扇区大小:SD卡的扇区大小一般为512字节, SD卡的分区都是以扇区为单位的
从之前的文章 EasyArm_IMX280A_SD分区详解.pdf 我们已经知道了, 要想从SD卡启动, 该SD卡必须使用MBR格式的分区表, MBR记录了该SD上各个分区的地址, 大小和文件系统类型等信息。其中, 启动分区的文件系统标志必须为0x53。
在启动分区的第一个扇区的开始位置必须包含BCB(Boot Control Block)数据, 该BCB数据指明了启动镜像(u-boot.sb)的地址和大小。
在Windows下使用cfimager.exe制作SD卡启动盘的时候, 改工具自动帮我们在SD卡上创建了3个分区：
- 一个FAT32分区(
10), 用于存放uImage,zImage和设备树文件; - 一个
rootfs分区(b), 用于存放根文件系统; - 一个
uboot分区(53), 用于存放BCB和u-boot.sb镜像, 该分区为启动引导分区(0x53);
那么我们可不可以自己手动给SD分区, 制作可启动的SD卡呢？当然是可以的, 在linux系统上, 只需要使用fdisk, mkfs, dd, mxsboot(uboot自带的tools)这几个工具就可以制作一个可启动的SD卡。
u-boot默认的启动参数如下(
printenv,已忽略nand部分):
baudrate=115200
boot_fdt=try
bootcmd=mmc dev ${mmcdev}; if mmc rescan; then if run loadbootscript; then run bootscript; else if run loadimage; then run mmcboot; else run netboot; fi; fi; else run netboot; fi
bootscript=echo Running bootscript from mmc ...; source
console_mainline=ttyAMA0
fdt_addr=0x41000000
fdt_file=imx28-evk.dtb
image=zImage
loadaddr=0x42000000
loadbootscript=fatload mmc ${mmcdev}:${mmcpart} ${loadaddr} ${script};
loadfdt=fatload mmc ${mmcdev}:${mmcpart} ${fdt_addr} ${fdt_file}
loadimage=fatload mmc ${mmcdev}:${mmcpart} ${loadaddr} ${image}
mmcargs=setenv bootargs console=${console_mainline},${baudrate} root=${mmcroot}
mmcboot=echo Booting from mmc ...; run mmcargs; if test ${boot_fdt} = yes || test ${boot_fdt} = try; then if run loadfdt; then bootz ${loadaddr} - ${fdt_addr}; else if test ${boot_fdt} = try; then bootz; else echo WARN: Cannot load the DT; fi; fi; else bootz; fi;
mmcdev=0
mmcpart=2
mmcroot=/dev/mmcblk0p3 rw rootwait
script=boot.scr把bootcmd展开如下:
mmc dev ${mmcdev};
if mmc rescan; then
if run loadbootscript; then
run bootscript;
else
if run loadimage; then
run mmcboot;
else
run netboot;
fi;
fi;
else
run netboot;
fi把mmcboot展开如下:
echo Booting from mmc ...;
run mmcargs;
if test ${boot_fdt} = yes || test ${boot_fdt} = try; then
if run loadfdt; then
bootz ${loadaddr} - ${fdt_addr};
else
if test ${boot_fdt} = try; then
bootz;
else
echo WARN: Cannot load the DT;
fi;
fi;
else
bootz;
fi;loadbootscript表示从SD卡加载启动脚本
boot.scr,这里可以忽略.最关键的地方就是loadimage和mmcboot
loadimage表示从SD卡的
mmcdev:mmcpart==>0:2分区上加载zImage到内存的0x42000000地址上, 也就是说zImage保存在SD卡的第二分区上,fatload表明了该分区是一个fat32分区
mmcdev=0
mmcpart=2
image=zImage
loadaddr=0x42000000
loadimage=fatload mmc ${mmcdev}:${mmcpart} ${loadaddr} ${image}
loadfdt同样表示从SD卡的第二分区上加载设备树文件imx28-evk.dtb到内存的0x41000000地址上,最后通过bootz命令启动内核
mmcdev=0
mmcpart=2
fdt_addr=0x41000000
fdt_file=imx28-evk.dtb
loadfdt=fatload mmc ${mmcdev}:${mmcpart} ${fdt_addr} ${fdt_file}由此可见,按照uboot默认的方式, SD卡的第二分区应该是FAT32分区.FAT32分区可以直接在Windows系统上读写,这样做的好处是,如果改变了uboot,zImage或设备树,不需要重新烧写SD卡,只要用新的文件替换SD卡上的文件即可.
