自己做的SD卡启动分区分了三部分：
mmcblk1boot0 179:8 0 16M 1 disk
mmcblk1boot1 179:16 0 16M 1 disk
mmcblk0 179:24 0 3.7G 0 disk
├─mmcblk0p1 179:25 0 62.8M 0 part
├─mmcblk0p2 179:26 0 1G 0 part
└─mmcblk0p3 179:27 0 2.6G 0 part
mmcblk1 179:0 0 3.6G 0 disk
└─mmcblk1p1 179:1 0 3.6G 0 part /
ubuntu@arm:~$
第一部分放：
u-boot.img MLO uImage zImage
第二部分放文件系统
第三部分未用
这个制作好的SD卡可以在Am335x-evm-sk上使用正常启动，但是在BeagleBone black却不能正常启动时什么原因？
启动调试信息：
U-Boot SPL 2016.03 (Oct 16 2017 - 19:22:35)
preloader_console_init()
>>spl:SDRAM_init()
>>spl:board_init_r()
MAIN_OSC: 24Mhz
DPLL_Mpu_Freq: 300MHz
DPLL_Core_Freq: 100MHz
DPLL_Per_Freq_usb_phy_clk: 960MHz
DPLL_Per_Freq_PRU_ICSS_Uart_moduclk: 192MHz
DPLL_Per_Freq_MMC_moduclk: 96MHz
DPLL_Per_Freq_SPI_moduclk: 48MHz
DPLL_Per_Freq_UART_moduclk: 48MHz
DPLL_Per_Freq_I2C_moduclk: 48MHz
This is sure,only I think
/arch/arm/cpu/armv7/omap-common/save_omap_boot_params
/arch/arm/cpu/armv7/omap-common/gpmc_init
/arch/arm/cpu/armv7/omap-common/i2c_init
/arch/arm/cpu/armv7/omap-common/arch_misc_init()
/arch/arm/cpu/armv7/omap-common/hw_watchdog_init()
/arch/arm/cpu/armv7/omap-common/am33xx_spl_board_init()
Trying to boot from MMC
MMC->xxxx/drivers/mmc/mmc.c2
reading args
spl_load_image_fat_os: error reading image args, err - -1
reading u-boot.img
reading u-boot.img
U-Boot 2016.03 (Oct 16 2017 - 19:22:35 +0800)
U-Boot code: 80800000 -> 808DA324 BSS_END: -> 80926BBC
Watchdog enabled
I2C: ready
DRAM: 512 MiB
NAND: 0 MiB
nand_init->xxxx/drivers/mtd/nand/nand.c
MMC: OMAP SD/MMC: 0, OMAP SD/MMC: 1
MMC->xxxx/drivers/mmc/mmc.c1
MMC->xxxx/drivers/mmc/mmc.c2
xxxx/common/env_common.c
*** Error - No Valid Environment Area found
*** Warning - bad CRC, using default environment
xxxx/common/env_common.c
Net: xxx/board/ti/am335x/board_eth_init--->,6be7
xxx/board/ti/am335x/board_eth_init--->,5fab5ef4
<ethaddr> not set. Validating first E-fuse MAC
Here at xxx/drivers/net/cpsw.c
phy_reg---> 3000
phy_reg---> 7809
phy_reg---> 7
phy_reg---> c0f1
phy_reg---> 1e1
phy_reg---> 1
phy_reg---> 0
phy_reg---> ffff
phy_reg---> ffff
phy_reg---> ffff
phy_reg---> ffff
phy_reg---> ffff
phy_reg---> ffff
phy_reg---> ffff
phy_reg---> ffff
phy_reg---> 0
phy_reg---> 40
phy_reg---> 2
phy_reg---> e0
phy_reg---> ffff
phy_reg---> 0
phy_reg---> 0
phy_reg---> 0
phy_reg---> 0
phy_reg---> ffff
phy_reg---> ffff
phy_reg---> 0
phy_reg---> 0
phy_reg---> 0
phy_reg---> 90
phy_reg---> 0
phy_reg---> 40
End
xxx/Board/Ti/Am335x/Board.c:---->Ethernet_init
maria: ----> 40070106
maria: ----> 410000ff
maria: ----> 1
maria: ----> 0
maria: ----> 0
maria: ----> 0
maria: ----> 1
maria: ----> 0
maria: ----> 0
maria: ----> 0
maria: ----> 23e00040
maria: ----> 0
maria: ----> 0
maria: ----> 0
xxx/Board/Ti/Am335x/Board.c:---->Ethernet_init
cpsw, usb_ether
NET: -> xxxx/net/eth_legacy.c
Press SPACE to abort autoboot in 5 seconds
## Error: "envboot" not defined
lcd reset
switch to partitions #0, OK
mmc0 is current device
Scanning mmc 0:1...
