sd卡启动的问题
换回16g sd卡后烧录系统，打印如下：[ 2.778201] oprofile: hardware counters not available
[ 2.783489] oprofile: using timer interrupt.
[ 2.787961] Netfilter messages via NETLINK v0.30.
[ 2.792991] nf_conntrack version 0.5.0 (8005 buckets, 32020 max)
[ 2.799734] ctnetlink v0.93: registering with nfnetlink.
[ 2.806284] xt_time: kernel timezone is -0000
[ 2.811082] ip_tables: (C) 2000-2006 Netfilter Core Team
[ 2.816872] ipt_CLUSTERIP: ClusterIP Version 0.8 loaded successfully
[ 2.823590] arp_tables: (C) 2002 David S. Miller
[ 2.828495] TCP cubic registered
[ 2.831882] NET: Registered protocol family 17
[ 2.836525] can: controller area network core (rev 20090105 abi 8)
[ 2.843098] NET: Registered protocol family 29
[ 2.847759] can: raw protocol (rev 20090105)
[ 2.852233] can: broadcast manager protocol (rev 20090105 t)
[ 2.858178] Registering the dns_resolver key type
[ 2.863163] VFP support v0.3: implementor 41 architecture 3 part 30 variant c rev 3
[ 2.871166] ThumbEE CPU extension supported.
[ 2.875697] mux: Failed to setup hwmod io irq -22
[ 2.881296] Power Management for AM33XX family
[ 2.886183] Trying to load am335x-pm-firmware.bin (60 secs timeout)
[ 2.892868] Copied the M3 firmware to UMEM
[ 2.897220] Cortex M3 Firmware Version = 0x181
[ 2.910281] clock: disabling unused clocks to save power
[ 2.918239] Detected MACID=f8:36:9b:89:c2:c4
[ 2.923987] cpsw: Detected MACID = f8:36:9b:89:c2:c6
[ 2.931422] input: gpio-keys as /devices/platform/gpio-keys/input/input1
[ 2.941348] rtc-rx8010 2-0032: setting system clock to 2020-04-14 15:33:19 UTC (1586878399)
[ 2.955006] EXT3-fs (mmcblk0p2): recovery required on readonly filesystem
[ 2.962133] EXT3-fs (mmcblk0p2): write access will be enabled during recovery
[ 2.971715] kjournald starting.Commit interval 5 seconds
[ 2.977498] EXT3-fs (mmcblk0p2): recovery complete
[ 3.092425] EXT3-fs (mmcblk0p2): mounted filesystem with ordered data mode
[ 3.099661] VFS: Mounted root (ext3 filesystem) readonly on device 179:2.
[ 3.107854] devtmpfs: error mounting -2
[ 3.112263] Freeing init memory: 256K
[ 4.309931] EXT3-fs (mmcblk0p2): using internal journal
一直卡在这个位置。
重启一下试试，看这个打印信息看不出错误 我发现rootfs这个分区不用root权限是无法在里面创建文件的，这个正常吗 [ 2.628923] OMAP Watchdog Timer Rev 0x01: initial timeout 60 sec
[ 2.636675] cpuidle: using governor ladder
[ 2.641435] cpuidle: using governor menu
[ 2.652386] usbcore: registered new inte**ce driver usbhid
[ 2.658214] usbhid: USB HID core driver
[ 2.663209] tiadc tiadc: attached adc driver
[ 2.670459] _regulator_get: 2-001b supply IOVDD not found, using dummy regulator
[ 2.678300] _regulator_get: 2-001b supply DVDD not found, using dummy regulator
[ 2.685984] _regulator_get: 2-001b supply AVDD not found, using dummy regulator
[ 2.693656] _regulator_get: 2-001b supply DRVDD not found, using dummy regulator
[ 2.704329] asoc: tlv320aic3x-hifi <-> davinci-mcasp.1 mapping ok
[ 2.742484] mmc0: host does not support reading read-only switch. assuming write-enable.
[ 2.752748] mmc0: new high speed SDHC card at address 0007
[ 2.759215] mmcblk0: mmc0:0007 Y016B 14.9 GiB
[ 2.765508]mmcblk0: p1 p2
[ 2.771981] ALSA device list:
[ 2.775096] #0: AM335X EVM
[ 2.778095] oprofile: hardware counters not available
[ 2.783383] oprofile: using timer interrupt.
[ 2.787857] Netfilter messages via NETLINK v0.30.
[ 2.792884] nf_conntrack version 0.5.0 (8005 buckets, 32020 max)
[ 2.799626] ctnetlink v0.93: registering with nfnetlink.
[ 2.806174] xt_time: kernel timezone is -0000
[ 2.810976] ip_tables: (C) 2000-2006 Netfilter Core Team
[ 2.816773] ipt_CLUSTERIP: ClusterIP Version 0.8 loaded successfully
[ 2.823488] arp_tables: (C) 2002 David S. Miller
[ 2.828391] TCP cubic registered
[ 2.831778] NET: Registered protocol family 17
[ 2.836419] can: controller area network core (rev 20090105 abi 8)
[ 2.842984] NET: Registered protocol family 29
[ 2.847646] can: raw protocol (rev 20090105)
[ 2.852120] can: broadcast manager protocol (rev 20090105 t) 正常，根目录就是root权限的
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