如何在am335x uboot中使能MMC2挂载SD卡

你的Linux内核放在哪里？也是SD卡上么？

内核从串口加载

内核比较大，不建议从串口加载，最好放在SD卡上。

这个没什么问题，之前用开发板，内核损坏了，也是从串口把内核加载上去的，系统启动完成再更新内核文件

目的就是烧写emmc

印象中，我们的各个版本的SDK中都没有做MMC2的driver初始化，所以要先做这块的初始化操作工作。使能pinmux，使能相关的module。

具体的操作没做过，因为目前没有什么EVM板这么接过，所以没啥平台可以实际操作的。

你目前是基于哪个Linux SDK版本做的？有做过初始化的操作，然后fail了吗？有没有相关操作的log？

uboot版本：2015.07

在board/ti/am335x/mux.c中增加

static struct module_pin_mux mmc2_pin_mux[] = {
    {OFFSET(gpmc_ad15), (MODE(3) | RXACTIVE | PULLUP_EN)},    /* MMC2_DAT3 */
    {OFFSET(gpmc_ad14), (MODE(3) | RXACTIVE | PULLUP_EN)},    /* MMC2_DAT2 */
    {OFFSET(gpmc_ad13), (MODE(3) | RXACTIVE | PULLUP_EN)},    /* MMC2_DAT1 */
    {OFFSET(gpmc_ad12), (MODE(3) | RXACTIVE | PULLUP_EN)},    /* MMC2_DAT0 */
    {OFFSET(gpmc_clk), (MODE(3) | RXACTIVE | PULLUP_EN)},    /* MMC2_CLK */
    {OFFSET(gpmc_csn3), (MODE(3) | RXACTIVE | PULLUP_EN)},    /* MMC2_CMD */
    {OFFSET(gpmc_wpn), (MODE(4) | RXACTIVE | PULLUP_EN)},    /* MMC2_CD */
    {-1},
};

相同文件下void enable_board_pin_mux(void)
函数增加configure_module_pin_mux(mmc2_pin_mux);

在arch/arm/include/asm/arch-am335x/mmc_host_def.h增加#define OMAP_HSMMC3_BASE 0x47810100

U-Boot# md.w 0x47810100
47810100: 0000 0000 0000 0000 0000 0000 0000 0000    ................
47810110: 2015 0000 0001 0000 0000 0000 0000 0000    . ..............
47810120: 0000 0000 0000 0000 0000 0000 0600 0000    ................
47810130: 0000 0000 0000 0000 0000 0000 0000 0000    ................
47810140: 0000 0000 0000 0000 0000 0000 0000 0000    ................
47810150: 0000 0000 0000 0000 0000 0000 0000 0000    ................
47810160: 0000 0000 0000 0000 0000 0000 0000 0000    ................
47810170: 0000 0000 0000 0000 0000 0000 0000 0000    ................
U-Boot# mmc list
OMAP SD/MMC: 0
OMAP SD/MMC: 1 (eMMC)

U-Boot# boot
MMC Device 2 not found
no mmc device at slot 2
SD/MMC found on device 2
MMC Device 2 not found
no mmc device at slot 2
SD/MMC found on device 2
MMC Device 2 not found
** Bad device mmc 2 **
MMC Device 2 not found
** Bad device mmc 2 **
** No partition table - mmc 1 **
switch to partitions #0, OK
mmc1(part 0) is current device
SD/MMC found on device 1
switch to partitions #0, OK
mmc1(part 0) is current device
SD/MMC found on device 1
Failed to mount ext2 filesystem...
** Unrecognized filesystem type **
** Unrecognized filesystem type **
** No partition table - mmc 1 **
Booting from nand ...

no devices available

no devices available
Bad Linux ARM zImage magic!

不是的 并没有挂载上去，查询这个设备号是没有设备的，是不是mmc限制只有两个挂载点

你用的是哪个版本的u-boot，需要看下configure文件。

如果成功挂载会显示（SD）的

这个文件在哪里

uboot 版本SDK2.0

楼上是我搞错SD卡了，插入正确的SD卡后可以启动，

从串口加载uboot，然后启动内核，系统启动到一半卡住了，是不是接口重新初始化了还是什么问题

Starting xmodem transfer.  Press Ctrl+C to cancel.
Transferring u-boot-spl.bin...
  100%      64 KB      10 KB/sec    00:00:06       0 Errors  


U-Boot SPL 2015.07 (Dec 17 2016 - 15:04:58)
i2c_read: error waiting for addr ACK (status=0x106)
i2c_read: error waiting for addr ACK (status=0x106)
C
Transferring u-boot.img, errors 1...l+C to cancel.
  100%     365 KB       5 KB/sec    00:01:10       2 Errors  

