[U-Boot] Weird problem with kernel/initrd loading

[Ioannis Kyriakopoulos]

Hi all,

 

I have a query regarding the boot of an initrd with U-boot. ASAIK,
ramdisk.gz should be converted to a type supported  by U-boot with the use
of mkimage tool (with a -T ramdisk switch). Also, the "bootm" command should
be invoked by passing the address of uImage first and then the address of
ramdisk.gz as it is mentioned here
http://www.denx.de/wiki/DULG/UBootCmdGroupExec. However, in this case I get
the following output and the kernel can't recognize/mount the ramdisk.

 

OMAP3 beagleboard.org # setenv bootargs 'console=ttyS2,115200n8,
root=/dev/ram0 rw initrd=0x81600000,8M, init=/linuxrc'

OMAP3 beagleboard.org # mmcinit; fatload mmc 0 0x80002000 uImage; fatload
mmc 0 0x81600000 ramdisk.gz; bootm 0x80002000 0x81600000

reading uImage

 

1950244 bytes read

reading ramdisk.gz

 

2910640 bytes read

## Booting kernel from Legacy Image at 80002000 ...

   Image Name:   Linux-2.6.32-rc7

   Image Type:   ARM Linux Kernel Image (uncompressed)

   Data Size:    1950180 Bytes =  1.9 MB

   Load Address: 80008000

   Entry Point:  80008000

   Verifying Checksum ... OK

## Loading init Ramdisk from Legacy Image at 81600000 ...

   Image Name:   my_ramdisk

   Image Type:   ARM Linux RAMDisk Image (gzip compressed)

   Data Size:    2910576 Bytes =  2.8 MB

   Load Address: 00000000

   Entry Point:  00000000

   Verifying Checksum ... OK

   Loading Kernel Image ... OK

OK

 

Starting kernel ...

 

Uncompressing
Linux.......................................................................
.................................................. done, booting the kernel.

[    0.000000] Linux version 2.6.32-rc7 (limp at ubuntu) (gcc version 4.4.1
(Sourcery G++ Lite 2009q3-67) ) #1 Thu Nov 26 12:32:47 GMT 2009

[    0.000000] CPU: ARMv7 Processor [411fc083] revision 3 (ARMv7),
cr=10c53c7f

[    0.000000] CPU: VIPT nonaliasing data cache, VIPT nonaliasing
instruction cache

[    0.000000] Machine: OMAP3 Beagle Board

[    0.000000] Memory policy: ECC disabled, Data cache writeback

[    0.000000] OMAP3430 ES3.0

[    0.000000] SRAM: Mapped pa 0x40200000 to va 0xe3000000 size: 0x100000

[    0.000000] Built 1 zonelists in Zone order, mobility grouping on.  Total
pages: 65024

[    0.000000] Kernel command line: console=ttyS2,115200n8, root=/dev/ram0
rw initrd=0x81600000,8M, init=/linuxrc

[    0.000000] PID hash table entries: 1024 (order: 0, 4096 bytes)

[    0.000000] Dentry cache hash table entries: 32768 (order: 5, 131072
bytes)

[    0.000000] Inode-cache hash table entries: 16384 (order: 4, 65536 bytes)

[    0.000000] Memory: 128MB 128MB = 256MB total

[    0.000000] Memory: 247552KB available (3332K code, 307K data, 120K init,
0K highmem)

[    0.000000] Hierarchical RCU implementation.

[    0.000000] NR_IRQS:402

[    0.000000] Clocking rate (Crystal/Core/MPU): 26.0/332/500 MHz

[    0.000000] Reprogramming SDRC clock to 332000000 Hz

[    0.000000] GPMC revision 5.0

[    0.000000] IRQ: Found an INTC at 0xd8200000 (revision 4.0) with 96
interrupts

[    0.000000] Total of 96 interrupts on 1 active controller

[    0.000000] OMAP34xx GPIO hardware version 2.5

[    0.000000] OMAP clockevent source: GPTIMER1 at 13000000 Hz

[    0.000000] Console: colour dummy device 80x30

[    0.000000] Calibrating delay loop... 498.07 BogoMIPS (lpj=2490368)

