最近碰到一个奇怪的问题，板子上有两个SD卡座，其中TF1接着SD1，不插上SD卡时能正常启动，插着SD开机，总跑到下面这里就死机了
板子原理图如下：
板子(SabreSD,Android4.4.2)启动信息如下：
U-Boot 2009.08-00705-g064ce51-dirty ( 7?.25 2015 - 14:45:07)
CPU: Freescale i.MX6 family TO1.2 at 792 MHz
Thermal sensor with ratio = 172
Temperature: 42 C, calibration data 0x5424a27d
mx6q pll1: 792MHz
mx6q pll2: 528MHz
mx6q pll3: 480MHz
mx6q pll8: 50MHz
ipg clock : 66000000Hz
ipg per clock : 66000000Hz
uart clock : 80000000Hz
cspi clock : 60000000Hz
ahb clock : 132000000Hz
axi clock : 198000000Hz
emi_slow clock: 99000000Hz
ddr clock : 396000000Hz
usdhc1 clock : 198000000Hz
usdhc2 clock : 198000000Hz
usdhc3 clock : 198000000Hz
usdhc4 clock : 198000000Hz
nfc clock : 24000000Hz
Board: i.MX6DL/Solo-SABRESD: unknown-board Board: 0x61012 [POR ]
Boot Device: MMC
I2C: ready
DRAM: 1 GB
MMC: FSL_ESDHC: 0,FSL_ESDHC: 1,FSL_ESDHC: 2,FSL_ESDHC: 3
*** Warning - bad CRC or MMC, using default environment
Error: no valid bmp image at 30000000
mxcfb: Error initializing panel.
In: serial
Out: serial
Err: serial
reading update_guide_file
## Unable to get update guide update_guide_file from MMC-MEDIA:1 Card did not respond to voltage select!
MMC2 card init failed!
## normal startup!
i2c: I2C1 SDA is low, start i2c recovery...
I2C1 Recovery success
Recovery key pressed
Recovery command file founded!
recovery on bootdev: 7
setup env for recovery..
Net: got MAC address from IIM: 00:00:00:00:00:00
FEC0 [PRIME]
Hit any key to stop autoboot: 0
kernel @ 10808000 (4843080)
ramdisk @ 11800000 (1050917)
kernel cmdline:
use boot.img command line:
console=ttymxc0,115200 init=/init video=mxcfb0:dev=ldb,bpp=32 video=mxcfb1:off video=mxcfb2:off fbmem=10M fb0base=0x27b00000 vmalloc=400M androidboot.console=ttymxc0 androidboot.hardware=freescale androidboot.serialno=0e0e31d4e302a50e
Starting kernel ...
Uncompressing Linux... done, booting the kernel.
Initializing cgroup subsys cpu
Linux version 3.0.35-06497-gcc45965 (robin@robin-virtual-machine) (gcc version 4.6.x-google 20120106 (prerelease) (GCC) ) #1 SMP PREEMPT Sat May 16 17:57:16 CST 2015
CPU: ARMv7 Processor [412fc09a] revision 10 (ARMv7), cr=10c53c7d
CPU: VIPT nonaliasing data cache, VIPT aliasing instruction cache
Machine: Freescale i.MX 6Quad/DualLite/Solo Sabre-SD Board
Ignoring unrecognised tag 0x54410008
Memory policy: ECC disabled, Data cache writealloc
CPU identified as i.MX6DL/SOLO, silicon rev 1.2
PERCPU: Embedded 7 pages/cpu @c133e000 s6528 r8192 d13952 u32768
Built 1 zonelists in Zone order, mobility grouping on. Total pages: 208128
Kernel command line: console=ttymxc0,115200 init=/init video=mxcfb0:dev=ldb,bpp=32 video=mxcfb1:off video=mxcfb2:off fbmem=10M fb0base=0x27b00000 vmalloc=400M androidboot.console=ttymxc0 androidboot.hardware=freescale androidboot.serialno=0e0e31d4e302a50e
PID hash table entries: 2048 (order: 1, 8192 bytes)
Dentry cache hash table entries: 65536 (order: 6, 262144 bytes)
Inode-cache hash table entries: 32768 (order: 5, 131072 bytes)
Memory: 379MB 378MB 64MB = 821MB total
Memory: 819512k/819512k available, 229064k reserved, 441344K highmem
Virtual kernel memory layout:
vector : 0xffff0000 - 0xffff1000 ( 4 kB)
fixmap : 0xfff00000 - 0xfffe0000 ( 896 kB)
DMA : 0xfbe00000 - 0xffe00000 ( 64 MB)
vmalloc : 0xd9800000 - 0xf2000000 ( 392 MB)
lowmem : 0xc0000000 - 0xd9000000 ( 400 MB)
pkmap : 0xbfe00000 - 0xc0000000 ( 2 MB)
modules : 0xbf000000 - 0xbfe00000 ( 14 MB)
.init : 0xc0008000 - 0xc0047000 ( 252 kB)
.text : 0xc0047000 - 0xc0910584 (8998 kB)
.data : 0xc0912000 - 0xc09ac470 ( 618 kB)
.bss : 0xc09ac494 - 0xc0b34fbc (1571 kB)
Preemptible hierarchical RCU implementation.