Loaded 373788 bytes


U-Boot 2015.07 (Dec 17 2016 - 15:04:58 +0800)

       Watchdog enabled
I2C:   ready
DRAM:  512 MiB
NAND:  0 MiB
MMC:   OMAP SD/MMC: 0, OMAP SD/MMC: 1, OMAP SD/MMC: 2
** Bad device mmc 0 **
Using default environment

Net:   <ethaddr> not set. Validating first E-fuse MAC
Phy 4 not found
cpsw, usb_ether
Hit any key to stop autoboot:  0
Card did not respond to voltage select!
switch to partitions #0, OK
mmc1 is current device
SD/MMC found on device 1
switch to partitions #0, OK
mmc1 is current device
SD/MMC found on device 1
reading boot.scr
** Unable to read file boot.scr **
reading uEnv.txt
** Unable to read file uEnv.txt **
reading zImage
4005584 bytes read in 503 ms (7.6 MiB/s)
reading am335x-evm.dtb
34052 bytes read in 13 ms (2.5 MiB/s)
Kernel image @ 0x82000000 [ 0x000000 - 0x3d1ed0 ]
## Flattened Device Tree blob at 88000000
   Booting using the fdt blob at 0x88000000
   Loading Device Tree to 8fff4000, end 8ffff503 ... OK

Starting kernel ...

