I.MX6Q学习笔记——新版BSP之根文件系统挂载

　　本文由博主girlkoo编写，关于E9与TQIMX6Q开发平台根文件系统挂载的文章。
　　经过前面的移植，新版BSP的uboot和kernel已经能够在tqimx6q开发板上运行了，接下来我们来挂载文件系统。

　　DTB整理
　　前面的文章中提到，新版BSP的DTB管理感觉不是太好，在之前移植的BSP上我发现即便有根文件系统，内核也会挂掉，由于原来的DTS文件中配置内容太多，不好确定问题的源头，本文对DTS进行了整理，整理后只需要一个DTS文件，其内容如下:

1. /*
   
2. * Copyright 2012 Freescale Semiconductor, Inc.
   
3. * Copyright 2011 Linaro Ltd.
   
4. *
   
5. * The code contained herein is licensed under the GNU General Public
   
6. * License. You may obtain a copy of the GNU General Public License
   
7. * Version 2 or later at the following locations:
   
8. *
   
9. * http://www.opensource.org/licenses/gpl-license.html
   
10. * http://www.gnu.org/copyleft/gpl.html
    
11. */  
    
12.   
    
13.   
    
14. /dts-v1/;  
    
15.   
    
16.   
    
17. #include "imx6q.dtsi"  
    
18.   
    
19.   
    
20. / {  
    
21. <span style="white-space:pre">    </span>model = "Freescale i.MX6 Quad SABRE Smart Device Board";  
    
22. <span style="white-space:pre">    </span>compatible = "fsl,imx6q-sabresd", "fsl,imx6q";  
    
23.   
    
24.   
    
25. <span style="white-space:pre">    </span>memory {  
    
26. <span style="white-space:pre">        </span>reg = <0x10000000 0x80000000>;  
    
27. <span style="white-space:pre">    </span>};  
    
28. };  
    
29.   
    
30.   
    
31. &uart1 {  
    
32. <span style="white-space:pre">    </span>pinctrl-names = "default";  
    
33. <span style="white-space:pre">    </span>pinctrl-0 = <&pinctrl_uart1_2>;  
    
34. <span style="white-space:pre">    </span>status = "okay";  
    
35. };  
    
36.   
    
37.   
    
38. &usdhc2 {  
    
39. <span style="white-space:pre">    </span>pinctrl-names = "default";  
    
40. <span style="white-space:pre">    </span>pinctrl-0 = <&pinctrl_usdhc2_2>;  
    
41. <span style="white-space:pre">    </span>cd-gpios = <&gpio1 4 0>;  
    
42. <span style="white-space:pre">    </span>wp-gpios = <&gpio1 2 0>;  
    
43. <span style="white-space:pre">    </span>no-1-8-v;  
    
44. <span style="white-space:pre">    </span>keep-power-in-suspend;  
    
45. <span style="white-space:pre">    </span>enable-sdio-wakeup;  
    
46. <span style="white-space:pre">    </span>status = "okay";  
    
47. };  
    
48.   
    
49.   
    
50. &iomuxc {  
    
51. <span style="white-space:pre">    </span>pinctrl-names = "default";  
    
52.   
    
53.   
    
54. <span style="white-space:pre">    </span>uart1 {  
    
55. <span style="white-space:pre">        </span>pinctrl_uart1_2: uart1grp-2 {  
    
56. <span style="white-space:pre">            </span>fsl,pins = <  
    
57. <span style="white-space:pre">                </span>MX6QDL_PAD_SD3_DAT7__UART1_TX_DATA 0x1b0b1  
    
58. <span style="white-space:pre">                </span>MX6QDL_PAD_SD3_DAT6__UART1_RX_DATA 0x1b0b1  
    
59. <span style="white-space:pre">            </span>>;  
    
60. <span style="white-space:pre">        </span>};  
    
61. <span style="white-space:pre">    </span>};  
    
62. };  