kernel的bootargs启动参数如下:
run mmcargs
mmcargs=setenv bootargs console=${console_mainline},${baudrate} root=${mmcroot}
mmcroot=/dev/mmcblk0p3 rw rootwait其中root=/dev/mmcblk0p3 rw rootwait, 由此可见, rootfs应该放在SD卡的第三分区上.
剩下的,u-boot.sb镜像自然应该放在SD卡的第一分区上,并且该分区应该是启动引导分区,必须包含BCB信息.
这个BCB信息应该怎么生成呢?这里就必须要用到官方提供的mxsboot这个工具了.
这个工具会生成一个分区镜像,在分区镜像的头部填充BCB信息,并且把u-boot.sb镜像放入该分区镜像的相应位置.
使用时,只需要用以下命令就可以生成一个包含BCB和u-boot镜像的启动分区镜像u-boot.sd,可以用dd命令直接把u-boot.sd写入启动分区中.
$ ./tools/mxsboot sd u-boot.sb u-boot.sd
$ dd if=u-boot.sd of=/dev/mmcblk0p1mxsboot的源码在tools\mxsboot.c中,其关键代码如下:
mxsboot.c
/*
* Sector on which the SigmaTel boot partition (0x53) starts.
*/
static uint32_t sd_sector = 2048;
struct mx28_sd_drive_info {
uint32_t chip_num;
uint32_t drive_type;
uint32_t tag;
uint32_t first_sector_number;
uint32_t sector_count;
};
struct mx28_sd_config_block {
uint32_t signature;
uint32_t primary_boot_tag;
uint32_t secondary_boot_tag;
uint32_t num_copies;
struct mx28_sd_drive_info drv_info[1];
};
static int mx28_create_sd_image(int infd, int outfd)
{
int ret = -1;
uint32_t *buf;
int size;
off_t fsize;
ssize_t wr_size;
struct mx28_sd_config_block *cb;
fsize = lseek(infd, 0, SEEK_END);
lseek(infd, 0, SEEK_SET);
size = fsize + 4 * 512; //u-boot.sb的大小+4个扇区的BCB信息
buf = malloc(size);
if (!buf) {
printf("Can not allocate output buffer of %d bytes\n", size);
goto err0;
}
//把u-boot.sb放入分区镜像的第四个扇区之后的位置(从第五个扇区开始),这里是相对地址
ret = read(infd, (uint8_t *)buf + 4 * 512, fsize);
if (ret != fsize) {
ret = -1;
goto err1;
}
//前四个扇区用于存放BCB,这里是相对地址
cb = (struct mx28_sd_config_block *)buf;
cb->signature = cpu_to_le32(0x00112233);
cb->primary_boot_tag = cpu_to_le32(0x1);
cb->secondary_boot_tag = cpu_to_le32(0x1);
cb->num_copies = cpu_to_le32(1);
cb->drv_info[0].chip_num = cpu_to_le32(0x0);
cb->drv_info[0].drive_type = cpu_to_le32(0x0);
cb->drv_info[0].tag = cpu_to_le32(0x1);
//u-boot.sb的绝对扇区号 : 分区起始扇区号(sd_sector) + 偏移BCB大小(分区前4扇区)
cb->drv_info[0].first_sector_number = cpu_to_le32(sd_sector + 4);
cb->drv_info[0].sector_count = cpu_to_le32((size - 4) / 512);
wr_size = write(outfd, buf, size);
if (wr_size != size) {
ret = -1;
goto err1;
}
ret = 0;
err1:
free(buf);
err0:
return ret;
}由上可知,默认情况下,mxsboot认为uboot启动分区的起始扇区号是2048,而u-boot.sb镜像的位置会在此基础上再偏移4个扇区,也就是2052号扇区.