[    0.000000] Booting Linux on physical CPU 0x0
[    0.000000] Initializing cgroup subsys cpu
[    0.000000] Initializing cgroup subsys cpuacct
[    0.000000] Linux version 4.1.18 (root@pc) (gcc version 4.9.3 20150413 (prerelease) (Linaro GCC 4.9-2015.05) ) #45 PREEMPT Fri Dec 16 12:13:32 CST 2016
[    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
[    0.000000] cma: Reserved 24 MiB at 0x9e800000
[    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] Built 1 zonelists in Zone order, mobility grouping on.  Total pages: 129920
[    0.000000] Kernel command line: console=ttyO0,115200n8 root=PARTUUID=ccd4ebea-02 rw rootfstype=ext4 rootwait
[    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: 483148K/524288K available (7747K kernel code, 325K rwdata, 2672K rodata, 280K init, 244K bss, 16564K reserved, 24576K cma-reserved, 0K highmem)
[    0.000000] Virtual kernel memory layout:
[    0.000000]     vector  : 0xffff0000 - 0xffff1000   (   4 kB)
[    0.000000]     fixmap  : 0xffc00000 - 0xfff00000   (3072 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 - 0xc0a3505c   (10421 kB)
[    0.000000]       .init : 0xc0a36000 - 0xc0a7c000   ( 280 kB)
[    0.000000]       .data : 0xc0a7c000 - 0xc0acd4c8   ( 326 kB)
[    0.000000]        .bss : 0xc0ad0000 - 0xc0b0d058   ( 245 kB)
[    0.000000] SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=1, Nodes=1
[    0.000000] Preemptible hierarchical RCU implementation.
[    0.000000]  Additional per-CPU info printed with stalls.
[    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] OMAP clockevent source: timer2 at 25000000 Hz
[    0.000033] sched_clock: 32 bits at 25MHz, resolution 40ns, wraps every 85899345900ns
[    0.000079] clocksource timer1: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 76450417870 ns
[    0.000106] OMAP clocksource: timer1 at 25000000 Hz
[    0.000482] Console: colour dummy device 80x30
[    0.000534] WARNING: Your 'console=ttyO0' has been replaced by 'ttyS0'
[    0.000550] This ensures that you still see kernel messages. Please
[    0.000566] update your kernel commandline.
[    0.000604] Calibrating delay loop... 298.59 BogoMIPS (lpj=1492992)
[    0.067750] pid_max: default: 32768 minimum: 301
[    0.068006] Security Framework initialized
[    0.068123] Mount-cache hash table entries: 1024 (order: 0, 4096 bytes)
[    0.068152] Mountpoint-cache hash table entries: 1024 (order: 0, 4096 bytes)
[    0.069666] Initializing cgroup subsys blkio
[    0.069723] Initializing cgroup subsys memory
[    0.069818] Initializing cgroup subsys devices
[    0.069858] Initializing cgroup subsys freezer
[    0.069895] Initializing cgroup subsys perf_event
[    0.069960] CPU: Testing write buffer coherency: ok
[    0.070729] Setting up static identity map for 0x80008200 - 0x80008270
[    0.074208] devtmpfs: initialized
[    0.101836] VFP support v0.3: implementor 41 architecture 3 part 30 variant c rev 3
[    0.134873] omap_hwmod: debugss: _wait_target_disable failed
[    0.204818] clocksource jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 19112604462750000 ns
[    0.209671] pinctrl core: initialized pinctrl subsystem
[    0.212607] NET: Registered protocol family 16
[    0.218428] DMA: preallocated 256 KiB pool for atomic coherent allocations
[    0.247836] cpuidle: using governor ladder
[    0.277814] cpuidle: using governor menu
[    0.289022] OMAP GPIO hardware version 0.1
[    0.313548] No ATAGs?
[    0.313619] hw-breakpoint: debug architecture 0x4 unsupported.
[    0.393080] edma 49000000.edma: TI EDMA DMA engine driver
[    0.401503] vgaarb: loaded
[    0.402735] SCSI subsystem initialized
[    0.403536] usbcore: registered new interface driver usbfs
[    0.403736] usbcore: registered new interface driver hub
[    0.403978] usbcore: registered new device driver usb
[    0.405346] omap_i2c 44e0b000.i2c: could not find pctldev for node /ocp/l4_wkup@44c00000/scm@210000/pinmux@800/pinmux_i2c0_pins, deferring probe
[    0.405662] media: Linux media interface: v0.10
[    0.405848] Linux video capture interface: v2.00
[    0.405982] pps_core: LinuxPPS API ver. 1 registered
[    0.406004] pps_core: Software ver. 5.3.6 - Copyright 2005-2007 Rodolfo Giometti <giometti@linux.it>
[    0.406091] PTP clock support registered
[    0.408273] omap-mailbox 480c8000.mailbox: omap mailbox rev 0x400
[    0.408775] Advanced Linux Sound Architecture Driver Initialized.
[    0.412763] Switched to clocksource timer1
[    0.440571] NET: Registered protocol family 2
[    0.442485] TCP established hash table entries: 4096 (order: 2, 16384 bytes)
[    0.442624] TCP bind hash table entries: 4096 (order: 2, 16384 bytes)
[    0.442903] TCP: Hash tables configured (established 4096 bind 4096)
[    0.443094] UDP hash table entries: 256 (order: 0, 4096 bytes)