复制代码

　　同时，需要将imx6qdl.dtsi恢复到前文改动之前的状态，因为代码是使用git管理的，因此，可以使用如下指令恢复：

1. git checkout imx6qdl.dtsi  

复制代码

　　制作启动SD卡
　　根文件系统的制作方法本文就不再赘述了，可以参考本博客S5PV210相关的记载。本人将制作好的根文件系统打包上传到网盘，如果您也懒得重新制作根文件系统可以暂时使用鄙人制作的的这个：
　　Freescale I.MX6Q BSP移植资料整理
　　下面开始制作启动SD卡：
　　Step1. 使用fdisk命令对SD卡进行分区
　　其实，移植3.0内核版本的BSP时已经使用过fdisk命令，与之前的不同是分区的起始offset改在20M的位置上，具体如下：
　　(1) 启动分区指令

　　其中sdb请根据自己的实际情况制定，执行之前一定要再三确认好，以免误操作导致文件丢失。

• sudo fdisk /dev/sdb  
  

　　(2) 切换到sector模式
　　按u然后回车，重复操作直至切换到sector模式。
　　(3) 删除既有分区
　　按d然后回车，重复操作直至删除所有分区。
　　(4) 创建新分区
　　按n创建新分区。
　　(5) 执行分区类型。
　　按p选择为主分区。
　　(6) 输入起始偏移
　　输入"+20M"，指定该分区的起始位置是20M的位置上。
　　(7) 输入结束偏移
　　本文仅使用了一个分区，故直接按回车，表示该分区的结束位置是磁盘的末尾。
　　(8) 保存分区信息
　　按w然后回车，即可保存分区信息。
　　Step2. 格式化分区

　　使用mkfs命令格式化新创建的分区，对于移动设备，可以考虑使用ext3或者ext4文件系统，指令如下:

1. sudo mkfs.ext3 /dev/sdb1  

复制代码

　　或者

1. sudo mkfs.ext4 /dev/sdb1  

复制代码

　　Step3. 拷贝根文件系统

　　由于本人之前制作好的根文件系统是个压缩包，故直接解压到该分区即可。

1. sudo mount /dev/sdb1 /mnt  
   
2. sudo tar jxf rootfs.tar.bz2 -C /mnt  
   
3. sudo mv /mnt/rootfs/* /mnt  
   
4. sudo rm /mnt/rootfs  
   
5. sudo umount /mnt  

复制代码

　　至此，就完成了根文件系统的制作。

　　配置uboot环境变量

1. setenv bootargs 'noinitrd console=ttymxc0,115200 root=/dev/mmcblk0p1 rw init=/linuxrc'  
   
2. setenv bootcmd 'mmc dev 0; mmc read 0x11ffffc0 0x800 0x3000; mmc read 0x18000000 0x5000 0x800; bootm 0x11ffffc0 - 0x18000000'  
   
3. saveenv  

复制代码

　　之后重启开发板即可。

　　效果展示

　　启动Log如下：

1. U-Boot 2013.04-04987-g98fdbdc-dirty (May 03 2015 - 11:46:24)  
   
2.   
   
3. CPU:   Freescale i.MX6Q rev1.2 at 792 MHz  
   
4. CPU:   Temperature 27 C, calibration data: 0x54e4bb69  
   
5. Reset cause: POR  
   
6. Board: MX6Q/SDL-SabreSD  
   
7. I2C:   ready  
   
8. DRAM:  1 GiB  
   
9. MMC:   FSL_SDHC: 0, FSL_SDHC: 1, FSL_SDHC: 2  
   
10. No panel detected: default to Hannstar-XGA  
    
11. Display: Hannstar-XGA (1024x768)  
    
12. In:    serial  
    
13. Out:   serial  
    
14. Err:   serial  
    
15. mmc0 is current device  
    
16. Net:   Phy not found  
    
17. PHY reset timed out  
    
18. FEC [PRIME]  
    
19. Warning: failed to set MAC address  
    
20.   
    
21. Normal Boot  
    
22. Hit any key to stop autoboot:  0   
    
23. mmc0 is current device  
    
24.   
    
25. MMC read: dev # 0, block # 2048, count 12288 ... 12288 blocks read: OK  
    
26.   
    
27. MMC read: dev # 0, block # 20480, count 2048 ... 2048 blocks read: OK  
    
28. ## Booting kernel from Legacy Image at 11ffffc0 ...  
    
