AM335x (TQ335x) study notes -- start the kernel, am335xtq335x

AM335x (TQ335x) study notes -- start the kernel, am335xtq335x

Old-fashioned u-boot uses the ATAGS method to start the Linux kernel. This article uses the new dtb method to start the kernel.

The kernel I use is the linux-3.17.2 version and the kernel is compiled below.

(1) decompress the kernel

tar jxf linux-3.17.2.tar.bz2

(2) configure the Linux kernel. Because am335x is classified as the omap2 series in the kernel, you can use the following command:

make ARCH=arm omap2plus_defconfig

(3) Compile the kernel:

make ARCH=arm CROSS_COMPILE=arm-linux-gnueabi- -j8

My linux tool chain prefix is arm-linux-gnueabi-, which needs to be replaced based on your actual tool chain situation.

(4) Compile dtb:

make ARCH=arm CROSS_COMPILE=arm-linux-gnueabi- am335x-evm.dtb

(5) create a boot disk:

Format SD as a FAT system and copy the MLO and u-boot.img to the root directory.

Create the boot directory in the root directory and copy the compiled zImage and am335x-evm.dtb to the directory.

(6) run the u-boot command to start the Linux kernel.

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

Now, the Linux kernel can be started. The Log information is as follows:

U-Boot # load mmc 0 $ {fdtaddr}/boot/tq335x. dtb1_20 bytes read in 9 MS (3.7 MiB/s) U-Boot # load mmc 0 ${loadaddr}/boot/zImage4385928 bytes read in 243 MS (17.2 MiB/s) u-Boot # bootz $ {loadaddr}-$ {fdtaddr} Kernel image @ 0x82000000 [0x000000-0x42ec88] # Flattened Device Tree blob at 88000000 Booting using the fdt blob at 0x88000000 Loading Device Tree to 8fff4000, end 8ffff79f... OKStarting kern El... [0.000000] Booting Linux on physical CPU 0x0 [0.000000] Linux version 3.17.2 (lilianrong @ ay140721084813287e77z) (gcc version 4.7.3 (Ubuntu/Linaro 4.7.3-121_tu1 )) #1 SMP Mon Nov 10 20:46:04 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 AM33 5x 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 @ dfa9a000 s14336 r8192 d14336 u000064 [0.000000] Built 1 zonelists in Zone order, mobility grouping on. total pages: 1297 92 [0.000000] Kernel command line: console = ttyO0, 115200n8 root = ubi0: rootfs rw ubi. mtd = 9,2048 rootfstype = ubifs rootwait = 1 [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: 484792 K/523264 K available (5668 K kernel code, 64 7 K rwdata, 2208 K rodata, 406 K init, 8210 K bss, 38472 K reserved, 0 K 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] module S: 0xbf000000-0xbfe00000( 14 MB) [0.000000]. text: 0xc0008000-0xc07b9478 (7878 kB) [0.000000]. init: 0xc07ba000-0xc081f800 (406 kB) [0.000000]. data: 0xc0820000-0xc08c1d08 (648 kB) [0.000000]. bss: 0xc08c1d08-0xc10c68e0 (8211 kB) [0.000000] Hierarchical RCU implementation. [1, 0.000000] RCU restricting CPUs from NR_CPUS = 2 to nr_cpu_ids = 1. [1, 0.000000] RCU: Adjusting geometry for rcu_f Anout_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 24000000Hz [0.000016] sched_clock: 32 bits at 24 MHz, resolution 41ns, wraps every 178956969942ns [0.000065] OMAP clocksource: timer1 at 24000000Hz [0.00 0805] Console: color dummy device 80x30 [0.000857] Lock dependency validator: Copyright (c) 2006 Red Hat, Inc ., ingo Molnar [0.000865]... MAX_LOCKDEP_SUBCLASSES: 8 [0.000873]... MAX_LOCK_DEPTH: 48 [0.000880]... MAX_LOCKDEP_KEYS: 8191 [0.000888]... CLASSHASH_SIZE: 4096 [0.000895]... MAX_LOCKDEP_ENTRIES: 32768 [0.000902]... MAX_LOCKDEP_CHAINS: 65536 [0.000909]... CHAINHASH_SIZE: 32768 [0.000 916] memory used by lock dependency info: 5167 kB [0.000924] per task-struct memory footprint: 1152 bytes [0.000966] Calibrating delay loop... 996.14 BogoMIPS (lpj = 4980736) [0.079040] pid_max: default: 32768 minimum: 301 [0.079436] Security Framework initialized [0.079561] Mount-cache hash table entries: 1024 (order: 0, 4096 bytes) [0.079574] Mountpoint-cache hash table entries: 1024 (order: 0, 40 96 bytes) [0.081771] CPU: Testing write buffer coherency: OK [0.082962] CPU0: thread-1, cpu 0, socket-1, mpidr 0 [0.083083] Setting up static identity map for 0x8055f030-0x8055f0a0 [0.086327] Brought up 1 CPUs [0.086346] SMP: Total of 1 processors activated. [2, 0.086356] CPU: All CPU (s) started in SVC mode. [0.088958] devtmpfs: initialized [0.097809] VFP support v0.3: implementor 41 architecture 3 part 30 variant c rev 3 [0.134392] omap_hwmod: tptc0 using broken dt data from edma [0.134758] omap_hwmod: tptc1 using broken dt data from edma [0.135103] omap_hwmod: tptc2 using broken dt data from edma [0.143122] omap_hwmod: debugss: _ wait_target_disable failed [0.201002] pinctrl core: initialized pinctrl subsystem [0.203537] regulator-dummy: no parameters [0.233163] NET: registered protocol Family 16 [0.241735] DMA: preallocated 256 KiB pool for atomic coherent allocations [0.243918] cpuidle: using governor ladder [0.243946] cpuidle: using governor menu [0.255876] omap gpio hardware version 0.1 [0.271254] omap-gpmc 50000000. gpmc: cocould not find pctldev for node/pinmux @ 44e10800/nandflash_pins_s0, deferring probe [0.271303] platform 50000000. gpmc: Driver omap-gpmc requests probe defer Ral [0.275826] No ATAGs? [0.275857] hw-breakpoint: debug architecture 0x4 unsupported. [0.319359] edma-dma-engine edma-dma-engine.0: ti edma dma engine driver [0.320718] vbat: 5000 mV [0.321481] lis3_reg: no parameters [0.324766] SCSI subsystem initialized [0.325577] usbcore: registered new interface driver usbfs [0.325755] usbcore: registered new interface driver hub [0.329802] usbcore: registered new device driver usb [0.330683] omap_i2c 44e0b000. i2c: cocould not find pctldev for node/pinmux @ 44e10800/pinmux_i2c0_pins, deferring probe [0.330726] platform 44e0b000. i2c: Driver omap_i2c requests probe deferral [0.330784] omap_i2c 4802a000. i2c: cocould not find pctldev for node/pinmux @ 44e10800/pinmux_i2c1_pins, deferring probe [0.330808] platform 4802a000. i2c: Driver omap_i2c requests probe deferral [0.335082] Switched to clocksource timer1 [0.480572] NET: Registered protocol family 2 [0.482404] TCP established hash table entries: 4096 (order: 2, 16384 bytes) [0.482587] TCP bind hash table entries: 4096 (order: 5, 147456 bytes) [0.483951] TCP: Hash tables configured (established 4096 bind 4096) [0.484145] TCP: reno registered [0.484169] UDP hash table entries: 256 (order: 2, 20480 bytes) [0.484359] UDP-Lite hash table entries: 256 (order: 2, 20480 bytes) [0.485643] NET: Registered protocol family 1 [0.487595] RPC: Registered named UNIX socket transport module. [2, 0.487618] RPC: Registered udp transport module. [0.487628] RPC: Registered tcp transport module. [0.487637] RPC: Registered tcp NFSv4.1 backchannel transport module. [0.488910] hw perfevents: enabled with armv7_cortex_a8 PMU driver, 5 counters available [0.493146] futex hash table entries: 256 (order: 2, 16384 bytes) [0.498771] VFS: disk quotas dquot_6.5.2 [0.498919] Dquot-cache hash table entries: 1024 (order 0, 4096 bytes) [0.500956] NFS: registering the id_resolver key type [0.501307] Key type id_resolver registered [0.501322] Key type id_legacy registered [0.501464] jffs2: version 2.2. (NAND) (SUMMARY) leakage 2001-2006 Red Hat, Inc. [0.501877] msgmni has been set to 978 [0.507196] io scheduler noop registered [0.507232] io scheduler deadline registered [0.507301] io scheduler cfq registered (default) [2, 0.509624] pinctrl-single 44e10800. pinmux: 142 pins at pa f9e10800 size 568 [0.513086] Serial: 8250/16550 driver, 4 ports, IRQ sharing enabled [0.519109] omap_uart 44e09000. serial: no wakeirq for uart0 [0.519691] 44e09000. serial: ttyO0 at MMIO 0x44e09000 (irq = 88, base_baud = 3000000) is a OMAP UART0 [1.212068] console [ttyO0] enabled [1.221114] omap_rng 4832.16.rng: OMAP Random Number Generator. 20 [1.253833] brd: module loaded [1.273197] loop: module loaded [1.279721] mtdoops: mtd device (mtddev = name/number) must be supplied [1.289621] usbcore: registered new interface driver asix [1.295487] usbcore: registered new interface driver ax88179_178a [1.301980] usbcore: registered new interface driver cdc_ether [1.308269] usbcore: registered new interface driver smsc95xx [1.314388] usbcore: registered new interface driver net1080 [1.320444] usbcore: registered new interface driver cdc_subset [1.326767] usbcore: registered new interface driver zaurus [1.332806] usbcore: registered new interface driver cdc_ncm [1.340919] usbcore: registered new interface driver cdc_wdm [1.347170] usbcore: registered new interface driver