[    0.000000] Mount-cache hash table entries: 512

[    0.000000] CPU: Testing write buffer coherency: ok

[    0.000000] regulator: core version 0.5

[    0.000000] NET: Registered protocol family 16

[    0.000000] Found NAND on CS0

[    0.000000] Registering NAND on CS0

[   28.064483] OMAP DMA hardware revision 4.0

[   28.080444] bio: create slab <bio-0> at 0

[   28.083923] SCSI subsystem initialized

[   28.084747] usbcore: registered new interface driver usbfs

[   28.085235] usbcore: registered new interface driver hub

[   28.085540] usbcore: registered new device driver usb

[   28.086151] i2c_omap i2c_omap.1: bus 1 rev3.12 at 2600 kHz

[   28.089538] twl4030: PIH (irq 7) chaining IRQs 368..375

[   28.089569] twl4030: power (irq 373) chaining IRQs 376..383

[   28.090026] twl4030: gpio (irq 368) chaining IRQs 384..401

[   28.091735] regulator: VUSB1V5: 1500 mV normal standby

[   28.092315] regulator: VUSB1V8: 1800 mV normal standby

[   28.092895] regulator: VUSB3V1: 3100 mV normal standby

[   28.094299] twl4030_usb twl4030_usb: Initialized TWL4030 USB module

[   28.095184] regulator: VMMC1: 1850 <--> 3150 mV normal standby

[   28.095794] regulator: VDAC: 1800 mV normal standby

[   28.096374] regulator: VPLL2: 1800 mV normal standby

[   28.096984] regulator: VSIM: 1800 <--> 3000 mV normal standby

[   28.097167] i2c_omap i2c_omap.3: bus 3 rev3.12 at 100 kHz

[   28.099304] Switching to clocksource gp timer

[   28.102264] musb_hdrc: version 6.0, musb-dma, otg (peripheral+host),
debug=0

[   28.104858] musb_hdrc: USB OTG mode controller at d80ab000 using DMA, IRQ
92

[   28.105468] NET: Registered protocol family 2

[   28.105682] IP route cache hash table entries: 2048 (order: 1, 8192
bytes)

[   28.106262] TCP established hash table entries: 8192 (order: 4, 65536
bytes)

[   28.106536] TCP bind hash table entries: 8192 (order: 3, 32768 bytes)

[   28.106719] TCP: Hash tables configured (established 8192 bind 8192)

[   28.106750] TCP reno registered

[   28.106964] NET: Registered protocol family 1

[   28.107391] RPC: Registered udp transport module.

[   28.107391] RPC: Registered tcp transport module.

[   28.107421] RPC: Registered tcp NFSv4.1 backchannel transport module.

[   28.107666] Trying to unpack rootfs image as initramfs...

[   28.107971] rootfs image is not initramfs (junk in compressed archive);
looks like an initrd

[   28.154846] Freeing initrd memory: 8192K

[   28.155548] NetWinder Floating Point Emulator V0.97 (double precision)

[   28.157684] VFS: Disk quotas dquot_6.5.2

[   28.157775] Dquot-cache hash table entries: 1024 (order 0, 4096 bytes)

[   28.158996] NTFS driver 2.1.29 [Flags: R/O].

[   28.159301] JFFS2 version 2.2. (NAND) © 2001-2006 Red Hat, Inc.

[   28.160034] msgmni has been set to 499

[   28.161315] alg: No test for stdrng (krng)

[   28.161407] io scheduler noop registered

[   28.161437] io scheduler anticipatory registered (default)

[   28.161437] io scheduler deadline registered

[   28.161621] io scheduler cfq registered

[   28.162353] omapfb: configured for panel omap3beagle

[   28.172393] omapfb: DISPC version 3.0 initialized

[   28.186523] Console: switching to colour frame buffer device 128x48

[   28.199157] omapfb: Framebuffer initialized. Total vram 1572864 planes 1

[   28.199188] omapfb: Pixclock 48000 kHz hfreq 44.7 kHz vfreq 57.7 Hz

[   28.218811] Serial: 8250/16550 driver, 4 ports, IRQ sharing enabled

[   28.241882] serial8250.0: ttyS0 at MMIO 0x4806a000 (irq = 72) is a
ST16654

[   28.262725] serial8250.1: ttyS1 at MMIO 0x4806c000 (irq = 73) is a
ST16654

[   28.283538] serial8250.2: ttyS2 at MMIO 0x49020000 (irq = 74) is a
ST16654

[   28.754913] console [ttyS2] enabled

[   28.759857] brd: module loaded

[   28.768463] loop: module loaded

[   28.772796] usbmon: debugfs is not available

[   28.777099] Initializing USB Mass Storage driver...

[   28.782531] usbcore: registered new interface driver usb-storage

[   28.788604] USB Mass Storage support registered.

[   28.793304] i2c /dev entries driver

[   28.910125] TCP cubic registered

[   28.913391] NET: Registered protocol family 17

[   28.917907] NET: Registered protocol family 15

[   28.922515] Power Management for TI OMAP3.

[   28.926818] VFP support v0.3: implementor 41 architecture 3 part 30
variant c rev 1

[   28.936676] regulator_init_complete: incomplete constraints, leaving VDVI
on

[   28.943908] regulator_init_complete: incomplete constraints, leaving VDAC
on

[   28.951171] drivers/rtc/hctosys.c: unable to open rtc device (rtc0)

[   28.957794] RAMDISK: Couldn't find valid RAM disk image starting at 0.

[   28.969543] List of all partitions:

[   28.973083] No filesystem could mount root, tried:  ext3 ext2 vfat msdos
ntfs

[   28.980346] Kernel panic - not syncing: VFS: Unable to mount root fs on
unknown-block(1,0)

 

The weird thing is that by using the very same uImage and ramdisk.gz but
without using the mkimage tool to convert ramdisk.gz to a U-boot compatible
type and without passing the ramdisk.gz memory address at "bootm" command,
the filesystem gets mounted and the kernel boots successfully. 

 

Does anyone has any clue of what is getting wrong in the first case?

 

Thanks in advance.