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我用的是TTL的方法转USB可以通信，但是板子一直重启，没有办法起来系统？求各位大神指教，
出来的是一下这么一堆东西。然后不停的重启。
0Hz bm PP pm ON vdd 3.3V width 1 timing SD-HS(SDR25) dt B
<6>[mmc-msg] sdc0 set round clock 42857143, src 600000000
[mmc-msg] sdc0 set round clock 42857143, src 600000000
<6>[mmc-msg] sdc0 set ios: clk 50000000Hz bm PP pm ON vdd 3.3V width 4 timing SD-HS(SDR25) dt B
[mmc-msg] sdc0 set ios: clk 50000000Hz bm PP pm ON vdd 3.3V width 4 timing SD-HS(SDR25) dt B
<6>mmc0: new high speed SDHC card at address 0007
mmc0: new high speed SDHC card at address 0007
<6>mmcblk0: mmc0:0007 SL16G 14.4 GiB
mmcblk0: mmc0:0007 SL16G 14.4 GiB
<6> mmcblk0: p1
mmcblk0: p1
<6>[mmc-msg] sdc2 set ios: clk 0Hz bm PP pm UP vdd 3.3V width 1 timing LEGACY(SDR12) dt B
[mmc-msg] sdc2 set ios: clk 0Hz bm PP pm UP vdd 3.3V width 1 timing LEGACY(SDR12) dt B
<6>[mmc-msg] sdc2 power on
[mmc-msg] sdc2 power on
<6>[mmc-msg] sdc2 set ios: clk 400000Hz bm PP pm ON vdd 3.3V width 1 timing LEGACY(SDR12) dt B
[mmc-msg] sdc2 set ios: clk 400000Hz bm PP pm ON vdd 3.3V width 1 timing LEGACY(SDR12) dt B
<6>[mmc-msg] sdc2 set round clock 400000, src 24000000
[mmc-msg] sdc2 set rouVnd clock 400000, src 24000000
FS: Cannot open root device "mmcblk0p2" or unknown-block(179,2): error -6
Please append a correct "root=" boot optionVFS: Cannot open root device "mmcblk0p2" or unknown-block(179,2): error -6
; here are the available partitions:
b300 15159296 mmcblk0 driver: mmcblPlease append a correct "root=" boot option; here are the available partitions:
k
b301 15155200 mmcblk0p1 00000000-00b300 15159296 mmcblk0 driver: mmcblk
00-0000-0000-000000000000
b301 15155200 mmcblk0p1 00000000-0000-0000-0000-000000000000<0>Kernel panic - not syncing: VFS: Unable t
o mount root fs on unknown-block(179,2)
[<c0014f14>] (unwind_backtrace+0x0/0x138) from Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(179,2)
[<c0594450>] (panic+0x8c/0x1cc)
[<c0594450>] (panic+0x8c/0x1cc) from [<c07f8dac>][<c0014f14>] (unwind_backtrace+0x0/0x138) from [<c0594450>] (panic+0x8c/0x1cc)
(mount_block_root+0x184/0x254)
[<c07f8dac>] (mount_block_root+0x184/0x254) from [<[<c0594450>] (panic+0x8c/0x1cc) from [<c07f8dac>] (mount_block_root+0x184/0x254)
c07f9078>] (mount_root+0xe8/0x108)
[<c07f9078>] (mount_root+0xe8/0x108) from [<c07f91f8[<c07f8dac>] (mount_block_root+0x184/0x254) from [<c07f9078>] (mount_root+0xe8/0x108)
>] (prepare_namespace+0x160/0x1c4)
[<c07f91f8>] (prepare_namespace+0x160/0x1c4) from [<c[<c07f9078>] (mount_root+0xe8/0x108) from [<c07f91f8>] (prepare_namespace+0x160/0x1c4)
07f8a50>] (kernel_init+0x1d4/0x218)
[<c07f8a50>] (kernel_init+0x1d4/0x218) from [<c000f51[<c07f91f8>] (prepare_namespace+0x160/0x1c4) from [<c07f8a50>] (kernel_init+0x1d4/0x218)
c>] (kernel_thread_exit+0x0/0x8)
[<c07f8a50>] (kernel_init+0x1d4/0x218) from [<c000f51c>] (kernel_thread_exit+0x0/0x8)
<2>CPU0: stopping
CPU0: stopping
[<c0014f14>] (unwind_backtrace+0x0/0x138) from [<c0013a74>] (handle_IPI+0x198/0x1cc)
[<c0014f14>] (unwind_backtrace+0x0/0x138) from [<c0013a74>] (handle_IPI+0x198/0x1cc)
[<c0013a74>] (handle_IPI+0x198/0x1cc) from [<c0008504>] (gic_handle_irq+0x50/0x58)