29.    Image Name:   Linux-3.10.17-80739-g33597e3-dir  
    
30.    Image Type:   ARM Linux Kernel Image (uncompressed)  
    
31.    Data Size:    5289224 Bytes = 5 MiB  
    
32.    Load Address: 12000000  
    
33.    Entry Point:  12000000  
    
34.    Verifying Checksum ... OK  
    
35. ## Flattened Device Tree blob at 18000000  
    
36.    Booting using the fdt blob at 0x18000000  
    
37.    XIP Kernel Image ... OK  
    
38. OK  
    
39.    Using Device Tree in place at 18000000, end 1800befb  
    
40.   
    
41. Starting kernel ...  
    
42.   
    
43. Booting Linux on physical CPU 0x0  
    
44. Linux version 3.10.17-80739-g33597e3-dirty (lilianrong@lenovo) (gcc version 4.7.3 (Ubuntu/Linaro 4.7.3-12ubuntu1) ) #1 SMP PREEMPT Sun May 3 11:31:37 CST 2015  
    
45. CPU: ARMv7 Processor [412fc09a] revision 10 (ARMv7), cr=10c53c7d  
    
46. CPU: PIPT / VIPT nonaliasing data cache, VIPT aliasing instruction cache  
    
47. Machine: Freescale i.MX6 Quad/DualLite (Device Tree), model: Freescale i.MX6 Quad SABRE Smart Device Board  
    
48. cma: CMA: reserved 320 MiB at 3c000000  
    
49. Memory policy: ECC disabled, Data cache writealloc  
    
50. PERCPU: Embedded 8 pages/cpu @814f8000 s8896 r8192 d15680 u32768  
    
51. Built 1 zonelists in Zone order, mobility grouping on.  Total pages: 260096  
    
52. Kernel command line: noinitrd console=ttymxc0,115200 root=/dev/mmcblk0p1 rw rootfstype=ext4 init=/linuxrc  
    
53. PID hash table entries: 4096 (order: 2, 16384 bytes)  
    
54. Dentry cache hash table entries: 131072 (order: 7, 524288 bytes)  
    
55. Inode-cache hash table entries: 65536 (order: 6, 262144 bytes)  
    
56. Memory: 1024MB = 1024MB total  
    
57. Memory: 697800k/697800k available, 350776k reserved, 0K highmem  
    
58. Virtual kernel memory layout:  
    
59.     vector  : 0xffff0000 - 0xffff1000   (   4 kB)  
    
60.     fixmap  : 0xfff00000 - 0xfffe0000   ( 896 kB)  
    
61.     vmalloc : 0xc0800000 - 0xff000000   (1000 MB)  
    
62.     lowmem  : 0x80000000 - 0xc0000000   (1024 MB)  
    
63.     pkmap   : 0x7fe00000 - 0x80000000   (   2 MB)  
    
64.     modules : 0x7f000000 - 0x7fe00000   (  14 MB)  
    
65.       .text : 0x80008000 - 0x80be704c   (12157 kB)  
    
66.       .init : 0x80be8000 - 0x80c2a2c0   ( 265 kB)  
    
67.       .data : 0x80c2c000 - 0x80c7c260   ( 321 kB)  
    
68.        .bss : 0x80c7c260 - 0x80ce5434   ( 421 kB)  
    
69. SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=4, Nodes=1  
    
70. Preemptible hierarchical RCU implementation.  
    
71. NR_IRQS:16 nr_irqs:16 16  
    
72. L310 cache controller enabled  
    
73. l2x0: 16 ways, CACHE_ID 0x410000c7, AUX_CTRL 0x32070000, Cache size: 1048576 B  
    