实际上,我们在使用fdisk给SD卡分区的时候,默认的第一个分区也是从SD卡的第2048号扇区开始的.SD卡的前部预留了2048个扇区的大小(共2048*512字节).
不知道你有没有注意到一个问题,为什么没有考虑uboot的环境变量呢?它也是保存再SD卡上的,但是我们为什么没有为它预留一部分空间呢?
是的没错,我们目前为止的确没考虑到这一点,那让我们看看uboot中是把环境变量保存在哪个位置的,在configs/mx28evk_defconfig#L7中可以找到如下定义:
CONFIG_ENV_SIZE=0x4000
CONFIG_ENV_OFFSET=0x40000这里的单位是字节,而不是扇区了,由此可见,uboot中把环境变量保存在SD卡从0地址开始的第0x40000 == 262,144字节处,大小为0x4000 == 16,384字节.
上面我们说过,使用fdisk对SD卡分区的时候,会在SD前部预留2048个扇区,也就是2048*512=1,048,576字节,uboot的环境变量刚好就放在这部分预留的空间上
因此不必担心,uboot已经为我们考虑的很周到了.
通过以上分析,我们已经弄清楚了SD卡的分区情况,总结如下:
| 分区 | ID | 作用 | 大小 |
|---|---|---|---|
| 第一分区 | 0x53 | UBOOT启动分区 | 1M |
| 第二分区 | 0x0b | FAT32分区 | 100M |
| 第三分区 | 0x10 | ROOTFS分区 | SD卡剩余空间 |
$ sudo fdisk /dev/${sdcard}
* o ..................... create a clear partition table
* n ..................... create new partition
* p ................. primary partition
* 1 ................. first partition(uboot)
* (default) ......... first sector is 2048
* +1M ............... make the partition 1Mb big
* n ..................... create new partition
* p ................. primary partition
* 2 ................. second partition(fat32)
* (default) ......... first sector is 2048(default)
* +100M ............. make the partition 100Mb big
* n ..................... create new partition
* p ................. primary partition
* 3 ................. third partition
* (default) ......... first sector is 2048(default)
* (default) ......... use all remaining space
* t ..................... change partition ID
* 1 ................. change first partition ID
* 53 ................ change the ID to 0x53 (OnTrack DM6 Aux3)
* t ..................... change partition ID
* 2 ................. change second partition ID
* b ................. change the ID to 0x0b (Win95 FAT32)
* t ..................... change partition ID
* 3 ................. change third partition ID
* 10 ................ change the ID to 0x10 (OPUS)
* w ..................... write partition table to disk
$ sudo fdisk -l /dev/sdd
Disk /dev/sdd: 7.5 GiB, 8068792320 bytes, 15759360 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0xdd654323
Device Boot Start End Sectors Size Id Type
/dev/sdd1 2048 4095 2048 1M 53 OnTrack DM6 Aux3
/dev/sdd2 4096 208895 204800 100M b W95 FAT32
/dev/sdd3 208896 15759359 15550464 7.4G 10 OPUS
$ mkfs.fat /dev/${sdcard}2
$ mkdir /tmp/fat32
$ mount /dev/${sdcard}2 /tmp/fat32
$ cp uImage /tmp/fat32/
$ cp zImage /tmp/fat32/
$ cp imx28-evk.dtb /tmp/fat32/
$ dd if=u-boot.sd of=/dev/${sdcard}1
$ dd if=rootfs.full.img of=/dev/${sdcard}3bootlog
U-Boot 2020.07-rc4 (Jul 04 2020 - 00:14:52 +0800)
CPU: Freescale i.MX28 rev1.2 at 454 MHz
BOOT: SSP SD/MMC #0, 3V3
DRAM: 64 MiB
NAND: use legacy bch geometry
128 MiB
MMC: MXS MMC: 0
Loading Environment from MMC... *** Warning - bad CRC, using default environment
In: serial
Out: serial
Err: serial
Net: FEC0 [PRIME]
Hit any key to stop autoboot: 0
switch to partitions #0, OK
mmc0 is current device
5300920 bytes read in 1600 ms (3.2 MiB/s)
Booting from mmc ...
