs and my inittab, config.txt and cmdline.txt for better understanding.
What's going wrong? I have no idea how to fix this.
RS232 Output (115200 Baud)
BDöNæ9Ãóqñ*è(:¿ÞÞPʸg~^>hÊ
HH
HóLþicMùT)ÈÚNx J
~î7óv<¯ Ey:Jb HÕB¾ ¼sõH9SB!jøB"cùBFCþ¯yø _ñæü0~HBxþCNqCg¼C¨È8.ÖSBÌðÞ@OqaßØn^ã1XþC.!
n;zÖCÖ?ãSºH ©üÖdÈ_ Qãl
ô ì ÜzTü*óHo
Ì
6B
év.b0JNLYÆÿ¿iëd0U²(kßÞb!
ú]/xscB!ï¯!BoXûÿ1ïâÖCÿ6ÌAnè*íÌC)º¿BíÞØ.C.@ÆÃwHJÂs
"YE:ñ.èFðÌCÊ÷ÞÄ
!x
H
w6@BtbHJ
̪
Ì6ì
H¾a¿bH.">îvy®;f<ßBÌ
pL¨fæHE
þ¼MBÞI
üB¬JBXh@È~n
!
P\!Þ
âPÞ
½Â]ßHóÿnHâØ]½øßØÆB5`Æ!Ö.)h=ìï(
CÌóo½B WØXÌ ¾yE!T1J"!ÞhQÌè>óa½CMÖ
|!ô%@
8ýæPë÷HÊKhÖ6
@Stm:ãCî@Æö!Dö"f½Pó}ñØî?>HÈ) 6ö]zr!!o.àVBV2½Xóañ¨¾ó@
Jö!f½Pó!!@¶C
yÐ~ÝHÄ1è?ÿyEûVOPvëÌ%qºzôßñÎòRN!ÐÎkp±Ä5ßÿ®öS ¿á½PqCúDaqp@¶VÈSXÆ?öH0CóöF=½CV9YvöJÈú({ï!
©
¾qÐ#á_þþqÄZq¾
Cßÿb/Ö
øHHCèß?ÿg
ÈJàçþ6
õMR§þ:X
W~íPï!9>
HÆJ§þ9
æ1PöqÖXæ!È5`ÎüB(Öè¾ Îü@qóàÊH\Rô_
μöªBSIHLº~sH~ÖÈsH6*RLè~ó¾e
">HHCÐÿþóFÿHløHHF[PÿÎü¾&ÌB
Hy
¬ñv¾!xÌÊK`ÎCBÁf¨f3@ר{
CÏhLH
ÞxLZA²RÊU_Þgú¸
öÃ#C8Ôö\+\!6¾%@Õj¨Ü¾
¾§¿B\¿RS _aösHB&ñSÈØùÞÃ_@©*ñÄ"²NÿyPþݶJÌ H¿ØnC.@ÆÃwjNs°C\¾Cá.ók~àOéaöü¶cLHܾB῾
¸lñw1A½NX¨RÜ¿B¥@nìúÓÞ¾ ºO1@%ºâ.k8dÃw1A½NhÈHÜ¿R@l
Ö´)@NHï!3=¨IY<q8ìmñ7HC)º¿ÁÌ@I!
ߨ³!Büý_@9HJH8§¿BC!Öónè5Î8b翾¿î@ÆÃ+HC5º¿ê1ï!ókÿ9¨þcHøJJÈHïñó>k\æÊRÖ!N9ý8¿¾
§#HÖáî`}Ë@9רqúe¦zÖ*ØS¨cºRÌ
éRÌóμ)øF-ß
C¾hÿböÌF=þg
Ö&ö]~âÖXù{
.ìë[qB
Övö¾²%JBX9!÷ÿsÌÌZ!c.èÆíC½BHB2c
M]Ê]Bïñóú§UÌ¡H)CÌàXãß!F翾Bø
ÌØñ+ßCïí6Cñó
ë2HÌØñ+ßÃ]
ç_)Jô]ÃHvñUÈÐ;Í>3xcoÑHôøk
àÂCG!k9ÌN¦)Ìuüý_ü"9Ì
ú`rüý_ü"ëàN
è
ýðß"Vÿû¿
ñÿFy
H.s
èÌN
è
ýðS.Ö"á¿Bg½]JS¾
ßî0J9Ñ
ôøé¾
¾§¿F\¿Rî¿ñ!JèØÝ
B¨@9QJôøé¾
¾§¿B\¿Rî¿áÝ಩
ýÿ¿
¿Þ~%ð
Oýoú1@ú¾û.ò3JOÖk÷
iÓ]ÿC 'zyfþ[y:ãq
8aßÌ)àè,¬b}B!)!