74. sched_clock: 32 bits at 3000kHz, resolution 333ns, wraps every 1431655ms  
    
75. CPU identified as i.MX6Q, silicon rev 1.2  
    
76. Console: colour dummy device 80x30  
    
77. Calibrating delay loop... 1581.05 BogoMIPS (lpj=7905280)  
    
78. pid_max: default: 32768 minimum: 301  
    
79. Mount-cache hash table entries: 512  
    
80. CPU: Testing write buffer coherency: ok  
    
81. CPU0: thread -1, cpu 0, socket 0, mpidr 80000000  
    
82. Setting up static identity map for 0x80610608 - 0x80610660  
    
83. CPU1: Booted secondary processor  
    
84. CPU1: thread -1, cpu 1, socket 0, mpidr 80000001  
    
85. CPU2: Booted secondary processor  
    
86. CPU2: thread -1, cpu 2, socket 0, mpidr 80000002  
    
87. CPU3: Booted secondary processor  
    
88. CPU3: thread -1, cpu 3, socket 0, mpidr 80000003  
    
89. Brought up 4 CPUs  
    
90. SMP: Total of 4 processors activated (6324.22 BogoMIPS).  
    
91. CPU: All CPU(s) started in SVC mode.  
    
92. devtmpfs: initialized  
    
93. pinctrl core: initialized pinctrl subsystem  
    
94. regulator-dummy: no parameters  
    
95. NET: Registered protocol family 16  
    
96. DMA: preallocated 256 KiB pool for atomic coherent allocations  
    
97. Use WDOG1 as reset source  
    
98. syscon 20c8000.anatop: regmap [mem 0x020c8000-0x020c8fff] registered  
    
99. vdd1p1: 800 <--> 1375 mV at 1125 mV   
    
100. vdd3p0: 2800 <--> 3150 mV at 3000 mV   
     
101. vdd2p5: 2000 <--> 2750 mV at 2425 mV   
     
102. cpu: 725 <--> 1450 mV at 1150 mV   
     
103. vddpu: 725 <--> 1450 mV   
     
104. vddsoc: 725 <--> 1450 mV at 1200 mV   
     
105. syscon 20e0000.iomuxc-gpr: regmap [mem 0x020e0000-0x020e0037] registered  
     
106. syscon 21bc000.ocotp-ctrl: regmap [mem 0x021bc000-0x021bffff] registered  
     
107. hw-breakpoint: found 5 (+1 reserved) breakpoint and 1 watchpoint registers.  
     
108. hw-breakpoint: maximum watchpoint size is 4 bytes.  
     
109. imx6q-pinctrl 20e0000.iomuxc: initialized IMX pinctrl driver  
     
110. bio: create slab <bio-0> at 0  
     
111. mxs-dma 110000.dma-apbh: initialized  
     
112. i2c-core: driver [max17135] using legacy suspend method  
     
113. i2c-core: driver [max17135] using legacy resume method  
     
114. SCSI subsystem initialized  
     
115. usbcore: registered new interface driver usbfs  
     
116. usbcore: registered new interface driver hub  
     
117. usbcore: registered new device driver usb  
     
118. Linux video capture interface: v2.00  
     
119. pps_core: LinuxPPS API ver. 1 registered  
     
120. pps_core: Software ver. 5.3.6 - Copyright 2005-2007 Rodolfo Giometti <giometti@linux.it>  
     
121. PTP clock support registered  
     
122. imx-ipuv3 2400000.ipu: IPU DMFC NORMAL mode: 1(0~1), 5B(4,5), 5F(6,7)  
     
123. imx-ipuv3 2800000.ipu: IPU DMFC NORMAL mode: 1(0~1), 5B(4,5), 5F(6,7)  
     
124. MIPI CSI2 driver module loaded  
     
125. Advanced Linux Sound Architecture Driver Initialized.  
     
126. cfg80211: Calling CRDA to update world regulatory domain  
     
127. Switching to clocksource mxc_timer1  
     
128. NET: Registered protocol family 2  
     
129. TCP established hash table entries: 8192 (order: 4, 65536 bytes)  
     
130. TCP bind hash table entries: 8192 (order: 4, 65536 bytes)  
     
131. TCP: Hash tables configured (established 8192 bind 8192)  
     
132. TCP: reno registered  
     
133. UDP hash table entries: 512 (order: 2, 16384 bytes)  
     
134. UDP-Lite hash table entries: 512 (order: 2, 16384 bytes)  
     
135. NET: Registered protocol family 1  
     
136. RPC: Registered named UNIX socket transport module.  
     
137. RPC: Registered udp transport module.  
     
138. RPC: Registered tcp transport module.  
     
139. RPC: Registered tcp NFSv4.1 backchannel transport module.  
     
140. hw perfevents: enabled with ARMv7 Cortex-A9 PMU driver, 7 counters available  
     
141. pureg-dummy: no parameters  
     
142. imx6_busfreq busfreq.15: DDR medium rate not supported.  
     