22122 bytes read in 41 ms (526.4 KiB/s)
Kernel image @ 0x42000000 [ 0x000000 - 0x50e2b8 ]
## Flattened Device Tree blob at 41000000
Booting using the fdt blob at 0x41000000
Loading Device Tree to 43b39000, end 43b41669 ... OK
Starting kernel ...
[ 0.000000] Booting Linux on physical CPU 0x0
[ 0.000000] Linux version 5.5.5-g7070cea-dirty (wnavy@wnavy-vm) (gcc version 9.2.0 (crosstool-NG 1.24.0.105_5659366)) #1 Tue Jul 7 00:38:11 CST 2020
[ 0.000000] CPU: ARM926EJ-S [41069265] revision 5 (ARMv5TEJ), cr=0005317f
[ 0.000000] CPU: VIVT data cache, VIVT instruction cache
[ 0.000000] OF: fdt: Machine model: Freescale i.MX28 Evaluation Kit
[ 0.000000] Memory policy: Data cache writeback
[ 0.000000] Built 1 zonelists, mobility grouping on. Total pages: 16256
[ 0.000000] Kernel command line: console=ttyAMA0,115200 root=/dev/mmcblk0p3 rw rootwait
[ 0.000000] Dentry cache hash table entries: 8192 (order: 3, 32768 bytes, linear)
[ 0.000000] Inode-cache hash table entries: 4096 (order: 2, 16384 bytes, linear)
[ 0.000000] mem auto-init: stack:off, heap alloc:off, heap free:off
[ 0.000000] Memory: 47544K/65536K available (7092K kernel code, 635K rwdata, 2648K rodata, 324K init, 6368K bss, 17992K reserved, 0K cma-reserved)
[ 0.000000] SLUB: HWalign=32, Order=0-3, MinObjects=0, CPUs=1, Nodes=1
[ 0.000000] Running RCU self tests
[ 0.000000] NR_IRQS: 16, nr_irqs: 16, preallocated irqs: 16
[ 0.000000] random: get_random_bytes called from start_kernel+0x2b4/0x4e0 with crng_init=0
[ 0.000000] clocksource: mxs_timer: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 79635851949 ns
[ 0.000038] sched_clock: 32 bits at 24MHz, resolution 41ns, wraps every 89478484971ns
[ 0.002257] Console: colour dummy device 80x30
[ 0.002429] Lock dependency validator: Copyright (c) 2006 Red Hat, Inc., Ingo Molnar
[ 0.002491] ... MAX_LOCKDEP_SUBCLASSES: 8
[ 0.002544] ... MAX_LOCK_DEPTH: 48
[ 0.002592] ... MAX_LOCKDEP_KEYS: 8192
[ 0.002638] ... CLASSHASH_SIZE: 4096
[ 0.002685] ... MAX_LOCKDEP_ENTRIES: 32768
[ 0.002733] ... MAX_LOCKDEP_CHAINS: 65536
[ 0.002780] ... CHAINHASH_SIZE: 32768
[ 0.002828] memory used by lock dependency info: 3997 kB
[ 0.002877] memory used for stack traces: 2112 kB
[ 0.002925] per task-struct memory footprint: 1536 bytes
[ 0.003267] Calibrating delay loop... 226.09 BogoMIPS (lpj=1130496)
[ 0.071546] pid_max: default: 32768 minimum: 301
[ 0.072633] Mount-cache hash table entries: 1024 (order: 0, 4096 bytes, linear)
[ 0.072758] Mountpoint-cache hash table entries: 1024 (order: 0, 4096 bytes, linear)
[ 0.083465] CPU: Testing write buffer coherency: ok
[ 0.094288] Setting up static identity map for 0x40008400 - 0x40008458
[ 0.103232] devtmpfs: initialized
[ 0.178418] clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 19112604462750000 ns
[ 0.178695] futex hash table entries: 256 (order: 1, 11264 bytes, linear)
[ 0.180643] pinctrl core: initialized pinctrl subsystem
[ 0.196613] NET: Registered protocol family 16