[    0.443148] UDP-Lite hash table entries: 256 (order: 0, 4096 bytes)
[    0.443534] NET: Registered protocol family 1
[    0.444327] RPC: Registered named UNIX socket transport module.
[    0.444361] RPC: Registered udp transport module.
[    0.444378] RPC: Registered tcp transport module.
[    0.444396] RPC: Registered tcp NFSv4.1 backchannel transport module.
[    0.446376] CPU PMU: Failed to parse /pmu/interrupt-affinity[0]
[    0.446488] hw perfevents: enabled with armv7_cortex_a8 PMU driver, 5 counters available
[    0.451276] futex hash table entries: 256 (order: -1, 3072 bytes)
[    0.451501] audit: initializing netlink subsys (disabled)
[    0.451631] audit: type=2000 audit(0.440:1): initialized
[    0.471443] VFS: Disk quotas dquot_6.6.0
[    0.471978] VFS: Dquot-cache hash table entries: 1024 (order 0, 4096 bytes)
[    0.478140] NFS: Registering the id_resolver key type
[    0.478289] Key type id_resolver registered
[    0.478313] Key type id_legacy registered
[    0.478498] jffs2: version 2.2. (NAND) (SUMMARY)  漏 2001-2006 Red Hat, Inc.
[    0.485657] NET: Registered protocol family 38
[    0.485823] io scheduler noop registered
[    0.485856] io scheduler deadline registered
[    0.485992] io scheduler cfq registered (default)
[    0.488403] pinctrl-single 44e10800.pinmux: 142 pins at pa f9e10800 size 568
[    0.494539] wkup_m3_ipc 44e11324.wkup_m3_ipc: could not get rproc handle
[    0.496934] Serial: 8250/16550 driver, 10 ports, IRQ sharing enabled
[    0.506255] 44e09000.serial: ttyS0 at MMIO 0x44e09000 (irq = 158, base_baud = 3000000) is a 8250
[    1.144990] console [ttyS0] enabled
[    1.150747] 48022000.serial: ttyS1 at MMIO 0x48022000 (irq = 159, base_baud = 3000000) is a 8250
[    1.161733] 481a6000.serial: ttyS3 at MMIO 0x481a6000 (irq = 160, base_baud = 3000000) is a 8250
[    1.173320] [drm] Initialized drm 1.1.0 20060810
[    1.180844] tilcdc 4830e000.lcdc: no encoders/connectors found
[    1.187030] tilcdc 4830e000.lcdc: failed to initialize mode setting
[    1.220976] brd: module loaded
[    1.237477] loop: module loaded
[    1.243323] mtdoops: mtd device (mtddev=name/number) must be supplied
[    1.322902] davinci_mdio 4a101000.mdio: davinci mdio revision 1.6
[    1.329083] davinci_mdio 4a101000.mdio: no live phy, scanning all
[    1.335831] davinci_mdio: probe of 4a101000.mdio failed with error -5
[    1.343876] cpsw 4a100000.ethernet: Detected MACID = d0:ff:50:31:e3:1e
[    1.369931] PPP generic driver version 2.4.2
[    1.375081] PPP BSD Compression module registered
[    1.379848] PPP Deflate Compression module registered
[    1.385067] PPP MPPE Compression module registered
[    1.389936] NET: Registered protocol family 24
[    1.396732] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
[    1.403457] ehci-pci: EHCI PCI platform driver
[    1.408146] ehci-omap: OMAP-EHCI Host Controller driver
[    1.413855] ohci_hcd: USB 1.1 'Open' Host Controller (OHCI) Driver
[    1.420131] ohci-pci: OHCI PCI platform driver
[    1.424849] ohci-platform: OHCI generic platform driver
[    1.431299] usbcore: registered new interface driver cdc_acm
[    1.437072] cdc_acm: USB Abstract Control Model driver for USB modems and ISDN adapters
[    1.445331] usbcore: registered new interface driver cdc_wdm
[    1.451244] usbcore: registered new interface driver usb-storage
[    1.457745] usbcore: registered new interface driver usbserial
[    1.463809] usbcore: registered new interface driver option
[    1.469534] usbserial: USB Serial support registered for GSM modem (1-port)
[    1.480379] 47401300.usb-phy supply vcc not found, using dummy regulator
[    1.516293] musb-hdrc musb-hdrc.0.auto: Failed to request rx1.
[    1.522347] musb-hdrc musb-hdrc.0.auto: musb_init_controller failed with status -517
[    1.532185] 47401b00.usb-phy supply vcc not found, using dummy regulator
[    1.566107] musb-hdrc musb-hdrc.1.auto: Failed to request rx1.
[    1.572137] musb-hdrc musb-hdrc.1.auto: musb_init_controller failed with status -517
[    1.598111] mousedev: PS/2 mouse device common for all mice
[    1.604828] i2c /dev entries driver
[    1.608716] usbcore: registered new interface driver uvcvideo
[    1.614701] USB Video Class driver (1.1.1)
[    1.703953] pinctrl-single 44e10800.pinmux: pin 44e109b4.0 already requested by 44e10800.pinmux; cannot claim for leds
[    1.714927] pinctrl-single 44e10800.pinmux: pin-109 (leds) status -22
[    1.721525] pinctrl-single 44e10800.pinmux: could not request pin 109 (44e109b4.0) from group user_leds_s0  on device pinctrl-single
[    1.734654] leds-gpio leds: Error applying setting, reverse things back
[    1.753565] ledtrig-cpu: registered to indicate activity on CPUs
[    1.760242] usbcore: registered new interface driver usbhid
[    1.766112] usbhid: USB HID core driver
