AM335x(TQ335x)學習筆記——Nand&&網卡驅動移植，am335xtq335x

AM335x(TQ335x)學習筆記——Nand&&網卡驅動移植，am335xtq335x

移植完成音效卡驅動之後本想再接再勵，移植網卡驅動，但沒想到的是TI維護的核心太健壯，移植網卡驅動跟之前移植按鍵驅動一樣簡單，Nand驅動也是如此，於是，本人將Nand和網卡放在同一篇文章中介紹。介紹之前先感慨一下：TI的維護的核心真的很健壯，DTS真的很強大。

1. Nand驅動移植

閱讀TQ335x的原理圖可知，TQ335x的Nand串連到了GPMC上，且都是使用的相應引腳的MODE0複用功能，AM335x上上電複位後這些引腳的預設狀態就處於MODE0模式，故無需進行pinmux設定，原始的DTS中pinmux僅有一條：

0x160 (PIN_INPUT | MUX_MODE7)       /* spi0_cs1.gpio0_6 */

此處不做任何修改，直接編譯核心，並放到開發板上運行會發現核心可以識別Nand但是因為沒有開啟OMAP的BCH功能，該項配置需要在核心配置項中進行配置，配置方式如下：

Device Drivers  ---><*> Memory Technology Device (MTD) support  ---><*>   NAND Device Support  ---><*>     Support hardware based BCH error correction

儲存配置並退出menuconfig，然後重新編譯核心並放到開發板上運行，此時會發現核心已經可以正常識別Nand了，完整的啟動Log會在文章末尾給出。從這裡可以看出，TI的核心維護的真的很不錯，比以前移植三星晶片時省事很多。

2. 網卡驅動移植

進行網卡驅動移植的方法與進行Nand驅動移植的方法相同，邏輯上講，先應該去確認下網卡的引腳串連並在DTS中進行相應的pinmux設定，但是，移植完Nand後查看核心的啟動Log可知，網卡已經正常識別了，因此，可以直接執行指令：

udhcpc

來動態擷取ip（需要將開發板通過網線串連到路由器並開啟路由器的DHCP功能，預設一般是開啟的），會發現開發板能夠從路由器分配到IP，但是沒有分配DNS，這是因為我們只做檔案系統時沒有進行dhcp的設定。設定方法很簡單，將busybox中的examples/udhcp/simple.script拷貝到根檔案系統的usr/share/udhcpc/目錄下，並改名為default.script即可。然後重新執行：

udhcpc

會發現開發板可以正常擷取到IP和DNS，但是仍有一處錯誤，詳細如下：

@tq335x #udhcpc udhcpc (v1.22.1) startedSetting IP address 0.0.0.0 on eth0[   11.489311] net eth0: initializing cpsw version 1.12 (0)[   11.576237] net eth0: phy found : id is : 0x1cc915<span style="color:#ff0000;">[   11.581418] libphy: PHY 4a101000.mdio:01 not found[   11.586480] net eth0: phy 4a101000.mdio:01 not found on slave 1</span>Sending discover...[   13.576458] cpsw 4a100000.ethernet eth0: Link is Up - 100Mbps/Full - flow control rx/txSending discover...Sending select for 192.168.0.103...Lease of 192.168.0.103 obtained, lease time 86400Setting IP address 192.168.0.103 on eth0Deleting routersroute: SIOCDELRT: No such processAdding router 192.168.0.1Recreating /etc/resolv.conf Adding DNS server 10.0.0.1

標記紅色的文字即錯誤所在，參考TI官網提供的evm開發板的dts，本文對tq335x.dts做如下修改：

&mac {    <span style="color:#ff0000;">slaves = <1>;</span>    pinctrl-names = "default", "sleep";    pinctrl-0 = <&cpsw_default>;    pinctrl-1 = <&cpsw_sleep>;    status = "okay";};

然後刪除以下節點：

&cpsw_emac1 {    phy_id = <&davinci_mdio>, <1>;    phy-mode = "rgmii-txid";};

重新編譯tq335x.dtb：

make ARCH=arm CROSS_COMPILE=arm-linux-gnueabi- tq335x.dtb

用新的tq335x.dtb啟動開發板：

load mmc 0:1 0x88000000 /boot/tq335x.dtbload mmc 0:1 0x82000000 /boot/zImagebootz 0x82000000 - 0x88000000