[ 0.199970] DMA: preallocated 256 KiB pool for atomic coherent allocations
[ 0.428485] Serial: AMBA PL011 UART driver
[ 0.432586] 80074000.serial: ttyAMA0 at MMIO 0x80074000 (irq = 222, base_baud = 0) is a PL011 rev2
[ 0.713981] printk: console [ttyAMA0] enabled
[ 0.889110] mxs-dma 80004000.dma-apbh: initialized
[ 0.908854] mxs-dma 80024000.dma-apbx: initialized
[ 0.946217] SCSI subsystem initialized
[ 0.953954] usbcore: registered new interface driver usbfs
[ 0.960612] usbcore: registered new interface driver hub
[ 0.966849] usbcore: registered new device driver usb
[ 0.984452] pps_core: LinuxPPS API ver. 1 registered
[ 0.989523] pps_core: Software ver. 5.3.6 - Copyright 2005-2007 Rodolfo Giometti <[email protected]>
[ 0.999158] PTP clock support registered
[ 1.006525] Advanced Linux Sound Architecture Driver Initialized.
[ 1.024400] clocksource: Switched to clocksource mxs_timer
[ 2.655197] random: fast init done
[ 3.630761] NET: Registered protocol family 2
[ 3.641319] tcp_listen_portaddr_hash hash table entries: 128 (order: 0, 5120 bytes, linear)
[ 3.650374] TCP established hash table entries: 1024 (order: 0, 4096 bytes, linear)
[ 3.658496] TCP bind hash table entries: 1024 (order: 3, 36864 bytes, linear)
[ 3.666357] TCP: Hash tables configured (established 1024 bind 1024)
[ 3.674116] UDP hash table entries: 256 (order: 2, 20480 bytes, linear)
[ 3.681431] UDP-Lite hash table entries: 256 (order: 2, 20480 bytes, linear)
[ 3.690246] NET: Registered protocol family 1
[ 3.702827] RPC: Registered named UNIX socket transport module.
[ 3.709385] RPC: Registered udp transport module.
[ 3.714183] RPC: Registered tcp transport module.
[ 3.719191] RPC: Registered tcp NFSv4.1 backchannel transport module.
[ 3.742843] workingset: timestamp_bits=30 max_order=14 bucket_order=0
[ 3.852491] NFS: Registering the id_resolver key type
[ 3.860031] Key type id_resolver registered
[ 3.864847] Key type id_legacy registered
[ 3.869574] jffs2: version 2.2. (NAND) © 2001-2006 Red Hat, Inc.
[ 3.881311] Block layer SCSI generic (bsg) driver version 0.4 loaded (major 248)
[ 3.889453] io scheduler mq-deadline registered
[ 3.894102] io scheduler kyber registered
[ 3.906141] pwm-backlight backlight: backlight supply power not found, using dummy regulator
[ 3.927051] 8006a000.serial: ttyAPP0 at MMIO 0x8006a000 (irq = 220, base_baud = 1500000) is a 8006a000.serial
[ 3.939733] mxs-auart 8006a000.serial: Found APPUART 3.1.0
[ 3.947635] 8006c000.serial: ttyAPP1 at MMIO 0x8006c000 (irq = 221, base_baud = 1500000) is a 8006c000.serial
[ 3.960154] mxs-auart 8006c000.serial: Found APPUART 3.1.0
[ 8.032732] nand: device found, Manufacturer ID: 0xc2, Chip ID: 0xf1
[ 8.039446] nand: Macronix NAND 128MiB 3,3V 8-bit
[ 8.044253] nand: 128 MiB, SLC, erase size: 128 KiB, page size: 2048, OOB size: 64
[ 8.052280] Scanning device for bad blocks
[ 8.612323] Bad eraseblock 850 at 0x000006a40000
[ 8.759365] gpmi-nand 8000c000.gpmi-nand: driver registered.
