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:/*
* Copyright 2012 Freescale Semiconductor, Inc.
* Copyright 2011 Linaro Ltd.
*
* The code contained herein is licensed under the GNU General Public
* License. You may obtain a copy of the GNU General Public License
* Version 2 or later at the following locations:
*
* http://www.opensource.org/licenses/gpl-license.html
* http://www.gnu.org/copyleft/gpl.html
*/
/dts-v1/;
#include "imx6q.dtsi"
/ {
<span style="white-space:pre"> </span>model = "Freescale i.MX6 Quad SABRE Smart Device Board";
<span style="white-space:pre"> </span>compatible = "fsl,imx6q-sabresd", "fsl,imx6q";
<span style="white-space:pre"> </span>memory {
<span style="white-space:pre"> </span>reg = <0x10000000 0x80000000>;
<span style="white-space:pre"> </span>};
};
&uart1 {
<span style="white-space:pre"> </span>pinctrl-names = "default";
<span style="white-space:pre"> </span>pinctrl-0 = <&pinctrl_uart1_2>;
<span style="white-space:pre"> </span>status = "okay";
};
&usdhc2 {
<span style="white-space:pre"> </span>pinctrl-names = "default";
<span style="white-space:pre"> </span>pinctrl-0 = <&pinctrl_usdhc2_2>;
<span style="white-space:pre"> </span>cd-gpios = <&gpio1 4 0>;
<span style="white-space:pre"> </span>wp-gpios = <&gpio1 2 0>;
<span style="white-space:pre"> </span>no-1-8-v;
<span style="white-space:pre"> </span>keep-power-in-suspend;
<span style="white-space:pre"> </span>enable-sdio-wakeup;
<span style="white-space:pre"> </span>status = "okay";
};
&iomuxc {
<span style="white-space:pre"> </span>pinctrl-names = "default";
<span style="white-space:pre"> </span>uart1 {
<span style="white-space:pre"> </span>pinctrl_uart1_2: uart1grp-2 {
<span style="white-space:pre"> </span>fsl,pins = <
<span style="white-space:pre"> </span>MX6QDL_PAD_SD3_DAT7__UART1_TX_DATA 0x1b0b1
<span style="white-space:pre"> </span>MX6QDL_PAD_SD3_DAT6__UART1_RX_DATA 0x1b0b1
<span style="white-space:pre"> </span>>;
<span style="white-space:pre"> </span>};
<span style="white-space:pre"> </span>};
};
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：
git checkout imx6qdl.dtsi
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:
sudo mkfs.ext3 /dev/sdb1
或者
sudo mkfs.ext4 /dev/sdb1
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。
sudo mount /dev/sdb1 /mnt
sudo tar jxf rootfs.tar.bz2 -C /mnt
sudo mv /mnt/rootfs/* /mnt
sudo rm /mnt/rootfs
sudo umount /mnt
至此，就完成了根文件系统的制作。
配置uboot环境变量
setenv bootargs 'noinitrd console=ttymxc0,115200 root=/dev/mmcblk0p1 rw init=/linuxrc'
setenv bootcmd 'mmc dev 0; mmc read 0x11ffffc0 0x800 0x3000; mmc read 0x18000000 0x5000 0x800; bootm 0x11ffffc0 - 0x18000000'
saveenv
之后重启开发板即可。
效果展示
启动Log如下：
U-Boot 2013.04-04987-g98fdbdc-dirty (May 03 2015 - 11:46:24)
CPU: Freescale i.MX6Q rev1.2 at 792 MHz
CPU: Temperature 27 C, calibration data: 0x54e4bb69
Reset cause: POR
Board: MX6Q/SDL-SabreSD
I2C: ready
DRAM:1 GiB
MMC: FSL_SDHC: 0, FSL_SDHC: 1, FSL_SDHC: 2
No panel detected: default to Hannstar-XGA
Display: Hannstar-XGA (1024x768)
In: serial
Out: serial
Err: serial
mmc0 is current device
Net: Phy not found
PHY reset timed out
FEC
Warning: failed to set MAC address
Normal Boot
Hit any key to stop autoboot:0
mmc0 is current device
MMC read: dev # 0, block # 2048, count 12288 ... 12288 blocks read: OK
MMC read: dev # 0, block # 20480, count 2048 ... 2048 blocks read: OK
## Booting kernel from Legacy Image at 11ffffc0 ...
Image Name: Linux-3.10.17-80739-g33597e3-dir
Image Type: ARM Linux Kernel Image (uncompressed)
Data Size: 5289224 Bytes = 5 MiB
Load Address: 12000000
Entry Point:12000000
Verifying Checksum ... OK
## Flattened Device Tree blob at 18000000
Booting using the fdt blob at 0x18000000
XIP Kernel Image ... OK
OK
Using Device Tree in place at 18000000, end 1800befb
Starting kernel ...