switch to partitions #0, OK
mmc0 is current device
SD/MMC found on device 0
reading boot.scr
** Unable to read file boot.scr **
reading uEnv.txt
133 bytes read in 4 ms (32.2 KiB/s)
Loaded environment from uEnv.txt
Importing environment from mmc ...
Running uenvcmd ...
reading uImage
4287776 bytes read in 391 ms (10.5 MiB/s)
reading zyr-am335x-evmsk.dtb
32012 bytes read in 15 ms (2 MiB/s)
## Booting kernel from Legacy Image at 82000000 ...
Image Name: Linux-3.14.65
Created: 2017-06-12 5:13:43 UTC
Image Type: ARM Linux Kernel Image (uncompressed)
Data Size: 4287712 Bytes = 4.1 MiB
Load Address: 80008000
Entry Point: 80008000
Verifying Checksum ... OK
## Flattened Device Tree blob at 83000000
Booting using the fdt blob at 0x83000000
Loading Kernel Image ... OK
Loading Device Tree to 8fff5000, end 8ffffd0b ... OK
Starting kernel ...
[ 0.000000] Booting Linux on physical CPU 0x0
[ 0.000000] Linux version 3.14.65 (zyr@ubuntu) (gcc version 4.6.3 (Ubuntu/Linar o 4.6.3-1ubuntu5) ) #1 SMP Mon Jun 12 12:35:16 CST 2017
[ 0.000000] CPU: ARMv7 Processor [413fc082] revision 2 (ARMv7), cr=10c5387d
[ 0.000000] CPU: PIPT / VIPT nonaliasing data cache, VIPT aliasing instruction cache
[ 0.000000] Machine model: TI AM335x EVM-SK
[ 0.000000] cma: CMA: reserved 16 MiB at 9e800000
[ 0.000000] Memory policy: Data cache writeback
[ 0.000000] CPU: All CPU(s) started in SVC mode.
[ 0.000000] AM335X ES2.1 (sgx neon )
[ 0.000000] PERCPU: Embedded 9 pages/cpu @dfad4000 s13184 r8192 d15488 u36864
[ 0.000000] Built 1 zonelists in Zone order, mobility grouping on. Total pages : 129792
[ 0.000000] Kernel command line: root=/dev/mmcblk0p2 rootwait console=ttyO0,115 200
[ 0.000000] PID hash table entries: 2048 (order: 1, 8192 bytes)
[ 0.000000] Dentry cache hash table entries: 65536 (order: 6, 262144 bytes)
[ 0.000000] Inode-cache hash table entries: 32768 (order: 5, 131072 bytes)
[ 0.000000] Memory: 487848K/523264K available (5629K kernel code, 655K rwdata, 2132K rodata, 384K init, 5518K bss, 35416K reserved, 0K highmem)
[ 0.000000] Virtual kernel memory layout:
[ 0.000000] vector : 0xffff0000 - 0xffff1000 ( 4 kB)
[ 0.000000] fixmap : 0xfff00000 - 0xfffe0000 ( 896 kB)
[ 0.000000] vmalloc : 0xe0800000 - 0xff000000 ( 488 MB)
[ 0.000000] lowmem : 0xc0000000 - 0xe0000000 ( 512 MB)
[ 0.000000] pkmap : 0xbfe00000 - 0xc0000000 ( 2 MB)
[ 0.000000] modules : 0xbf000000 - 0xbfe00000 ( 14 MB)
[ 0.000000] .text : 0xc0008000 - 0xc079c71c (7762 kB)
[ 0.000000] .init : 0xc079d000 - 0xc07fd380 ( 385 kB)
[ 0.000000] .data : 0xc07fe000 - 0xc08a1e18 ( 656 kB)
[ 0.000000] .bss : 0xc08a1e18 - 0xc0e05968 (5519 kB)
[ 0.000000] Hierarchical RCU implementation.