[ 8.797974] spi-nor spi1.0: unrecognized JEDEC id bytes: ff ff ff ff ff ff
[ 8.811453] libphy: Fixed MDIO Bus: probed
[ 8.967174] libphy: fec_enet_mii_bus: probed
[ 8.978260] usbcore: registered new interface driver asix
[ 8.984151] usbcore: registered new interface driver ax88179_178a
[ 8.991075] usbcore: registered new interface driver cdc_ether
[ 8.997805] usbcore: registered new interface driver smsc95xx
[ 9.004026] usbcore: registered new interface driver net1080
[ 9.010418] usbcore: registered new interface driver cdc_subset
[ 9.017062] usbcore: registered new interface driver zaurus
[ 9.023305] usbcore: registered new interface driver cdc_ncm
[ 9.029310] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
[ 9.036939] usbcore: registered new interface driver usb-storage
[ 9.068170] ci_hdrc ci_hdrc.0: EHCI Host Controller
[ 9.074195] ci_hdrc ci_hdrc.0: new USB bus registered, assigned bus number 1
[ 9.104682] ci_hdrc ci_hdrc.0: USB 2.0 started, EHCI 1.00
[ 9.128549] hub 1-0:1.0: USB hub found
[ 9.133663] hub 1-0:1.0: 1 port detected
[ 9.158503] ci_hdrc ci_hdrc.1: EHCI Host Controller
[ 9.163730] ci_hdrc ci_hdrc.1: new USB bus registered, assigned bus number 2
[ 9.194731] ci_hdrc ci_hdrc.1: USB 2.0 started, EHCI 1.00
[ 9.208329] hub 2-0:1.0: USB hub found
[ 9.212604] hub 2-0:1.0: 1 port detected
[ 9.232317] stmp3xxx-rtc 80056000.rtc: registered as rtc0
[ 9.240114] i2c /dev entries driver
[ 9.263847] stmp3xxx_rtc_wdt stmp3xxx_rtc_wdt: initialized watchdog with heartbeat 19s
[ 9.280220] mxs-mmc 80010000.spi: Got WP GPIO
[ 9.316784] mxs-mmc 80010000.spi: initialized
[ 9.375456] mmc0: new high speed SDHC card at address 0007
[ 9.386819] usbcore: registered new interface driver usbhid
[ 9.392495] usbhid: USB HID core driver
[ 9.403055] mmcblk0: mmc0:0007 SD16G 14.5 GiB
[ 9.452132] mmcblk0: p1 p2 p3
[ 9.463335] imx28-pinctrl 80018000.pinctrl: pin SAIF0_MCLK already requested by leds; cannot claim for 80042000.saif
[ 9.474274] imx28-pinctrl 80018000.pinctrl: pin-116 (80042000.saif) status -22
[ 9.481850] imx28-pinctrl 80018000.pinctrl: could not request pin 116 (SAIF0_MCLK) from group saif0.0 on device 80018000.pinctrl
[ 9.493821] mxs-saif 80042000.saif: Error applying setting, reverse things back
[ 9.523013] mxs-saif: probe of 80042000.saif failed with error -22
[ 9.534272] mxs-sgtl5000 sound: failed to get mclk
[ 9.539583] mxs-sgtl5000: probe of sound failed with error -22
[ 9.547234] NET: Registered protocol family 17
[ 9.552400] Key type dns_resolver registered
[ 9.560733] registered taskstats version 1
[ 9.712756] stmp3xxx-rtc 80056000.rtc: setting system clock to 1970-01-01T13:08:19 UTC (47299)
[ 9.723350] ALSA device list:
[ 9.727181] No soundcards found.