usb-storage [1.353622] usbcore: registered new interface driver usbtest [1.364045] mousedev: PS/2 mouse device common for all mice [1.374760] omap_rtc 44e3e000. rtc: rtc core: registered 44e3e000. rtc as rtc0 [1.382981] i2c/dev entries driver [1.386769] Driver for 1-wire Dallas network protocol. [1.398911] omap_wdt: OMAP Watchdog Timer Rev 0x01: initial timeout 60 sec [1.408869] omap_hsmmc 48060000.mmc: unable to get vmmc regulator-517 [1.416459] platform extends Driver omap_hsmmc requests probe deferral [1.424503] ledtrig-cpu: registered to indicate activity on CPUs [1.431429] usbcore: registered new interface driver usbhid [1.437293] usbhid: usb hid core driver [1.442582] oprofile: using arm/armv7 [1.447131] TCP: cubic registered [1.450611] Initializing XFRM netlink socket [1.455238] NET: Registered protocol family 17 [1.459968] NET: Registered protocol family 15 [1.465016] Key type dns_resolver registered [1.469680] protocol: voltage driver support not added [1.476366] handle: No voltage domain specified for smartreflex0.cannot initialize [1.484816] handle: No voltage domain specified for smartreflex1. Cannot initialize [1.494347] ThumbEE CPU extension supported. [1.498923] Registering SWP/SWPB emulation handler [1.503942] SmartReflex Class3 initialized [1.517159] omap-gpmc 50000000. gpmc: GPMC revision 6.0 [1.524094] nand: device found, Manufacturer ID: 0xec, Chip ID: 0xd3 [1.530939] nand: Samsung NAND 1GiB 3,3 V 8-bit [1.535638] nand: 1024MiB, SLC, page size: 2048, OOB size: 64 [1.541640] nand: error: CONFIG_MTD_NAND_OMAP_BCH not enabled [1.547760] omap2-nand: probe of omap2-nand.0 failed with error-22 [1.663619] tps65910 0-002d: No interrupt support, no core IRQ [1.680749] vrtc: 1800 mV [1.684124] vrtc: supplied by vbat [1.691498] vio: at 1500 mV [1.694737] vio: supplied by vbat [1.701644] vdd_mpu: 912 <--> 1312 mV at 1325 mV [1.706882] vdd_mpu: supplied by vbat [1.713875] vdd_core: 912 <--> 1150 mV at 1137 mV [1.719187] vdd_core: supplied by vbat [1.725964] vdd3: 5000 mV [1.731302] vdig1: at 1800 mV [1.734706] vdig1: supplied by vbat [1.741264] vdig2: at 1800 mV [1.744671] vdig2: supplied by vbat [1.751054] vpll: at 1800 mV [1.754365] vpll: supplied by vbat [1.760730] vdac: at 1800 mV [1.764036] vdac: supplied by vbat [1.770317] vaux1: at 1800 mV [1.773717] vaux1: supplied by vbat [1.780114] vaux2: at 3300 mV [1.783514] vaux2: supplied by vbat [1.789893] vaux33: at 3300 mV [1.793397] vaux33: supplied by vbat [1.799920] vmmc: 1800 <--> 3300 mV at 3300 mV [1.804999] vmmc: supplied by vbat [1.810938] vbb: at 3000 mV [1.814411] vbb: supplied by vbat [1.819729] omap_i2c 44e0b000. i2c: bus 0 rev0.11 at 400 kHz [1.833220] omap_i2c 4802a000. i2c: bus 1 rev0.11 at 100 kHz [1.877209] UBI error: ubi_init: cannot open mtd 9, error-19 [1.944943] davinci_mdio 4a101000. mdio: davinci mdio revision 1.6 [1.951329] davinci_mdio 4a101000. mdio: detected phy mask ffffffde [1.961340] libphy: 4a101000. mdio: probed [1.965645] davinci_mdio 4a101000. mdio: phy [0]: device 4a101000. mdio: 00, driver unknown [1.974006] davinci_mdio 4a101000. mdio: phy [5]: device 4a101000. mdio: 05, driver unknown [1, 1.983572] cpsw 4a100000. ethernet: Detected MACID = c4: ed: ba: 88: b5: e4 [1.994560] input: volume_keys @ 0 as/devices/volume_keys @ 0/input/input0 [2.005474] omap_rtc 44e3e000. rtc: setting system clock to 00:00:00 UTC (946684800) [2.014497] sr_init: No PMIC hook to init smartreflex [2.020120] sr_init: platform driver register failed for SR [2.043081] lis3_reg: disabling [2.049937] UBIFS error (pid 1): ubifs_mount: cannot open "ubi0: rootfs", error-19 [2.058011] VFS: Cannot open root device "ubi0: rootfs "or unknown-block (2.066393): error-19 [] Please append a correct" root = "boot option; here are the available partitions: [2.075257] Kernel panic-not syncing: VFS: Unable to mount root fs on unknown-block (2.083990) [] --- [end Kernel panic-not syncing: VFS: unable to mount root fs on unknown-block (0, 0)

(7) Summary

From the startup Log, we can easily see that the kernel cannot be mounted to the root file system. In the next article, I will create the root file system.

Author: girlkoo

Link: http://blog.csdn.net/girlkoo/article/details/41223733