[ 0.000000] RCU restricting CPUs from NR_CPUS=2 to nr_cpu_ids=1.
[ 0.000000] RCU: Adjusting geometry for rcu_fanout_leaf=16, nr_cpu_ids=1
[ 0.000000] NR_IRQS:16 nr_irqs:16 16
[ 0.000000] IRQ: Found an INTC at 0xfa200000 (revision 5.0) with 128 interrupts
[ 0.000000] Total of 128 interrupts on 1 active controller
[ 0.000000] OMAP clockevent source: timer2 at 24000000 Hz
[ 0.000010] sched_clock: 32 bits at 24MHz, resolution 41ns, wraps every 1789569 69942ns
[ 0.000055] OMAP clocksource: timer1 at 24000000 Hz
[ 0.000818] Console: colour dummy device 80x30
[ 0.000871] Lock dependency validator: Copyright (c) 2006 Red Hat, Inc., Ingo M olnar
[ 0.000879] ... MAX_LOCKDEP_SUBCLASSES: 8
[ 0.000887] ... MAX_LOCK_DEPTH: 48
[ 0.000894] ... MAX_LOCKDEP_KEYS: 8191
[ 0.000901] ... CLASSHASH_SIZE: 4096
[ 0.000908] ... MAX_LOCKDEP_ENTRIES: 16384
[ 0.000915] ... MAX_LOCKDEP_CHAINS: 32768
[ 0.000922] ... CHAINHASH_SIZE: 16384
[ 0.000930] memory used by lock dependency info: 3695 kB
[ 0.000937] per task-struct memory footprint: 1152 bytes
[ 0.000980] Calibrating delay loop... 996.14 BogoMIPS (lpj=4980736)
[ 0.079153] pid_max: default: 32768 minimum: 301
[ 0.079511] Security Framework initialized
[ 0.079624] Mount-cache hash table entries: 1024 (order: 0, 4096 bytes)
[ 0.079637] Mountpoint-cache hash table entries: 1024 (order: 0, 4096 bytes)
[ 0.098616] CPU: Testing write buffer coherency: ok
[ 0.099959] CPU0: thread -1, cpu 0, socket -1, mpidr 0
[ 0.100031] Setting up static identity map for 0x80556c28 - 0x80556c98
[ 0.102994] Brought up 1 CPUs
[ 0.103014] SMP: Total of 1 processors activated (996.14 BogoMIPS).
[ 0.103024] CPU: All CPU(s) started in SVC mode.
[ 0.105719] devtmpfs: initialized
[ 0.115227] VFP support v0.3: implementor 41 architecture 3 part 30 variant c r ev 3
[ 0.149938] omap_hwmod: tptc0 using broken dt data from edma
[ 0.150292] omap_hwmod: tptc1 using broken dt data from edma
[ 0.150632] omap_hwmod: tptc2 using broken dt data from edma
[ 0.158277] omap_hwmod: debugss: _wait_target_disable failed
[ 0.217074] pinctrl core: initialized pinctrl subsystem
[ 0.221344] regulator-dummy: no parameters
[ 0.224651] NET: Registered protocol family 16
[ 0.229775] DMA: preallocated 256 KiB pool for atomic coherent allocations
[ 0.247475] platform 49000000.edma: alias fck already exists
[ 0.247514] platform 49000000.edma: alias fck already exists
[ 0.247532] platform 49000000.edma: alias fck already exists
[ 0.251781] OMAP GPIO hardware version 0.1
[ 0.281185] No ATAGs?