[<c0013a74>] (handle_IPI+0x198/0x1cc) from [<c0008504>] (gic_handle_irq+0x50/0x58)
[<c0008504>] (gic_handle_irq+0x50/0x58) from [<c000e600>] (__irq_svc+0x40/0x70)
[<c0008504>] (gic_handle_irq+0x50/0x58) from [<c000e600>] (__irq_svc+0x40/0x70)
Exception stack(0xef05bd58 to 0xef05bda0)
Exception stack(0xef05bd58 to 0xef05bda0)
bd40: 00000000 60000093
bd40: 00000000 60000093
bd60: 271ae953 271ae953 c08abb6a c08abb9e c084a6b4 0000003a 00000000 10624dd3
bd60: 271ae953 271ae953 c08abb6a c08abb9e c084a6b4 0000003a 00000000 10624dd3
bd80: 60000013 60000013 c08414c8 ef05bda0 c00396e4 c0039be4 60000013 ffffffff
bd80: 60000013 60000013 c08414c8 ef05bda0 c00396e4 c0039be4 60000013 ffffffff
[<c000e600>] (__irq_svc+0x40/0x70) from [<c0039be4>] (vprintk+0x3a4/0x5f8)
[<c000e600>] (__irq_svc+0x40/0x70) from [<c0039be4>] (vprintk+0x3a4/0x5f8)
[<c0039be4>] (vprintk+0x3a4/0x5f8) from [<c05945ac>] (printk+0x1c/0x2c)
[<c0039be4>] (vprintk+0x3a4/0x5f8) from [<c05945ac>] (printk+0x1c/0x2c)
[<c05945ac>] (printk+0x1c/0x2c) from [<c042fe5c>] (sw_mci_set_clk+0xb0/0x250)
[<c05945ac>] (printk+0x1c/0x2c) from [<c042fe5c>] (sw_mci_set_clk+0xb0/0x250)
[<c042fe5c>] (sw_mci_set_clk+0xb0/0x250) from [<c04302b0>] (sw_mci_set_ios+0x2b4/0x564)
[<c042fe5c>] (sw_mci_set_clk+0xb0/0x250) from [<c04302b0>] (sw_mci_set_ios+0x2b4/0x564)
[<c04302b0>] (sw_mci_set_ios+0x2b4/0x564) from [<c04209ec>] (mmc_power_up+0xc8/0x170)
[<c04302b0>] (sw_mci_set_ios+0x2b4/0x564) from [<c04209ec>] (mmc_power_up+0xc8/0x170)
[<c04209ec>] (mmc_power_up+0xc8/0x170) from [<c0422034>] (mmc_rescan+0x220/0x2e0)
[<c04209ec>] (mmc_power_up+0xc8/0x170) from [<c0422034>] (mmc_rescan+0x220/0x2e0)
[<c0422034>] (mmc_rescan+0x220/0x2e0) from [<c004e1a4>] (process_one_work+0x118/0x384)
[<c0422034>] (mmc_rescan+0x220/0x2e0) from [<c004e1a4>] (process_one_work+0x118/0x384)
[<c004e1a4>] (process_one_work+0x118/0x384) from [<c004e788>] (worker_thread+0x174/0x374)
[<c004e1a4>] (process_one_work+0x118/0x384) from [<c004e788>] (worker_thread+0x174/0x374)
[<c004e788>] (worker_thread+0x174/0x374) from [<c0052d88>] (kthread+0x84/0x90)
[<c004e788>] (worker_thread+0x174/0x374) from [<c0052d88>] (kthread+0x84/0x90)
[<c0052d88>] (kthread+0x84/0x90) from [<c000f51c>] (kernel_thread_exit+0x0/0x8)
[<c0052d88>] (kthread+0x84/0x90) from [<c000f51c>] (kernel_thread_exit+0x0/0x8)
<3>[hotplug]: try to kill cpu:0 failed!
[hotplug]: try to kill cpu:0 failed!
<0>Rebooting in 10 seconds..Rebooting in 10 seconds..
U-Boot SPL 2014.01-rc1-09165-gb4590df-dirty (May 09 2014 - 15:40:36)
Board: Cubieboard2
dram: 1024 MiB
CPU: 960000000Hz, AXI/AHB/APB: 3/2/2
spl: not an uImage at 1600
U-Boot 2014.01-rc1-09165-gb4590df-dirty (May 09 2014 - 15:40:36) Allwinner Technology
CPU: Allwinner A20 (SUN7I)
Board: Cubieboard2
I2C: ready
DRAM: 1 GiB
WARNING: Caches not enabled
MMC: SUNXI SD/MMC: 0
*** Warning - bad CRC, using default environment
In: serial
Out: serial
Err: serial
Net: mii0
Warning: failed to set MAC address
Hit any key to stop autoboot: 0
sun7i#
sun7i#
sun7i#
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发表于 2015-12-8 19:37:48
发表于 2015-12-9 09:34:24