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2020年12月30日 | I.MX6Q(TQIMX6Q/TQE9)学习笔记——新版BSP之根文件系统挂载

2020-12-30 来源：eefocus

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：

* 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"

/ {

model = "Freescale i.MX6 Quad SABRE Smart Device Board";

compatible = "fsl,imx6q-sabresd", "fsl,imx6q";

memory {

reg = <0x10000000 0x80000000>;

};

&uart1 {

pinctrl-names = "default";

pinctrl-0 = <&pinctrl_uart1_2>;

status = "okay";

};

&usdhc2 {

pinctrl-names = "default";

pinctrl-0 = <&pinctrl_usdhc2_2>;

cd-gpios = <&gpio1 4 0>;

wp-gpios = <&gpio1 2 0>;

no-1-8-v;

keep-power-in-suspend;

enable-sdio-wakeup;

status = "okay";

};

&iomuxc {

pinctrl-names = "default";

uart1 {

pinctrl_uart1_2: uart1grp-2 {

fsl,pins = <

MX6QDL_PAD_SD3_DAT7__UART1_TX_DATA 0x1b0b1

MX6QDL_PAD_SD3_DAT6__UART1_RX_DATA 0x1b0b1

};

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 [PRIME]

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

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 [412fc09a] 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 [mem 0x020c8000-0x020c8fff] 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 [mem 0x020e0000-0x020e0037] registered

syscon 21bc000.ocotp-ctrl: regmap [mem 0x021bc000-0x021bffff] 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 at 0

mxs-dma 110000.dma-apbh: initialized

i2c-core: driver [max17135] using legacy suspend method

i2c-core: driver [max17135] 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

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.

I MX6Q TQIMX6Q TQE9 BSP 根文件系统挂载

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