[ 0.281211] hw-breakpoint: debug architecture 0x4 unsupported.
[ 0.339642] bio: create slab <bio-0> at 0
[ 0.378631] edma-dma-engine edma-dma-engine.0: TI EDMA DMA engine driver
[ 0.380895] vbat: 5000 mV
[ 0.382043] lis3_reg: no parameters
[ 0.388837] SCSI subsystem initialized
[ 0.392242] usbcore: registered new interface driver usbfs
[ 0.392683] usbcore: registered new interface driver hub
[ 0.393425] usbcore: registered new device driver usb
[ 0.396284] omap_i2c 44e0b000.i2c: could not find pctldev for node /pinmux@44e1 0800/pinmux_i2c0_pins, deferring probe
[ 0.396328] platform 44e0b000.i2c: Driver omap_i2c requests probe deferral
[ 0.403461] Switched to clocksource timer1
[ 0.556282] NET: Registered protocol family 2
[ 0.558293] TCP established hash table entries: 4096 (order: 2, 16384 bytes)
[ 0.558476] TCP bind hash table entries: 4096 (order: 5, 147456 bytes)
[ 0.559840] TCP: Hash tables configured (established 4096 bind 4096)
[ 0.559991] TCP: reno registered
[ 0.560016] UDP hash table entries: 256 (order: 2, 20480 bytes)
[ 0.560206] UDP-Lite hash table entries: 256 (order: 2, 20480 bytes)
[ 0.561159] NET: Registered protocol family 1
[ 0.562505] RPC: Registered named UNIX socket transport module.
[ 0.562526] RPC: Registered udp transport module.
[ 0.562535] RPC: Registered tcp transport module.
[ 0.562544] RPC: Registered tcp NFSv4.1 backchannel transport module.
[ 0.563832] hw perfevents: enabled with ARMv7 Cortex-A8 PMU driver, 5 counters available
[ 0.572179] futex hash table entries: 256 (order: 2, 16384 bytes)
[ 0.713326] VFS: Disk quotas dquot_6.5.2
[ 0.713776] Dquot-cache hash table entries: 1024 (order 0, 4096 bytes)
[ 0.715791] NFS: Registering the id_resolver key type
[ 0.716173] Key type id_resolver registered
[ 0.716194] Key type id_legacy registered
[ 0.716313] jffs2: version 2.2. (NAND) (SUMMARY) © 2001-2006 Red Hat, Inc.
[ 0.716726] msgmni has been set to 984
[ 0.719690] io scheduler noop registered
[ 0.719713] io scheduler deadline registered
[ 0.719787] io scheduler cfq registered (default)
[ 0.722742] pinctrl-single 44e10800.pinmux: 142 pins at pa f9e10800 size 568
[ 0.727139] Serial: 8250/16550 driver, 4 ports, IRQ sharing enabled
[ 0.734768] omap_uart 44e09000.serial: no wakeirq for uart0
[ 0.736026] 44e09000.serial: ttyO0 at MMIO 0x44e09000 (irq = 88, base_baud = 30 00000) is a OMAP UART0
[ 1.395813] console [ttyO0] enabled
[ 1.405702] omap_rng 48310000.rng: OMAP Random Number Generator ver. 20
[ 1.442961] brd: module loaded
[ 1.464960] loop: module loaded
[ 1.474411] mtdoops: mtd device (mtddev=name/number) must be supplied
[ 1.489262] usbcore: registered new interface driver asix
[ 1.495915] usbcore: registered new interface driver ax88179_178a
[ 1.502698] usbcore: registered new interface driver cdc_ether
[ 1.509374] usbcore: registered new interface driver smsc95xx
[ 1.516261] usbcore: registered new interface driver net1080
[ 1.522580] usbcore: registered new interface driver cdc_subset
[ 1.529264] usbcore: registered new interface driver zaurus
[ 1.535718] usbcore: registered new interface driver cdc_ncm
[ 1.543884] usbcore: registered new interface driver cdc_wdm
[ 1.550304] usbcore: registered new interface driver usb-storage
[ 1.557154] usbcore: registered new interface driver usbtest
[ 1.566986] mousedev: PS/2 mouse device common for all mice
[ 1.578298] omap_rtc 44e3e000.rtc: rtc core: registered 44e3e000.rtc as rtc0
[ 1.585937] 44e3e000.rtc: already running
[ 1.591466] i2c /dev entries driver
[ 1.595905] Driver for 1-wire Dallas network protocol.