143. Bus freq driver module loaded  
     
144. VFS: Disk quotas dquot_6.5.2  
     
145. Dquot-cache hash table entries: 1024 (order 0, 4096 bytes)  
     
146. NFS: Registering the id_resolver key type  
     
147. Key type id_resolver registered  
     
148. Key type id_legacy registered  
     
149. jffs2: version 2.2. (NAND) 漏 2001-2006 Red Hat, Inc.  
     
150. fuse init (API version 7.22)  
     
151. msgmni has been set to 2002  
     
152. io scheduler noop registered  
     
153. io scheduler deadline registered  
     
154. io scheduler cfq registered (default)  
     
155. imx-weim 21b8000.weim: WEIM driver registered.  
     
156. MIPI DSI driver module loaded  
     
157. imx-sdma 20ec000.sdma: no iram assigned, using external mem  
     
158. imx-sdma 20ec000.sdma: loaded firmware 1.1  
     
159. imx-sdma 20ec000.sdma: initialized  
     
160. Serial: IMX driver  
     
161. 2020000.serial: ttymxc0 at MMIO 0x2020000 (irq = 58) is a IMX  
     
162. console [ttymxc0] enabled  
     
163. serial: Freescale lpuart driver  
     
164. [drm] Initialized drm 1.1.0 20060810  
     
165. [drm] Initialized vivante 1.0.0 20120216 on minor 0  
     
166. brd: module loaded  
     
167. loop: module loaded  
     
168. CAN device driver interface  
     
169. ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver  
     
170. usbcore: registered new interface driver usb-storage  
     
171. mousedev: PS/2 mouse device common for all mice  
     
172. i2c-core: driver [isl29023] using legacy suspend method  
     
173. i2c-core: driver [isl29023] using legacy resume method  
     
174. snvs_rtc 20cc034.snvs-rtc-lp: rtc core: registered 20cc034.snvs-rtc-lp as rtc0  
     
175. i2c /dev entries driver  
     
176. i2c-core: driver [mag3110] using legacy suspend method  
     
177. i2c-core: driver [mag3110] using legacy resume method  
     
178. imx2-wdt 20bc000.wdog: IMX2+ Watchdog Timer enabled. timeout=60s (nowayout=0)  
     
179. cpuidle: using governor ladder  
     
180. cpuidle: using governor menu  
     
181. sdhci: Secure Digital Host Controller Interface driver  
     
182. sdhci: Copyright(c) Pierre Ossman  
     
183. sdhci-pltfm: SDHCI platform and OF driver helper  
     
184. mmc0: no vqmmc regulator found  
     
185. mmc0: no vmmc regulator found  
     
186. mmc0: SDHCI controller on 2194000.usdhc [2194000.usdhc] using ADMA  
     
187. mmc0: host does not support reading read-only switch. assuming write-enable.  
     
188. mmc0: new high speed SDHC card at address e624  
     
189. mmcblk0: mmc0:e624 SS08G 7.40 GiB   
     
190. mmcblk0: p1  
     
191. Galcore version 4.6.9.9754  
     
192. mxc_vdoa 21e4000.vdoa: i.MX Video Data Order Adapter(VDOA) driver probed  
     
193. mxc_asrc 2034000.asrc: mxc_asrc registered  
     
194. mxc_vpu 2040000.vpu: VPU initialized  
     
195. caam 2100000.caam: device ID = 0x0a16010000000000 (Era -524)  
     