Booting Linux on physical CPU 0x0
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
CPU: ARMv7 Processor revision 10 (ARMv7), cr=10c53c7d
CPU: PIPT / VIPT nonaliasing data cache, VIPT aliasing instruction cache
Machine: Freescale i.MX6 Quad/DualLite (Device Tree), model: Freescale i.MX6 Quad SABRE Smart Device Board
cma: CMA: reserved 320 MiB at 3c000000
Memory policy: ECC disabled, Data cache writealloc
PERCPU: Embedded 8 pages/cpu @814f8000 s8896 r8192 d15680 u32768
Built 1 zonelists in Zone order, mobility grouping on.Total pages: 260096
Kernel command line: noinitrd console=ttymxc0,115200 root=/dev/mmcblk0p1 rw rootfstype=ext4 init=/linuxrc
PID hash table entries: 4096 (order: 2, 16384 bytes)
Dentry cache hash table entries: 131072 (order: 7, 524288 bytes)
Inode-cache hash table entries: 65536 (order: 6, 262144 bytes)
Memory: 1024MB = 1024MB total
Memory: 697800k/697800k available, 350776k reserved, 0K highmem
Virtual kernel memory layout:
vector: 0xffff0000 - 0xffff1000 ( 4 kB)
fixmap: 0xfff00000 - 0xfffe0000 ( 896 kB)
vmalloc : 0xc0800000 - 0xff000000 (1000 MB)
lowmem: 0x80000000 - 0xc0000000 (1024 MB)
pkmap : 0x7fe00000 - 0x80000000 ( 2 MB)
modules : 0x7f000000 - 0x7fe00000 (14 MB)
.text : 0x80008000 - 0x80be704c (12157 kB)
.init : 0x80be8000 - 0x80c2a2c0 ( 265 kB)
.data : 0x80c2c000 - 0x80c7c260 ( 321 kB)
.bss : 0x80c7c260 - 0x80ce5434 ( 421 kB)
SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=4, Nodes=1
Preemptible hierarchical RCU implementation.
NR_IRQS:16 nr_irqs:16 16
L310 cache controller enabled
l2x0: 16 ways, CACHE_ID 0x410000c7, AUX_CTRL 0x32070000, Cache size: 1048576 B
sched_clock: 32 bits at 3000kHz, resolution 333ns, wraps every 1431655ms
CPU identified as i.MX6Q, silicon rev 1.2
Console: colour dummy device 80x30
Calibrating delay loop... 1581.05 BogoMIPS (lpj=7905280)
pid_max: default: 32768 minimum: 301
Mount-cache hash table entries: 512
CPU: Testing write buffer coherency: ok
CPU0: thread -1, cpu 0, socket 0, mpidr 80000000
Setting up static identity map for 0x80610608 - 0x80610660
CPU1: Booted secondary processor
CPU1: thread -1, cpu 1, socket 0, mpidr 80000001
CPU2: Booted secondary processor
CPU2: thread -1, cpu 2, socket 0, mpidr 80000002
CPU3: Booted secondary processor
CPU3: thread -1, cpu 3, socket 0, mpidr 80000003
Brought up 4 CPUs
SMP: Total of 4 processors activated (6324.22 BogoMIPS).
CPU: All CPU(s) started in SVC mode.
devtmpfs: initialized
pinctrl core: initialized pinctrl subsystem
regulator-dummy: no parameters
NET: Registered protocol family 16
DMA: preallocated 256 KiB pool for atomic coherent allocations
Use WDOG1 as reset source
syscon 20c8000.anatop: regmap registered
vdd1p1: 800 <--> 1375 mV at 1125 mV
vdd3p0: 2800 <--> 3150 mV at 3000 mV
vdd2p5: 2000 <--> 2750 mV at 2425 mV
cpu: 725 <--> 1450 mV at 1150 mV
vddpu: 725 <--> 1450 mV
vddsoc: 725 <--> 1450 mV at 1200 mV
syscon 20e0000.iomuxc-gpr: regmap registered
syscon 21bc000.ocotp-ctrl: regmap registered
hw-breakpoint: found 5 (+1 reserved) breakpoint and 1 watchpoint registers.