最後，再次使用指令：

udhcpc

進行測試，會發現開發板能夠正常擷取IP和DNS。如果您的路由器已經串連到了外網，還可以使用ping指令測試與外網的串連，如pingGoogle的DNS伺服器：

ping 8.8.8.8

至此，就完成了TQ335x的Nand和網卡驅動移植，並不需要深入的瞭解其內部的工作原理，有問題可以留言討論。如果想瞭解這兩個模組的工作原理，強烈推薦韋東山老師的嵌入式教學視頻，靜下心來看的話，絕對物有所值。該視頻還是需要一定的硬體和軟體功底的，如果看不懂可以補習下C語言、基本原理圖閱讀等方面的知識。

3. 啟動Log

完整的啟動Log如下：

Starting kernel ...[    0.000000] Booting Linux on physical CPU 0x0[    0.000000] Linux version 3.17.2 (lilianrong@smarter) (gcc version 4.7.3 (Ubuntu/Linaro 4.7.3-12ubuntu1) ) #73 SMP Tue Dec 23 22:06:01 CST 2014[    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 16 MiB at 9e800000[    0.000000] Memory policy: Data cache writeback[    0.000000]   HighMem zone: 1048574 pages exceeds freesize 0[    0.000000] CPU: All CPU(s) started in SVC mode.[    0.000000] AM335X ES2.1 (sgx neon )[    0.000000] PERCPU: Embedded 9 pages/cpu @dfa99000 s14336 r8192 d14336 u36864[    0.000000] Built 1 zonelists in Zone order, mobility grouping on.  Total pages: 129792[    0.000000] Kernel command line: console=ttyO0,115200n8 root=/dev/mmcblk0p2 rw rootfstype=ext3 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: 484108K/523264K available (6082K kernel code, 667K rwdata, 2448K rodata, 410K init, 8214K bss, 39156K reserved, 0K highmem)[    0.000000] Virtual kernel memory layout:[    0.000000]     vector  : 0xffff0000 - 0xffff1000   (   4 kB)[    0.000000]     fixmap  : 0xffc00000 - 0xffe00000   (2048 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 - 0xc085cc80   (8532 kB)[    0.000000]       .init : 0xc085d000 - 0xc08c3800   ( 410 kB)[    0.000000]       .data : 0xc08c4000 - 0xc096ac10   ( 668 kB)[    0.000000]        .bss : 0xc096ac10 - 0xc11707a0   (8215 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[    0.000013] sched_clock: 32 bits at 24MHz, resolution 41ns, wraps every 178956969942ns[    0.000062] OMAP clocksource: timer1 at 24000000 Hz[    0.000794] Console: colour dummy device 80x30[    0.000846] Lock dependency validator: Copyright (c) 2006 Red Hat, Inc., Ingo Molnar[    0.000855] ... MAX_LOCKDEP_SUBCLASSES:  8[    0.000863] ... MAX_LOCK_DEPTH:          48[    0.000870] ... MAX_LOCKDEP_KEYS:        8191[    0.000877] ... CLASSHASH_SIZE:          4096[    0.000884] ... MAX_LOCKDEP_ENTRIES:     32768[    0.000891] ... MAX_LOCKDEP_CHAINS:      65536[    0.000898] ... CHAINHASH_SIZE:          32768[    0.000906]  memory used by lock dependency info: 5167 kB[    0.000914]  per task-struct memory footprint: 1152 bytes[    0.000956] Calibrating delay loop... 996.14 BogoMIPS (lpj=4980736)[    0.079052] pid_max: default: 32768 minimum: 301[    0.079452] Security Framework initialized[    0.079577] Mount-cache hash table entries: 1024 (order: 0, 4096 bytes)[    0.079589] Mountpoint-cache hash table entries: 1024 (order: 0, 4096 bytes)[    0.081767] CPU: Testing write buffer coherency: ok[    0.082936] CPU0: thread -1, cpu 0, socket -1, mpidr 0[    0.083055] Setting up static identity map for 0x805c3270 - 0x805c32e0[    0.086292] Brought up 1 CPUs[    0.086313] SMP: Total of 1 processors activated.[    0.086323] CPU: All CPU(s) started in SVC mode.[    0.088953] devtmpfs: initialized[    0.097712] VFP support v0.3: implementor 41 architecture 3 part 30 variant c rev 3[    0.133428] omap_hwmod: tptc0 using broken dt data from edma[    0.133784] omap_hwmod: tptc1 using broken dt data from edma[    0.134117] omap_hwmod: tptc2 using broken dt data from edma[    0.141998] omap_hwmod: debugss: _wait_target_disable failed[    0.199949] pinctrl core: initialized pinctrl subsystem[    0.202465] regulator-dummy: no parameters[    0.232121] NET: Registered protocol family 16[    0.240699] DMA: preallocated 256 KiB pool for atomic coherent allocations[    0.242951] cpuidle: using governor ladder[    0.242981] cpuidle: using governor menu[    0.254980] OMAP GPIO hardware version 0.1[    0.270240] omap-gpmc 50000000.gpmc: could not find pctldev for node /pinmux@44e10800/nandflash_pins_s0, deferring probe[    0.270283] platform 50000000.gpmc: Driver omap-gpmc requests probe deferral[    0.274806] hw-breakpoint: debug architecture 0x4 unsupported.