NR_IRQS:624
MXC GPIO hardware
sched_clock: 32 bits at 3000kHz, resolution 333ns, wraps every 1431655ms
Set periph_clk's parent to pll2_pfd_400M!
arm_max_freq=800MHz
MXC_Early serial console at MMIO 0x2020000 (options '115200')
bootconsole [ttymxc0] enabled
Calibrating delay loop... 1581.05 BogoMIPS (lpj=7905280)
pid_max: default: 32768 minimum: 301
Security Framework initialized
SELinux: Initializing.
Mount-cache hash table entries: 512
Initializing cgroup subsys debug
Initializing cgroup subsys cpuacct
Initializing cgroup subsys freezer
CPU: Testing write buffer coherency: ok
hw perfevents: enabled with ARMv7 Cortex-A9 PMU driver, 7 counters available
CPU1: Booted secondary processor
Brought up 2 CPUs
SMP: Total of 2 processors activated (3162.11 BogoMIPS).
print_constraints: dummy:
NET: Registered protocol family 16
print_constraints: vddpu: 725 <--> 1300 mV at 700 mV fast normal
print_constraints: vddcore: 725 <--> 1300 mV at 1150 mV fast normal
print_constraints: vddsoc: 725 <--> 1300 mV at 1200 mV fast normal
print_constraints: vdd2p5: 2000 <--> 2775 mV at 2400 mV fast normal
print_constraints: vdd1p1: 800 <--> 1400 mV at 1100 mV fast normal
print_constraints: vdd3p0: 2625 <--> 3400 mV at 3000 mV fast normal
ram_console: got buffer at 3ff00000, size 100000
ram_console: uncorrectable error in header
ram_console: no valid data in buffer (sig = 0x60400108)
console [ram-1] enabled
hw-breakpoint: found 6 breakpoint and 1 watchpoint registers.
hw-breakpoint: 1 breakpoint(s) reserved for watchpoint single-step.
hw-breakpoint: maximum watchpoint size is 4 bytes.
L310 cache controller enabled
l2x0: 16 ways, CACHE_ID 0x410000c8, AUX_CTRL 0x32050000, Cache size: 524288 B
bio: create slab <bio-0> at 0
mxs-dma mxs-dma-apbh: initialized
print_constraints: SPKVDD: 4200 mV
print_constraints: vmmc: 3300 mV
vgaarb: loaded
SCSI subsystem initialized
spi_imx imx6q-ecspi.0: probed
usbcore: registered new interface driver usbfs
usbcore: registered new interface driver hub
usbcore: registered new device driver usb
Freescale USB OTG Driver loaded, $Revision: 1.55 $
mc_pfuze 1-0008: recv failed!:-5,0
mc_pfuze: probe of 1-0008 failed with error -1
mxc_mipi_csi2 mxc_mipi_csi2: i.MX MIPI CSI2 driver probed
mxc_mipi_csi2 mxc_mipi_csi2: i.MX MIPI CSI2 dphy version is 0x3130302a
MIPI CSI2 driver module loaded
Advanced Linux Sound Architecture Driver Version 1.0.24.
Bluetooth: Core ver 2.16
NET: Registered protocol family 31
Bluetooth: HCI device and connection manager initialized
Bluetooth: HCI socket layer initialized
Bluetooth: L2CAP socket layer initialized
Bluetooth: SCO socket layer initialized
max17135_regulator_init abort: EPDC not enabled
max17135 2-0048: PMIC MAX17135 for eInk display
i2c-core: driver [max17135] using legacy suspend method
i2c-core: driver [max17135] using legacy resume method
Switching to clocksource mxc_timer1
NET: Registered protocol family 2
IP route cache hash table entries: 16384 (order: 4, 65536 bytes)
TCP established hash table entries: 65536 (order: 7, 524288 bytes)
TCP bind hash table entries: 65536 (order: 7, 786432 bytes)
TCP: Hash tables configured (established 65536 bind 65536)
TCP reno registered
UDP hash table entries: 256 (order: 1, 8192 bytes)
UDP-Lite hash table entries: 256 (order: 1, 8192 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.
PCI: CLS 0 bytes, default 32
Unpacking initramfs...
Freeing initrd memory: 1024K
PMU: registered new PMU device of type 0
Static Power Management for Freescale i.MX6
wait mode is enabled for i.MX6
cpaddr = d9820000 suspend_iram_base=d98b4000
PM driver module loaded
iMX6 PCIe PCIe RC mode imx_pcie_pltfm_probe entering. （每次都是跑到这就死机了）
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