hw-breakpoint: maximum watchpoint size is 4 bytes.
imx6q-pinctrl 20e0000.iomuxc: initialized IMX pinctrl driver
bio: create slab <bio-0> at 0
mxs-dma 110000.dma-apbh: initialized
i2c-core: driver using legacy suspend method
i2c-core: driver using legacy resume method
SCSI subsystem initialized
usbcore: registered new interface driver usbfs
usbcore: registered new interface driver hub
usbcore: registered new device driver usb
Linux video capture interface: v2.00
pps_core: LinuxPPS API ver. 1 registered
pps_core: Software ver. 5.3.6 - Copyright 2005-2007 Rodolfo Giometti <giometti@linux.it>
PTP clock support registered
imx-ipuv3 2400000.ipu: IPU DMFC NORMAL mode: 1(0~1), 5B(4,5), 5F(6,7)
imx-ipuv3 2800000.ipu: IPU DMFC NORMAL mode: 1(0~1), 5B(4,5), 5F(6,7)
MIPI CSI2 driver module loaded
Advanced Linux Sound Architecture Driver Initialized.
cfg80211: Calling CRDA to update world regulatory domain
Switching to clocksource mxc_timer1
NET: Registered protocol family 2
TCP established hash table entries: 8192 (order: 4, 65536 bytes)
TCP bind hash table entries: 8192 (order: 4, 65536 bytes)
TCP: Hash tables configured (established 8192 bind 8192)
TCP: reno registered
UDP hash table entries: 512 (order: 2, 16384 bytes)
UDP-Lite hash table entries: 512 (order: 2, 16384 bytes)
NET: Registered protocol family 1
RPC: Registered named UNIX socket transport module.
RPC: Registered udp transport module.
RPC: Registered tcp transport module.
RPC: Registered tcp NFSv4.1 backchannel transport module.
hw perfevents: enabled with ARMv7 Cortex-A9 PMU driver, 7 counters available
pureg-dummy: no parameters
imx6_busfreq busfreq.15: DDR medium rate not supported.
Bus freq driver module loaded
VFS: Disk quotas dquot_6.5.2
Dquot-cache hash table entries: 1024 (order 0, 4096 bytes)
NFS: Registering the id_resolver key type
Key type id_resolver registered
Key type id_legacy registered
jffs2: version 2.2. (NAND) 漏 2001-2006 Red Hat, Inc.
fuse init (API version 7.22)
msgmni has been set to 2002
io scheduler noop registered
io scheduler deadline registered
io scheduler cfq registered (default)
imx-weim 21b8000.weim: WEIM driver registered.
MIPI DSI driver module loaded
imx-sdma 20ec000.sdma: no iram assigned, using external mem
imx-sdma 20ec000.sdma: loaded firmware 1.1
imx-sdma 20ec000.sdma: initialized
Serial: IMX driver
2020000.serial: ttymxc0 at MMIO 0x2020000 (irq = 58) is a IMX
console enabled
serial: Freescale lpuart driver
Initialized drm 1.1.0 20060810
Initialized vivante 1.0.0 20120216 on minor 0
brd: module loaded
loop: module loaded
CAN device driver interface
ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
usbcore: registered new interface driver usb-storage
mousedev: PS/2 mouse device common for all mice
i2c-core: driver using legacy suspend method
i2c-core: driver using legacy resume method
snvs_rtc 20cc034.snvs-rtc-lp: rtc core: registered 20cc034.snvs-rtc-lp as rtc0
i2c /dev entries driver
i2c-core: driver using legacy suspend method
i2c-core: driver using legacy resume method
imx2-wdt 20bc000.wdog: IMX2+ Watchdog Timer enabled. timeout=60s (nowayout=0)
cpuidle: using governor ladder
cpuidle: using governor menu
sdhci: Secure Digital Host Controller Interface driver
sdhci: Copyright(c) Pierre Ossman
sdhci-pltfm: SDHCI platform and OF driver helper
mmc0: no vqmmc regulator found
mmc0: no vmmc regulator found
mmc0: SDHCI controller on 2194000.usdhc using ADMA
mmc0: host does not support reading read-only switch. assuming write-enable.