[ 9.737929] uart-pl011 80074000.serial: no DMA platform data
[ 9.998528] EXT4-fs (mmcblk0p3): recovery complete
[ 10.021308] EXT4-fs (mmcblk0p3): mounted filesystem with ordered data mode. Opts: (null)
[ 10.030344] VFS: Mounted root (ext4 filesystem) on device 179:3.
[ 10.042110] devtmpfs: mounted
[ 10.047675] Freeing unused kernel memory: 324K
[ 10.052218] This architecture does not have kernel memory protection.
[ 10.058981] Run /sbin/init as init process
[ 10.418092] EXT4-fs (mmcblk0p3): re-mounted. Opts: (null)
mount: mounting /dev/mmcblk0p1 on /mnt/sdcard failed: Invalid argument
Starting syslogd: OK
Starting klogd: OK
Running sysctl: OK
Starting mdev... OK
modprobe: can't change directory to '/lib/modules': No such file or directory
Initializing random number generator: OK
Saving random seed: [ 15.269711] random: dd: uninitialized urandom read (512 bytes read)
OK
Starting network: [ 16.079916] Generic PHY 800f0000.ethernet-1:05: attached PHY driver [Generic PHY] (mii_bus:phy_addr=800f0000.ethernet-1:05, irq=POLL)
OK
Starting ntpd: OK
Welcome to EasyArm-i.MX280a
EasyArm-i.MX280a login: [ 19.228436] fec 800f0000.ethernet eth0: Link is Up - 100Mbps/Full - flow control off
[ 40.266980] lcd-3v3: disabling
[ 40.270673] can-3v3: disabling
[ 40.273856] lcd-5v: disabling
[ 164.826088] random: crng init done
Welcome to EasyArm-i.MX280a
EasyArm-i.MX280a login: root
Password:
# cat /proc/version
Linux version 5.5.5-g7070cea-dirty (wnavy@wnavy-vm) (gcc version 9.2.0 (crosstool-NG 1.24.0.105_5659366)) #1 Tue Jul 7 00:38:11 CST 2020
# cat /proc/cpuinfo
processor : 0
model name : ARM926EJ-S rev 5 (v5l)
BogoMIPS : 226.09
Features : swp half thumb fastmult edsp java
CPU implementer : 0x41
CPU architecture: 5TEJ
CPU variant : 0x0
CPU part : 0x926
CPU revision : 5
Hardware : Freescale MXS (Device Tree)
Revision : 0000
Serial : 0000000000000000
# top
Mem: 21708K used, 26160K free, 40K shrd, 304K buff, 4712K cached
CPU: 0% usr 28% sys 0% nic 71% idle 0% io 0% irq 0% sirq
Load average: 0.02 0.06 0.02 1/39 145
PID PPID USER STAT VSZ %VSZ %CPU COMMAND
145 141 root R 2640 5% 29% top
139 1 root S 5384 11% 0% /usr/sbin/ntpd -g
104 1 root S 3028 6% 0% /sbin/mdev -df
141 1 root S 2768 6% 0% -sh
1 0 root S 2640 5% 0% init
88 1 root S 2640 5% 0% /sbin/syslogd -n
92 1 root S 2640 5% 0% /sbin/klogd -n
22 2 root IW 0 0% 0% [kworker/0:1-eve]
70 2 root IW< 0 0% 0% [kworker/0:1H-kb]
7 2 root SW 0 0% 0% [ksoftirqd/0]
5 2 root IW 0 0% 0% [kworker/u2:0-ev]
8 2 root SW 0 0% 0% [kdevtmpfs]
71 2 root SW 0 0% 0% [jbd2/mmcblk0p3-]
2 0 root SW 0 0% 0% [kthreadd]
3 2 root IW 0 0% 0% [kworker/0:0-pm]
4 2 root IW< 0 0% 0% [kworker/0:0H-kb]
6 2 root IW< 0 0% 0% [mm_percpu_wq]
9 2 root SW 0 0% 0% [khungtaskd]
10 2 root SW 0 0% 0% [oom_reaper]
11 2 root IW< 0 0% 0% [writeback]
#