H¿Ð?
ÌiNJ>|H"@9
ÌûBÀóÈ>!)HÄsÀn
1HH
ifúÖkCÖrc!HD)fø
½9T~I@ýûHvÿ¼Hþ
iý!H í¾7CH
éýÊý¸
é`ÎA\98²ÌJH
=¶Hü9´B
M
MCs翲BHÄ&v]@@p!ðo-JìøãBHïûó~EsC!éÚ¶B
@
pá
BN
}!c¼áàÈ=ÜJÑÍÖ.ó+~ís§C¿O!á@9JLøaoBX_az
f
Búú@9q´LþMw°6ñSȸCù~óö²Jb!
UwHöc½H¸¿nòvÿ@9ý&SH6ÃsÃk>þ²þÖHÖ¿®B+@9ôêXã:!avÄ{Âíþßüs§C¿¹þ
Ô6g8ÏýñøgÏýñ9ªB}ü!] dúí~½F
f]ܦrÞbcØÞóÃ{:Ì@Iô1X&À*C:¿hø@I!¨
P"?EF¨^s
ü{ØH!x*ìX>÷H
'9Ôøé¾
üaüE@zç¿^C¼HáSs~çr-Ê"^!v!Yè2_k«ñCû¾Bcrê"Y½kÃ
ùS~^~X@LHqóÚ!199HÆCð È&ÖH{hø@H²c¾¿¾
î
!@H
ðÿC!@9JÎùCoHoÎÃxwâ9rø@HNHøS<c
B]ÈB9Ìc@9ÙÈû(pCø@9úHiu9xgozEí+~HH=9!HøcJhº£Mg*R=*¡Jè¸L!|cBEmkÊß÷¿ø!xá
ÉzaÊU9[~
}!HvD1@9
Êø
AB!·9HH
ѽ.
_aúL!ÁqC9Ì¿
=®
Axoú
Ök
Nýû¸J@9B¸
1øbx/
b7~ÿb
^vø¼9´R}éCH;@9
zi=²ZÈh¢
çG!)VØøéºzìéÈHXJB{HJ)ZÄ°BÖ~XhXN¨BocB1íkÈîQÌí@Îjoº`â1ßEkpn9L÷ÄJÜJY®XáÂÌþþÌ@g
Â!anß"þB!oÞhg
/etc/inittab
[…]
#Spawn a getty on Raspberry Pi serial line
T0:23:respawn:/sbin/getty -L ttyAMA0 115200 vt100
/boot/config.txt
[…]
init_uart_baud=115200
/boot/cmdline.txt
dwc_otg.lpm_enable=0 console=ttyAMA0,115200 kgdboc=ttyAMA0,115200 console=tty1 root=/dev/mmcblk0p2 rootfstype=ext4 elevator=deadline rootwait
RS232 Output (57600 Baud)
[ 0.000000] Initializing cgroup subsys cpu
[ 0.000000] Linux version 3.2.27+ (dc4@dc4-arm-01) (gcc version 4.7.2 20120731 (prerelease) (crosstool-NG linaro-1.13.1+bzr2458 - Linaro GCC 2012.08) ) #160 PREEMPT Mon Sep 17 23:18:42 BST 2012
[ 0.000000] CPU: ARMv6-compatible processor [410fb767] revision 7 (ARMv7), cr=00c5387d
[ 0.000000] CPU: PIPT / VIPT nonaliasing data cache, VIPT nonaliasing instruction cache
[ 0.000000] Machine: BCM2708
[ 0.000000] Memory policy: ECC disabled, Data cache writeback
[ 0.000000] Built 1 zonelists in Zone order, mobility grouping on. Total pages: 60960
[ 0.000000] Kernel command line: dma.dmachans=0x7f35 bcm2708_fb.fbwidth=656 bcm2708_fb.fbheight=512 bcm2708.boardrev=0x5 bcm2708.serial=0xda366958 smsc95xx.macaddr=B8:27:EB:36:69:58 dwc_otg.lpm_enable=0 console=ttyAMA0,57600 kgdboc=ttyAMA0,57600 console=tty1 root=/dev/mmcblk0p2 rootfstype=ext4 elevator=deadline rootwait
[ 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] Memory: 240MB = 240MB total
[ 0.000000] Memory: 237748k/237748k available, 8012k 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 : 0xcf800000 - 0xe8000000 ( 392 MB)
[ 0.000000] lowmem : 0xc0000000 - 0xcf000000 ( 240 MB)
[ 0.000000] modules : 0xbf000000 - 0xc0000000 ( 16 MB)
[ 0.000000] .text : 0xc0008000 - 0xc04c1ec8 (4840 kB)
[ 0.000000] .init : 0xc04c2000 - 0xc04e1930 ( 127 kB)
[ 0.000000] .data : 0xc04e2000 - 0xc050dba0 ( 175 kB)
[ 0.000000] .bss : 0xc050dbc4 - 0xc05b4ae8 ( 668 kB)
[ 0.000000] NR_IRQS:330
[ 0.000000] sched_clock: 32 bits at 1000kHz, resolution 1000ns, wraps every 4294967ms