[    0.319718] edma-dma-engine edma-dma-engine.0: TI EDMA DMA engine driver[    0.321050] vbat: 5000 mV [    0.321878] lis3_reg: no parameters[    0.325259] SCSI subsystem initialized[    0.326052] usbcore: registered new interface driver usbfs[    0.326223] usbcore: registered new interface driver hub[    0.330168] usbcore: registered new device driver usb[    0.330998] omap_i2c 44e0b000.i2c: could not find pctldev for node /pinmux@44e10800/pinmux_i2c0_pins, deferring probe[    0.331037] platform 44e0b000.i2c: Driver omap_i2c requests probe deferral[    0.331092] omap_i2c 4802a000.i2c: could not find pctldev for node /pinmux@44e10800/pinmux_i2c1_pins, deferring probe[    0.331116] platform 4802a000.i2c: Driver omap_i2c requests probe deferral[    0.332291] Advanced Linux Sound Architecture Driver Initialized.[    0.335642] Switched to clocksource timer1[    0.487189] NET: Registered protocol family 2[    0.489058] TCP established hash table entries: 4096 (order: 2, 16384 bytes)[    0.489243] TCP bind hash table entries: 4096 (order: 5, 147456 bytes)[    0.490606] TCP: Hash tables configured (established 4096 bind 4096)[    0.490797] TCP: reno registered[    0.490823] UDP hash table entries: 256 (order: 2, 20480 bytes)[    0.491013] UDP-Lite hash table entries: 256 (order: 2, 20480 bytes)[    0.492039] NET: Registered protocol family 1[    0.493915] RPC: Registered named UNIX socket transport module.[    0.493936] RPC: Registered udp transport module.[    0.493946] RPC: Registered tcp transport module.[    0.493955] RPC: Registered tcp NFSv4.1 backchannel transport module.[    0.495229] hw perfevents: enabled with armv7_cortex_a8 PMU driver, 5 counters available[    0.499735] futex hash table entries: 256 (order: 2, 16384 bytes)[    0.504791] VFS: Disk quotas dquot_6.5.2[    0.504950] Dquot-cache hash table entries: 1024 (order 0, 4096 bytes)[    0.507753] NFS: Registering the id_resolver key type[    0.508115] Key type id_resolver registered[    0.508132] Key type id_legacy registered[    0.508279] jffs2: version 2.2. (NAND) (SUMMARY)  漏 2001-2006 Red Hat, Inc.[    0.508729] msgmni has been set to 977[    0.513651] io scheduler noop registered[    0.513685] io scheduler deadline registered[    0.513753] io scheduler cfq registered (default)[    0.516150] pinctrl-single 44e10800.pinmux: 142 pins at pa f9e10800 size 568[    0.521255] backlight supply power not found, using dummy regulator[    0.524492] Serial: 8250/16550 driver, 4 ports, IRQ sharing enabled[    0.530892] omap_uart 44e09000.serial: no wakeirq for uart0[    0.531504] 44e09000.serial: ttyO0 at MMIO 0x44e09000 (irq = 88, base_baud = 3000000) is a OMAP UART0[    1.232153] console [ttyO0] enabled[    1.241558] omap_rng 48310000.rng: OMAP Random Number Generator ver. 20[    1.249198] [drm] Initialized drm 1.1.0 20060810[    1.261409] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).[    1.268521] [drm] No driver support for vblank timestamp query.