196. caam 2100000.caam: job rings = 2, qi = 0  
     
197. caam 2100000.caam: authenc-hmac-md5-cbc-aes-caam  
     
198. caam 2100000.caam: authencesn-hmac-md5-cbc-aes-caam  
     
199. caam 2100000.caam: authenc-hmac-sha1-cbc-aes-caam  
     
200. caam 2100000.caam: authencesn-hmac-sha1-cbc-aes-caam  
     
201. caam 2100000.caam: authenc-hmac-sha224-cbc-aes-caam  
     
202. caam 2100000.caam: authencesn-hmac-sha224-cbc-aes-caam  
     
203. caam 2100000.caam: authenc-hmac-sha256-cbc-aes-caam  
     
204. caam 2100000.caam: authencesn-hmac-sha256-cbc-aes-caam  
     
205. caam 2100000.caam: authenc-hmac-md5-cbc-des3_ede-caam  
     
206. caam 2100000.caam: authencesn-hmac-md5-cbc-des3_ede-caam  
     
207. caam 2100000.caam: authenc-hmac-sha1-cbc-des3_ede-caam  
     
208. caam 2100000.caam: authencesn-hmac-sha1-cbc-des3_ede-caam  
     
209. caam 2100000.caam: authenc-hmac-sha224-cbc-des3_ede-caam  
     
210. caam 2100000.caam: authencesn-hmac-sha224-cbc-des3_ede-caam  
     
211. caam 2100000.caam: authenc-hmac-sha256-cbc-des3_ede-caam  
     
212. caam 2100000.caam: authencesn-hmac-sha256-cbc-des3_ede-caam  
     
213. caam 2100000.caam: authenc-hmac-md5-cbc-des-caam  
     
214. caam 2100000.caam: authencesn-hmac-md5-cbc-des-caam  
     
215. caam 2100000.caam: authenc-hmac-sha1-cbc-des-caam  
     
216. caam 2100000.caam: authencesn-hmac-sha1-cbc-des-caam  
     
217. caam 2100000.caam: authenc-hmac-sha224-cbc-des-caam  
     
218. caam 2100000.caam: authencesn-hmac-sha224-cbc-des-caam  
     
219. caam 2100000.caam: authenc-hmac-sha256-cbc-des-caam  
     
220. caam 2100000.caam: authencesn-hmac-sha256-cbc-des-caam  
     
221. caam 2100000.caam: ecb-des-caam  
     
222. caam 2100000.caam: ecb-arc4-caam  
     
223. caam 2100000.caam: ecb-aes-caam  
     
224. caam 2100000.caam: ctr-aes-caam  
     
225. caam 2100000.caam: cbc-aes-caam  
     
226. caam 2100000.caam: ecb-des3-caam  
     
227. caam 2100000.caam: cbc-3des-caam  
     
228. caam 2100000.caam: cbc-des-caam  
     
229. caam 2100000.caam: fsl,sec-v4.0 algorithms registered in /proc/crypto  
     
230. platform 2101000.jr0: registering rng-caam  
     
231. platform caam_sm: caam_sm_test: 8-byte key test match OK  
     
232. platform caam_sm: caam_sm_test: 16-byte key test match OK  
     
233. platform caam_sm: caam_sm_test: 32-byte key test match OK  
     
234. platform caam_secvio.16: security violation service handlers armed  
     
235. usbcore: registered new interface driver usbhid  
     
236. usbhid: USB HID core driver  
     
237. i2c-core: driver [cs42888] using legacy suspend method  
     
238. i2c-core: driver [cs42888] using legacy resume method  
     
239. TCP: cubic registered  
     
240. NET: Registered protocol family 10  
     
241. sit: IPv6 over IPv4 tunneling driver  
     
242. NET: Registered protocol family 17  
     
243. can: controller area network core (rev 20120528 abi 9)  
     
244. NET: Registered protocol family 29  
     
245. can: raw protocol (rev 20120528)  
     
246. can: broadcast manager protocol (rev 20120528 t)  
     
247. can: netlink gateway (rev 20130117) max_hops=1  
     
248. 8021q: 802.1Q VLAN Support v1.8  
     
249. Key type dns_resolver registered  
     
250. VFP support v0.3: implementor 41 architecture 3 part 30 variant 9 rev 4  
     
251. snvs_rtc 20cc034.snvs-rtc-lp: setting system clock to 1970-01-01 00:01:12 UTC (72)  
     
252. ALSA device list:  
     
253.   No soundcards found.  
     
254. EXT4-fs (mmcblk0p1): recovery complete  
     
255. EXT4-fs (mmcblk0p1): mounted filesystem with ordered data mode. Opts: (null)  
     
256. VFS: Mounted root (ext4 filesystem) on device 179:1.  
     
257. devtmpfs: mounted  
     
258. Freeing unused kernel memory: 264K (80be8000 - 80c2a000)  
     
259. ----------mount all..........  
     
260. ----------Starting mdev......  
     
261.   
     
262. Please press Enter to activate this console.   
     
263. @tqimx6q #  

复制代码

　　总结

　　本次移植不是很顺利，让DTS折腾了一下午，最终决定使用现在这种方式移植，不过这种方式可以更深入的学习DTS。文中有不妥之处请帮忙指出，有任何疑问可以留言讨论。