[ 0.000000] timer_set_mode: unhandled mode:1
[ 0.000000] timer_set_mode: unhandled mode:3
[ 0.000000] Console: colour dummy device 80x30
[ 0.000000] console [tty1] enabled
[ 0.000937] Calibrating delay loop... 697.95 BogoMIPS (lpj=3489792)
[ 0.060155] pid_max: default: 32768 minimum: 301
[ 0.060632] Mount-cache hash table entries: 512
[ 0.061120] Initializing cgroup subsys cpuacct
[ 0.061213] Initializing cgroup subsys devices
[ 0.061249] Initializing cgroup subsys freezer
[ 0.061280] Initializing cgroup subsys blkio
[ 0.061421] CPU: Testing write buffer coherency: ok
[ 0.061769] hw perfevents: enabled with v6 PMU driver, 3 counters available
[ 0.062981] devtmpfs: initialized
[ 0.073166] NET: Registered protocol family 16
[ 0.074848] vc_mem_connected_init: called
[ 0.074932] bcm2708_vcio: bcm_mailbox_property failed (-19)
[ 0.074976] vc_mem_update: success=-19 resp 0, vcbase=0 vcsize=0 armbase=0 armsize=0
[ 0.075021] vc-mem: mm_vc_mem_phys_addr = 0x00000000
[ 0.075052] vc-mem: mm_vc_mem_size = 0x00000000 (0 MiB)
[ 0.075532] hw-breakpoint: found 6 breakpoint and 1 watchpoint registers.
[ 0.075588] hw-breakpoint: maximum watchpoint size is 4 bytes.
[ 0.075626] mailbox: Broadcom VideoCore Mailbox driver
[ 0.075719] bcm2708_vcio: mailbox at f200b880
[ 0.075811] bcm_power: Broadcom power driver
[ 0.075850] bcm_power_open() -> 0
[ 0.075876] bcm_power_request(0, 8)
[ 0.576558] bcm_mailbox_read -> 00000080, 0
[ 0.576598] bcm_power_request -> 0
[ 0.576624] Serial: AMBA PL011 UART driver
[ 0.576777] dev:f1: ttyAMA0 at MMIO 0x20201000 (irq = 83) is a PL011 rev3
[ 1.228115] console [ttyAMA0] enabled
[ 1.256566] bio: create slab <bio-0> at 0
[ 1.265798] SCSI subsystem initialized
[ 1.273510] usbcore: registered new interface driver usbfs
[ 1.284707] usbcore: registered new interface driver hub
[ 1.295632] usbcore: registered new device driver usb
[ 1.306668] Switching to clocksource stc
[ 1.314827] FS-Cache: Loaded
[ 1.320939] CacheFiles: Loaded
[ 1.340222] NET: Registered protocol family 2
[ 1.349474] IP route cache hash table entries: 2048 (order: 1, 8192 bytes)
[ 1.364399] TCP established hash table entries: 8192 (order: 4, 65536 bytes)
[ 1.378932] TCP bind hash table entries: 8192 (order: 3, 32768 bytes)
[ 1.392039] TCP: Hash tables configured (established 8192 bind 8192)
[ 1.404779] TCP reno registered
[ 1.411067] UDP hash table entries: 256 (order: 0, 4096 bytes)
[ 1.422788] UDP-Lite hash table entries: 256 (order: 0, 4096 bytes)
[ 1.435841] NET: Registered protocol family 1
[ 1.445363] RPC: Registered named UNIX socket transport module.