[    1.331152] Console: switching to colour frame buffer device 100x30[    1.342247] tilcdc 4830e000.lcdc: fb0:  frame buffer device[    1.348135] tilcdc 4830e000.lcdc: registered panic notifier[    1.354036] [drm] Initialized tilcdc 1.0.0 20121205 on minor 0[    1.389964] brd: module loaded[    1.408309] loop: module loaded[    1.414443] mtdoops: mtd device (mtddev=name/number) must be supplied[    1.425081] usbcore: registered new interface driver asix[    1.430985] usbcore: registered new interface driver ax88179_178a[    1.437512] usbcore: registered new interface driver cdc_ether[    1.443772] usbcore: registered new interface driver smsc95xx[    1.449928] usbcore: registered new interface driver net1080[    1.455981] usbcore: registered new interface driver cdc_subset[    1.462281] usbcore: registered new interface driver zaurus[    1.468354] usbcore: registered new interface driver cdc_ncm[    1.476438] usbcore: registered new interface driver cdc_wdm[    1.482554] usbcore: registered new interface driver usb-storage[    1.489102] usbcore: registered new interface driver usbtest[    1.497261] mousedev: PS/2 mouse device common for all mice[    1.508204] omap_rtc 44e3e000.rtc: rtc core: registered 44e3e000.rtc as rtc0[    1.516418] i2c /dev entries driver[    1.520156] Driver for 1-wire Dallas network protocol.[    1.533123] omap_wdt: OMAP Watchdog Timer Rev 0x01: initial timeout 60 sec[    1.543243] omap_hsmmc 48060000.mmc: unable to get vmmc regulator -517[    1.550707] platform 48060000.mmc: Driver omap_hsmmc requests probe deferral[    1.560219] ledtrig-cpu: registered to indicate activity on CPUs[    1.567132] usbcore: registered new interface driver usbhid[    1.572953] usbhid: USB HID core driver[    1.584275] davinci_evm sound: ASoC: CODEC (null) not registered[    1.591095] davinci_evm sound: snd_soc_register_card failed (-517)[    1.597727] platform sound: Driver davinci_evm requests probe deferral[    1.605542] oprofile: using arm/armv7[    1.610156] TCP: cubic registered[    1.613633] Initializing XFRM netlink socket[    1.618345] NET: Registered protocol family 17[    1.623080] NET: Registered protocol family 15[    1.628155] Key type dns_resolver registered[    1.632833] omap_voltage_late_init: Voltage driver support not added[    1.639539] sr_dev_init: No voltage domain specified for smartreflex0. Cannot initialize[    1.648011] sr_dev_init: No voltage domain specified for smartreflex1. Cannot initialize[    1.657602] ThumbEE CPU extension supported.[    1.662123] Registering SWP/SWPB emulation handler[    1.667204] SmartReflex Class3 initialized[    1.679204] omap-gpmc 50000000.gpmc: GPMC revision 6.0[    1.686359] nand: device found, Manufacturer ID: 0xec, Chip ID: 0xd3[    1.693006] nand: Samsung NAND 1GiB 3,3V 8-bit[    1.697702] nand: 1024MiB, SLC, page size: 2048, OOB size: 64[    1.703702] nand: using OMAP_ECC_BCH8_CODE_HW ECC scheme[    1.709544] 10 ofpart partitions found on MTD device omap2-nand.0[    1.715935] Creating 10 MTD partitions on "omap2-nand.0":[    1.721581] 0x000000000000-0x000000020000 : "NAND.SPL"[    1.738760] 0x000000020000-0x000000040000 : "NAND.SPL.backup1"[    1.750072] 0x000000040000-0x000000060000 : "NAND.SPL.backup2"[    1.759540] 0x000000060000-0x000000080000 : "NAND.SPL.backup3"[    1.770709] 0x000000080000-0x0000000c0000 : "NAND.u-boot-spl"[    1.780999] 0x0000000c0000-0x0000001c0000 : "NAND.u-boot"[    1.794193] 0x0000001c0000-0x0000001e0000 : "NAND.u-boot-env"[    1.803810] 0x0000001e0000-0x000000200000 : "NAND.u-boot-env.backup1"[    1.815705] 0x000000200000-0x000000a00000 : "NAND.kernel"[    1.831741] 0x000000a00000-0x000010000000 : "NAND.file-system"[    2.128744] tps65910 0-002d: No interrupt support, no core IRQ[    2.145804] vrtc: 1800 mV [    2.149201] vrtc: supplied by vbat[    2.156403] vio: at 1500 mV [    2.159674] vio: supplied by vbat[    2.166535] vdd_mpu: 912 <--> 1312 mV at 1325 mV [    2.171674] vdd_mpu: supplied by vbat[    2.178847] vdd_core: 912 <--> 1150 mV at 1137 mV [    2.184071] vdd_core: