IC693MDL916
一旦內(nèi)核開(kāi)始執(zhí)行,它將通過(guò)驅(qū)動(dòng)程序初始化所有硬件,這可以從我們的 pc 機(jī)監(jiān)視器的輸出看出來(lái),每個(gè)驅(qū)動(dòng)程序都打印一些有關(guān)它的信息。初始化完成后,計(jì)算機(jī)就準(zhǔn)備運(yùn)行嵌入式應(yīng)用。也許一個(gè),也許是多個(gè)應(yīng)用程序組成了嵌入式應(yīng)用,但通常首先調(diào)用的是 init(通過(guò) loader 向核心傳入init=/program 可以定制首先運(yùn)行的程序)。桌面 linux 中,init 會(huì)讀取/etc/inittab 文件,來(lái)決定執(zhí)行級(jí)別和哪些腳本和命令。嵌入式應(yīng)用中,可以根據(jù)實(shí)際的情況決定是否使用標(biāo)準(zhǔn)的 init 執(zhí)行方式,也許這個(gè) init 是個(gè)靜態(tài)程序,它能夠完成我們的嵌入應(yīng)用的特定任務(wù),那完全不用考慮 inittab 了。
initrd 文件系統(tǒng),initrd 以一種把內(nèi)核從存儲(chǔ)介質(zhì)裝入到內(nèi)存的相同的機(jī)制來(lái)裝入一個(gè)小型文件系統(tǒng)。這個(gè)文件系統(tǒng)最好是以壓縮的方式存儲(chǔ)在介質(zhì)上的,解壓縮到 RAM 盤(pán)上。通過(guò)使用 initrd,包含有核心驅(qū)動(dòng)和啟動(dòng)腳本的小文件系統(tǒng),就可以直接從介質(zhì)上和內(nèi)核一起啟動(dòng)起來(lái),內(nèi)核屆壓縮這個(gè)文件系統(tǒng),并執(zhí)行這個(gè)文件系統(tǒng)上叫做/linuxrc 的腳本文件,這個(gè)腳本通常會(huì)把啟動(dòng)過(guò)程中所需要的驅(qū)動(dòng)程序裝入。腳本退出以后,initrd 文件系統(tǒng)也卸下了,啟動(dòng)過(guò)程進(jìn)入真正初始化過(guò)程。對(duì)于嵌入式來(lái)講,可以將需要的應(yīng)用軟件都運(yùn)行在這個(gè)initrd 文件系統(tǒng)上,只要/linxrc 文件不結(jié)束,內(nèi)核啟動(dòng)過(guò)程的其他部分就不會(huì)繼續(xù)。
IC693MDL916
IC693MDL916聯(lián)系人:李先生
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IC693MDL916
ABB DSQC大特賣(mài):0592-5361112 15359273791 小劉
DSQC 223 YB 560 103-BD
DSQC 223Digital I/O Boar
DSQC 224Combi I/O Board
DSQC 227Winchester Interface Board
DSQC 228Safety Board
DSQC 230Robot Computer Board
DSQC 233 YB 560 103-BS S3 External axis board
DSQC 233External Axis Board
DSQC 235ARectifier Unit
DSQC 235BServo Rectifier IRB 6000
DSQC 236AServo Drive Unit
DSQC 236BServo Drive Unit
DSQC 236C Servo Drive unit
DSQC 236D 3HAB 2207-1 S4 Servo power unit (3 axis)
DSQC 236D Servo power unit (3 axis) suitable for: IRB 2000
DSQC 236GServo Drive Unit
DSQC 236H Servo Power Unit suitable for: IRB 2400 S4 M96
DSQC 236K Servo Power Unit suitable for: IRB 2400 S4 M96
DSQC 236P 3HAA 3563-AJA S3 Servo power unit (3 axis)
DSQC 236P Servo Drive Unit (3 Axis)
DSQC 236T Servo Drive Unit
DSQC 238 Resolver Filter Board
DSQC 239 YB 560 103-CH S3 Remote I/O (RIO)
DSQC 239 Remote I/O (RIO)
DSQC 241 POWER SUPPLY
DSQC 243 3HAA 0001-CP S3 SMB
DSQC 248 3HAA 3563-AAA S3 Teach pendant board
DSQC 252 3HAA 3563-ALA S3 Safety board
DSQC 253 Serial Measurement Board SMB Model: 3HAA 3563-AMA
DSQC 254 3HAA 3563-APA S3 Computer Backplane
DSQC 256A 3HAB 2211-1 S3/S4 System board
DSQC 258 3HAA 3563-AUA S3&S4 Power supply
DSQC 259 3HAB 2205-1 S4 Noise Eliminator Board
DSQC 266C Servo Power Board suitable for: IRB 2000 (Axis 2,7) IR
DSQC 266H Servo Drive Unit
DSQC 266T Servo Drive Unit suitable for: IRB 6000 (Axis 1,2,3,7)
DSQC 301 3HAA 3573-ABA S4 Programmable unit board
DSQC 313 3HAB 2213-1/3 S4 SMB
DSQC 314A
DSQC 314B DSQC 314B Rectifier Unit also called a DC Link DSQC 31
DSQC 324 3HAB 5957-1/3 S4C Memory Board 16Mb
DSQC 326 3HAB 2242-1 S4 Robot Computer
DSQC 327 3HAC17971-1 S4C & S4C Plus
DSQC 328 3HAC 17970-1 S4C Digital I/O Unit
DSQC 332 3HAB9669-1 S4C Relay I/O Unit 16...
DSCQ 336 3HNE 00001/07 S4C Ethernet Communication...
DSQC 344 3HAB 7686-1/013 S4C Interbus S Interface Board
DSQC 351 Interbus-S slave unit
DSQC 652 3HAC025917-001/00 IRC5 Digital Input Output Bd
QHNM 302 S1 Interrupt & power fail board
S4 Teach Pendant Screen TPU1
SIEMENS DSQC 249A
YB 161 100-DP S2 Teach pendant 6m cable
YB560 100-BBA S3 Teach Pendant 10 m cable
YB560 100-EA S3 Teach Pendant 10 m cable 19 way plug
YTE 102A
YTE 102A Servo Drive Unit YT213 001 AA
YTE 102B Servo Drive Unit (fused type) YT213 001 BB
YTE 102B Servo Drive Unit YT213 001 AB
YTE 102C Servo Drive Unit
YTEA 250-8 YT 212 001-AE S2 Servo power board
YYT 102B ASEA (CIRCUIT BOARD)
YYT 102C YT 213 001-BC/2 S2 Servo control board