[ 1.457390] RPC: Registered udp transport module.
[ 1.466832] RPC: Registered tcp transport module.
[ 1.476263] RPC: Registered tcp NFSv4.1 backchannel transport module.
[ 1.489427] bcm2708_dma: DMA manager at cf808000
[ 1.498807] bcm2708_gpio: bcm2708_gpio_probe c04e9c18
[ 1.509395] vc-mem: Videocore memory driver
[ 1.518581] audit: initializing netlink socket (disabled)
[ 1.529502] type=2000 audit(0.850:1): initialized
[ 1.651482] VFS: Disk quotas dquot_6.5.2
[ 1.659640] Dquot-cache hash table entries: 1024 (order 0, 4096 bytes)
[ 1.673659] FS-Cache: Netfs 'nfs' registered for caching
[ 1.685304] msgmni has been set to 464
[ 1.694937] io scheduler noop registered
[ 1.702801] io scheduler deadline registered (default)
[ 1.713321] io scheduler cfq registered
[ 1.738254] Console: switching to colour frame buffer device 82x32
[ 1.755657] kgdb: Registered I/O driver kgdboc.
[ 1.774083] brd: module loaded
[ 1.787933] loop: module loaded
[ 1.797789] vcos: [1]: vchiq_init_state: slot_zero = 0xffd80000, is_master = 0
[ 1.815288] vcos: [1]: vchiq_init_state: called
[ 1.827971] vcos: [1]: vchiq: initialised - version 2 (min 2), device 252.0
[ 1.845352] usbcore: registered new interface driver smsc95xx
[ 1.859615] cdc_ncm: 04-Aug-2011
[ 1.868877] usbcore: registered new interface driver cdc_ncm
[ 1.882861] dwc_otg: version 3.00a 10-AUG-2012 (platform bus)
[ 2.097242] Core Release: 2.80a
[ 2.106296] Setting default values for core params
[ 2.118759] Finished setting default values for core params
[ 2.332821] Using Buffer DMA mode
[ 2.342162] Periodic Transfer Interrupt Enhancement - disabled
[ 2.356630] Multiprocessor Interrupt Enhancement - disabled
[ 2.370569] OTG VER PARAM: 0, OTG VER FLAG: 0
[ 2.382055] Dedicated Tx FIFOs mode
[ 2.392064] dwc_otg bcm2708_usb: DWC OTG Controller
[ 2.404687] dwc_otg bcm2708_usb: new USB bus registered, assigned bus number 1
[ 2.422019] dwc_otg bcm2708_usb: irq 32, io mem 0x00000000
[ 2.435786] Init: Port Power? op_state=1
[ 2.446341] Init: Power Port (0)
[ 2.455582] usb usb1: New USB device found, idVendor=1d6b, idProduct=0002
[ 2.471968] usb usb1: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[ 2.489230] usb usb1: Product: DWC OTG Controller
[ 2.501427] usb usb1: Manufacturer: Linux 3.2.27+ dwc_otg_hcd
[ 2.515809] usb usb1: SerialNumber: bcm2708_usb
[ 2.528506] hub 1-0:1.0: USB hub found
[ 2.538882] hub 1-0:1.0: 1 port detected
[ 2.550551] usbcore: registered new interface driver uas
[ 2.564001] Initializing USB Mass Storage driver...