[    1.771060]  remoteproc0: wkup_m3 is available
[    1.775661]  remoteproc0: Note: remoteproc is still under development and considered experimental.
[    1.784798]  remoteproc0: THE BINARY FORMAT IS NOT YET FINALIZED, and backward compatibility isn't yet guaranteed.
[    1.795634]  remoteproc0: Direct firmware load for am335x-pm-firmware.elf failed with error -2
[    1.808025] usbcore: registered new interface driver snd-usb-audio
[    1.814500]  remoteproc0: Falling back to user helper
[    1.819715] mmc1: MAN_BKOPS_EN bit is not set
[    1.824495] usbcore: registered new interface driver snd-ua101
[    1.830579] usbcore: registered new interface driver snd-usb-caiaq
[    1.837540] usbcore: registered new interface driver snd-usb-6fire
[    1.844122] usbcore: registered new interface driver snd-usb-hiface
[    1.850681] usbcore: registered new interface driver snd-bcd2000
[    1.857205] mmc1: new high speed MMC card at address 0001
[    1.862986] usbcore: registered new interface driver snd_usb_pod
[    1.869192] usbcore: registered new interface driver snd_usb_podhd
[    1.876503] mmcblk0: mmc1:0001 004G90 3.69 GiB
[    1.881432] mmcblk0boot0: mmc1:0001 004G90 partition 1 2.00 MiB
[    1.887736] usbcore: registered new interface driver snd_usb_toneport
[    1.894636] mmcblk0boot1: mmc1:0001 004G90 partition 2 2.00 MiB
[    1.901687] usbcore: registered new interface driver snd_usb_variax
[    1.916932] oprofile: using arm/armv7
[    1.920863] nf_conntrack version 0.5.0 (7933 buckets, 31732 max)
[    1.930456] ip_tables: (C) 2000-2006 Netfilter Core Team
[    1.936472] Initializing XFRM netlink socket
[    1.940883] NET: Registered protocol family 17
[    1.945517] NET: Registered protocol family 15
[    1.950134] lib80211: common routines for IEEE802.11 drivers
[    1.956131] Key type dns_resolver registered
[    1.960994] omap_voltage_late_init: Voltage driver support not added
[    1.968303] cpu cpu0: of_pm_voltdm_notifier_register: Failed to get cpu0 regulator/voltdm: -517
[    1.977179] cpu cpu0: cpu0 clock notifier not ready, retry
[    1.983606] ThumbEE CPU extension supported.
[    1.987971] Registering SWP/SWPB emulation handler
[    2.013338] tps65217 0-0024: Read from reg 0x16 failed
[    2.018550] vdds_dpr: failed to enable
[    2.022699] tps65217 0-0024: failed to register tps65217-pmic regulator
[    2.029639] tps65217-pmic: probe of tps65217-pmic failed with error -121
[    2.037170] tps65217 0-0024: Failed to read revision register: -121
[    2.043732] tps65217: probe of 0-0024 failed with error -121
[    2.049582] omap_i2c 44e0b000.i2c: bus 0 rev0.11 at 400 kHz
[    2.069482] musb-hdrc musb-hdrc.0.auto: MUSB HDRC host driver
[    2.076124] musb-hdrc musb-hdrc.0.auto: new USB bus registered, assigned bus number 1
[    2.084575] usb usb1: New USB device found, idVendor=1d6b, idProduct=0002
[    2.091427] usb usb1: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[    2.098765] usb usb1: Product: MUSB HDRC host driver
[    2.103813] usb usb1: Manufacturer: Linux 4.1.18 musb-hcd
[    2.109257] usb usb1: SerialNumber: musb-hdrc.0.auto
[    2.116054] hub 1-0:1.0: USB hub found
[    2.119945] hub 1-0:1.0: 1 port detected
[    2.165642] musb-hdrc musb-hdrc.1.auto: MUSB HDRC host driver
[    2.172081] musb-hdrc musb-hdrc.1.auto: new USB bus registered, assigned bus number 2
[    2.180494] usb usb2: New USB device found, idVendor=1d6b, idProduct=0002
[    2.187413] usb usb2: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[    2.194730] usb usb2: Product: MUSB HDRC host driver
[    2.199739] usb usb2: Manufacturer: Linux 4.1.18 musb-hcd
[    2.205219] usb usb2: SerialNumber: musb-hdrc.1.auto
[    2.211857] hub 2-0:1.0: USB hub found
[    2.215892] hub 2-0:1.0: 1 port detected
[    2.243415] cpu cpu0: of_pm_voltdm_notifier_register: Failed to get cpu0 regulator/voltdm: -517
[    2.252200] cpu cpu0: cpu0 clock notifier not ready, retry
[    2.259238] hctosys: unable to open rtc device (rtc0)
[    2.273023] ALSA device list:
[    2.276060]   No soundcards found.
[    2.281693] Waiting for root device PARTUUID=ccd4ebea-02...
[    2.734246] musb-hdrc musb-hdrc.0.auto: VBUS_ERROR in a_wait_vrise (80, <SessEnd), retry #3, port1 0008010c
[    2.829990] musb-hdrc musb-hdrc.1.auto: VBUS_ERROR in a_wait_vrise (80, <SessEnd), retry #3, port1 0008010c
^C^C



[   61.833106]  remoteproc0: failed to load am335x-pm-firmware.elf
[   61.839140]  remoteproc0: powering up wkup_m3
[   61.843825]  remoteproc0: Direct firmware load for am335x-pm-firmware.elf failed with error -2
[   61.852498]  remoteproc0: Falling back to user helper
[  121.853020]  remoteproc0: request_firmware failed: -11
[  121.858211]  remoteproc0: rproc_boot failed
[  136.592819] random: nonblocking pool is initialized