[ 1.606221] omap_wdt: OMAP Watchdog Timer Rev 0x01: initial timeout 60 sec
[ 1.617699] omap_hsmmc 48060000.mmc: vmmc regulator missing
[ 1.624183] platform 48060000.mmc: Driver omap_hsmmc requests probe deferral
[ 1.633908] usbcore: registered new interface driver usbhid
[ 1.639737] usbhid: USB HID core driver
[ 1.646188] oprofile: using arm/armv7
[ 1.650668] TCP: cubic registered
[ 1.654264] Initializing XFRM netlink socket
[ 1.658851] NET: Registered protocol family 17
[ 1.663617] NET: Registered protocol family 15
[ 1.668591] Key type dns_resolver registered
[ 1.675190] ThumbEE CPU extension supported.
[ 1.679703] Registering SWP/SWPB emulation handler
[ 1.688582] lis3_reg: disabling
[ 1.691885] vbat: disabling
[ 1.694911] regulator-dummy: disabling
[ 1.706831] tps65910 0-002d: No interrupt support, no core IRQ
[ 1.716819] tps65910 0-002d: Error in configuring external control EN1
[ 1.723756] tps65910 0-002d: Failed to initialise ext control config
[ 1.731886] vrtc: failed to enable
[ 1.738066] tps65910 0-002d: failed to register tps65910-pmic regulator
[ 1.745181] tps65910-pmic: probe of tps65910-pmic failed with error -121
[ 1.756782] omap_i2c 44e0b000.i2c: bus 0 rev0.11 at 400 kHz
[ 1.764271] omap_hsmmc 48060000.mmc: vmmc regulator missing
[ 1.770355] platform 48060000.mmc: Driver omap_hsmmc requests probe deferral
[ 1.843468] davinci_mdio 4a101000.mdio: davinci mdio revision 1.6
[ 1.849853] davinci_mdio 4a101000.mdio: detected phy mask fffffffe
[ 1.858931] libphy: 4a101000.mdio: probed
[ 1.863141] davinci_mdio 4a101000.mdio: phy[0]: device 4a101000.mdio:00, driver SMSC LAN8710/LAN8720
[ 1.874445] omap_hsmmc 48060000.mmc: vmmc regulator missing
[ 1.880513] platform 48060000.mmc: Driver omap_hsmmc requests probe deferral
[ 1.889233] Detected MACID = f4:5e:ab:5f:e7:6b
[ 1.896830] omap_hsmmc 48060000.mmc: vmmc regulator missing
[ 1.902886] platform 48060000.mmc: Driver omap_hsmmc requests probe deferral
[ 1.914025] omap_hsmmc 48060000.mmc: vmmc regulator missing
[ 1.920090] platform 48060000.mmc: Driver omap_hsmmc requests probe deferral
[ 1.930453] input: gpio_buttons.7 as /devices/gpio_buttons.7/input/input0
[ 1.941590] omap_hsmmc 48060000.mmc: vmmc regulator missing
[ 1.947852] platform 48060000.mmc: Driver omap_hsmmc requests probe deferral
[ 1.956030] omap_rtc 44e3e000.rtc: setting system clock to 2000-01-01 00:37:19 UTC (946687039)
[ 1.984506] Waiting for root device /dev/mmcblk0p2...内核中配置支持ext3，ext4.
浏览论坛有的说是硬件问题，我试着吧CD脚给注释还是不行这是这么原因呢？