[ 2.576777] usbcore: registered new interface driver usb-storage
[ 2.591536] USB Mass Storage support registered.
[ 2.603758] usbcore: registered new interface driver libusual
[ 2.618392] mousedev: PS/2 mouse device common for all mice
[ 2.633165] bcm2835-cpufreq: min=700000 max=700000 cur=700000
[ 2.644723] bcm2835-cpufreq: switching to governor powersave
[ 2.658801] bcm2835-cpufreq: switching to governor powersave
[ 2.672940] cpuidle: using governor ladder
[ 2.686525] cpuidle: using governor menu
[ 2.697029] sdhci: Secure Digital Host Controller Interface driver
[ 2.711972] sdhci: Copyright(c) Pierre Ossman
[ 2.723533] sdhci: Enable low-latency mode
[ 2.734310] bcm_power_open() -> 1
[ 2.744784] Indeed it is in host mode hprt0 = 00021501
[ 2.759246] mmc0: SDHCI controller on BCM2708_Arasan [platform] using platform's DMA
[ 2.795692] mmc0: BCM2708 SDHC host at 0x20300000 DMA 2 IRQ 77
[ 2.827088] sdhci-pltfm: SDHCI platform and OF driver helper
[ 2.865457] usbcore: registered new interface driver usbhid
[ 2.892131] usbhid: USB HID core driver
[ 2.906418] mmc0: new high speed SDHC card at address b368
[ 2.930275] TCP cubic registered
[ 2.940164] mmcblk0: mmc0:b368 F0F0F 15.0 GiB
[ 2.951803] Initializing XFRM netlink socket
[ 2.964098] NET: Registered protocol family 17
[ 2.975860] Registering the dns_resolver key type
[ 2.988381] mmcblk0: p1 p2
[ 2.996776] VFP support v0.3: implementor 41 architecture 1 part 20 variant b rev 5
[ 3.019120] registered taskstats version 1
[ 3.030188] drivers/rtc/hctosys.c: unable to open rtc device (rtc0)
[ 3.045560] usb 1-1: new high-speed USB device number 2 using dwc_otg
[ 3.062356] Indeed it is in host mode hprt0 = 00001101
[ 3.122999] EXT4-fs (mmcblk0p2): mounted filesystem with ordered data mode. Opts: (null)
[ 3.164651] VFS: Mounted root (ext4 filesystem) on device 179:2.
[ 3.203562] devtmpfs: mounted
[ 3.213409] Freeing init memory: 124K
[ 3.324982] usb 1-1: New USB device found, idVendor=0424, idProduct=9512
[ 3.342402] usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
[ 3.361747] hub 1-1:1.0: USB hub found
[ 3.372518] hub 1-1:1.0: 3 ports detected
[ 3.664851] usb 1-1.1: new high-speed USB device number 3 using dwc_otg
[ 3.795227] usb 1-1.1: New USB device found, idVendor=0424, idProduct=ec00
[ 3.795250] usb 1-1.1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
[ 3.798370] smsc95xx v1.0.4
[ 3.890164] smsc95xx 1-1.1:1.0: eth0: register 'smsc95xx' at usb-bcm2708_usb-1.1, smsc95xx USB 2.0 Ethernet, b8:27:eb:36:69:58
[ 4.705538] udevd[137]: starting version 175
[ 11.566227] EXT4-fs (mmcblk0p2): re-mounted. Opts: (null)
[ 12.023872] EXT4-fs (mmcblk0p2): re-mounted. Opts: (null)
[ 12.753712] bcm2835 ALSA card created!
þþ
Debian GNU/Linux wheezy/sid raspberrypi ttyAMA0
raspberrypi login:
/etc/inittab
[…]
#Spawn a getty on Raspberry Pi serial line
T0:23:respawn:/sbin/getty -L ttyAMA0 57600 vt100
/boot/config.txt
[…]
init_uart_baud=57600
/boot/cmdline.txt
dwc_otg.lpm_enable=0 console=ttyAMA0,57600 kgdboc=ttyAMA0,57600 console=tty1 root=/dev/mmcblk0p2 rootfstype=ext4 elevator=deadline rootwait