mmc0: new high speed SDHC card at address e624
mmcblk0: mmc0:e624 SS08G 7.40 GiB
mmcblk0: p1
Galcore version 4.6.9.9754
mxc_vdoa 21e4000.vdoa: i.MX Video Data Order Adapter(VDOA) driver probed
mxc_asrc 2034000.asrc: mxc_asrc registered
mxc_vpu 2040000.vpu: VPU initialized
caam 2100000.caam: device ID = 0x0a16010000000000 (Era -524)
caam 2100000.caam: job rings = 2, qi = 0
caam 2100000.caam: authenc-hmac-md5-cbc-aes-caam
caam 2100000.caam: authencesn-hmac-md5-cbc-aes-caam
caam 2100000.caam: authenc-hmac-sha1-cbc-aes-caam
caam 2100000.caam: authencesn-hmac-sha1-cbc-aes-caam
caam 2100000.caam: authenc-hmac-sha224-cbc-aes-caam
caam 2100000.caam: authencesn-hmac-sha224-cbc-aes-caam
caam 2100000.caam: authenc-hmac-sha256-cbc-aes-caam
caam 2100000.caam: authencesn-hmac-sha256-cbc-aes-caam
caam 2100000.caam: authenc-hmac-md5-cbc-des3_ede-caam
caam 2100000.caam: authencesn-hmac-md5-cbc-des3_ede-caam
caam 2100000.caam: authenc-hmac-sha1-cbc-des3_ede-caam
caam 2100000.caam: authencesn-hmac-sha1-cbc-des3_ede-caam
caam 2100000.caam: authenc-hmac-sha224-cbc-des3_ede-caam
caam 2100000.caam: authencesn-hmac-sha224-cbc-des3_ede-caam
caam 2100000.caam: authenc-hmac-sha256-cbc-des3_ede-caam
caam 2100000.caam: authencesn-hmac-sha256-cbc-des3_ede-caam
caam 2100000.caam: authenc-hmac-md5-cbc-des-caam
caam 2100000.caam: authencesn-hmac-md5-cbc-des-caam
caam 2100000.caam: authenc-hmac-sha1-cbc-des-caam
caam 2100000.caam: authencesn-hmac-sha1-cbc-des-caam
caam 2100000.caam: authenc-hmac-sha224-cbc-des-caam
caam 2100000.caam: authencesn-hmac-sha224-cbc-des-caam
caam 2100000.caam: authenc-hmac-sha256-cbc-des-caam
caam 2100000.caam: authencesn-hmac-sha256-cbc-des-caam
caam 2100000.caam: ecb-des-caam
caam 2100000.caam: ecb-arc4-caam
caam 2100000.caam: ecb-aes-caam
caam 2100000.caam: ctr-aes-caam
caam 2100000.caam: cbc-aes-caam
caam 2100000.caam: ecb-des3-caam
caam 2100000.caam: cbc-3des-caam
caam 2100000.caam: cbc-des-caam
caam 2100000.caam: fsl,sec-v4.0 algorithms registered in /proc/crypto
platform 2101000.jr0: registering rng-caam
platform caam_sm: caam_sm_test: 8-byte key test match OK
platform caam_sm: caam_sm_test: 16-byte key test match OK
platform caam_sm: caam_sm_test: 32-byte key test match OK
platform caam_secvio.16: security violation service handlers armed
usbcore: registered new interface driver usbhid
usbhid: USB HID core driver
i2c-core: driver using legacy suspend method
i2c-core: driver using legacy resume method
TCP: cubic registered
NET: Registered protocol family 10
sit: IPv6 over IPv4 tunneling driver
NET: Registered protocol family 17
can: controller area network core (rev 20120528 abi 9)
NET: Registered protocol family 29
can: raw protocol (rev 20120528)
can: broadcast manager protocol (rev 20120528 t)
can: netlink gateway (rev 20130117) max_hops=1
8021q: 802.1Q VLAN Support v1.8
Key type dns_resolver registered
VFP support v0.3: implementor 41 architecture 3 part 30 variant 9 rev 4
snvs_rtc 20cc034.snvs-rtc-lp: setting system clock to 1970-01-01 00:01:12 UTC (72)
ALSA device list:
No soundcards found.
EXT4-fs (mmcblk0p1): recovery complete
EXT4-fs (mmcblk0p1): mounted filesystem with ordered data mode. Opts: (null)
VFS: Mounted root (ext4 filesystem) on device 179:1.
devtmpfs: mounted
Freeing unused kernel memory: 264K (80be8000 - 80c2a000)
----------mount all..........
----------Starting mdev......
Please press Enter to activate this console.
@tqimx6q #
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。
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