supplied by vbat[    2.190808] vdd3: 5000 mV [    2.196352] vdig1: at 1800 mV [    2.199763] vdig1: supplied by vbat[    2.206242] vdig2: at 1800 mV [    2.209646] vdig2: supplied by vbat[    2.216312] vpll: at 1800 mV [    2.219632] vpll: supplied by vbat[    2.226021] vdac: at 1800 mV [    2.229339] vdac: supplied by vbat[    2.235593] vaux1: at 1800 mV [    2.238998] vaux1: supplied by vbat[    2.245289] vaux2: at 3300 mV [    2.248809] vaux2: supplied by vbat[    2.255223] vaux33: at 3300 mV [    2.258804] vaux33: supplied by vbat[    2.265220] vmmc: 1800 <--> 3300 mV at 3300 mV [    2.270279] vmmc: supplied by vbat[    2.276822] vbb: at 3000 mV [    2.280309] vbb: supplied by vbat[    2.288030] omap_i2c 44e0b000.i2c: bus 0 rev0.11 at 400 kHz[    2.301649] omap_i2c 4802a000.i2c: bus 1 rev0.11 at 100 kHz[    2.347377] wm8960 0-001a: No platform data supplied[    2.424716] mmc0: host does not support reading read-only switch. assuming write-enable.[    2.436373] mmc0: new high speed SDHC card at address aaaa[    2.444716] mmcblk0: mmc0:aaaa SL16G 14.8 GiB [    2.456727]  mmcblk0: p1 p2[    2.471831] davinci_evm sound: wm8960-hifi <-> 4803c000.mcasp mapping ok[    2.555784] davinci_mdio 4a101000.mdio: davinci mdio revision 1.6[    2.562174] davinci_mdio 4a101000.mdio: detected phy mask ffffffde[    2.572385] libphy: 4a101000.mdio: probed[    2.576709] davinci_mdio 4a101000.mdio: phy[0]: device 4a101000.mdio:00, driver unknown[    2.585071] davinci_mdio 4a101000.mdio: phy[5]: device 4a101000.mdio:05, driver unknown[    2.594702] cpsw 4a100000.ethernet: Detected MACID = c4:ed:ba:88:b5:e4[    2.606568] input: gpio_keyad@0 as /devices/gpio_keyad@0/input/input0[    2.616308] omap_rtc 44e3e000.rtc: setting system clock to 2000-01-01 00:00:00 UTC (946684800)[    2.625329] sr_init: No PMIC hook to init smartreflex[    2.630961] sr_init: platform driver register failed for SR[    2.653937] lis3_reg: disabling[    2.657604] ALSA device list:[    2.660710]   #0: AM335x-EVM[    2.779242] kjournald starting.  Commit interval 5 seconds[    2.787736] EXT3-fs (mmcblk0p2): using internal journal[    2.795710] EXT3-fs (mmcblk0p2): recovery complete[    2.800726] EXT3-fs (mmcblk0p2): mounted filesystem with ordered data mode[    2.808089] VFS: Mounted root (ext3 filesystem) on device 179:2.[    2.818461] devtmpfs: mounted[    2.822292] Freeing unused kernel memory: 408K (c085d000 - c08c3000)----------mount all..........----------Starting mdev......Please press Enter to activate this console. @tq335x #@tq335x #udhcpc udhcpc (v1.22.1) startedSetting IP address 0.0.0.0 on eth0[   11.489311] net eth0: initializing cpsw version 1.12 (0)[   11.576237] net eth0: phy found : id is : 0x1cc915[   11.581418] libphy: PHY 4a101000.mdio:01 not found[   11.586480] net eth0: phy 4a101000.mdio:01 not found on slave 1Sending discover...[   13.576458] cpsw 4a100000.ethernet eth0: Link is Up - 100Mbps/Full - flow control rx/txSending discover...Sending select for 192.168.0.103...Lease of 192.168.0.103 obtained, lease time 86400Setting IP address 192.168.0.103 on eth0Deleting routersroute: SIOCDELRT: No such processAdding router 192.168.0.1Recreating /etc/resolv.conf Adding DNS server 10.0.0.1@tq335x #ping 8.8.8.8PING 8.8.8.8 (8.8.8.8): 56 data bytes64 bytes from 8.8.8.8: seq=0 ttl=38 time=471.858 ms64 bytes from 8.8.8.8: seq=1 ttl=38 time=479.178 ms64 bytes from 8.8.8.8: seq=3 ttl=38 time=574.362 ms64 bytes from 8.8.8.8: seq=4 ttl=38 time=476.201 ms^C--- 8.8.8.8 ping statistics ---5 packets transmitted, 4 packets received, 20% packet lossround-trip min/avg/max = 471.858/500.399/574.362 ms@tq335x #

本文作者：girlkoo

本文串連：http://blog.csdn.net/girlkoo/article/details/42110683