Regarding linux porting

[Daniel J Blueman]

On Thu, Oct 29, 2009 at 7:39 AM, Vadivelan M <vadivelan.m at tcs.com> wrote:
> Hi ,
>
> we are porting linux 2.6.27 on imx27 based platform. we did all the platform
> dependent changes .
>
> With this linux is booting till a point and stopping there ..
>
> stopping at
>
> (VFS) Mounting file system
> Freeing init memory
>
> While debugging through printk we could go till
>
> rest_init()  -> kernel _init() -> init_post() --->
>
> Going for opening initial console . .... using sys_open() .... After that no
> prints .......
>
>
> Can any body help us to go forward ?
>
> Thanks in advance ,
> vels
>
>
> Please see the following logs ..
>
> Launch LinuxUncompressing
> Linux......................................................................
> done, booting the kernel.
> Linux version 2.6.28-arm2 (root at localhost.localdomain) (gcc version 4.1.1)
> #75 Wed Oct 28 13:12:53 IST 2009
> CPU: ARM926EJ-S [41069264] revision 4 (ARMv5TEJ), cr=00053177
> CPU: VIVT data cache, VIVT instruction cache
> Machine: Freescale i.MX27ADS
> Memory policy: ECC disabled, Data cache writeback
> Built 1 zonelists in Zone order, mobility grouping on.  Total pages: 16256
> Kernel command line: root=/dev/ram rw mem=64M console=ttymxc0,115200
> MXC GPIO hardware
> MXC IRQ initialized
> PID hash table entries: 256 (order: 8, 1024 bytes)
>
>  Clock input source is 26000000
>
>  After for loop
>  test1
>  CCM_PCCR1 = fe5aef88
>  b4 spll_clk.disableConsole: colour dummy device 80x30
> Dentry cache hash table entries: 8192 (order: 3, 32768 bytes)
> Inode-cache hash table entries: 4096 (order: 2, 16384 bytes)
> Memory: 64MB = 64MB total
> Memory: 60780KB available (1956K code, 252K data, 92K init)
> Calibrating delay loop... 132.71 BogoMIPS (lpj=663552)
> Security Framework initialized
> Mount-cache hash table entries: 512
> CPU: Testing write buffer coherency: ok
> kernel thread started : M.V<5>SCSI subsystem initialized
> checking if image is initramfs...it isn't (no cpio magic); looks like an
> initrd
> do_sys_open entry<6>Freeing initrd memory: 1792K
> NetWinder Floating Point Emulator V0.97 (extended precision)
> VFS: Disk quotas dquot_6.5.1
> Dquot-cache hash table entries: 1024 (order 0, 4096 bytes)
> JFS: nTxBlock = 489, nTxLock = 3914
> msgmni has been set to 122
> io scheduler noop registered
> io scheduler anticipatory registered
> io scheduler deadline registered
> io scheduler cfq registered (default)
> Serial: IMX driver
> imx-uart.0: ttymxc0 at MMIO 0x1000a000 (irq = 20) is a IMX
> console [ttymxc0] enabled
> imx-uart.1: ttymxc1 at MMIO 0x1000b000 (irq = 19) is a IMX
> imx-uart.2: ttymxc2 at MMIO 0x1000c000 (irq = 18) is a IMX
> imx-uart.3: ttymxc3 at MMIO 0x1000d000 (irq = 17) is a IMX
> imx-uart.4: ttymxc4 at MMIO 0x1001b000 (irq = 49) is a IMX
> imx-uart.5: ttymxc5 at MMIO 0x1001c000 (irq = 48) is a IMX
> brd: module loaded
> loop: module loaded
> st: Version 20080504, fixed bufsize 32768, s/g segs 256
> Driver 'st' needs updating - please use bus_type methods
> Driver 'sd' needs updating - please use bus_type methods
> drivers/rtc/hctosys.c: unable to open rtc device (rtc0)
> do_sys_open entrydo_sys_open entry<5>RAMDISK: Compressed image found at
> block 0
> EXT2-fs warning: mounting unchecked fs, running e2fsck is recommended
> VFS: Mounted root (ext2 filesystem).
> Freeing init memory: 92K
>
>
> After this some junk characters are coming like ....
>
> ��֍�򁰠0^ޝ��r�'���ϊ��r:�������:��M� ��D�d�z ?��
> Τ��8V�`�Т���V잊]nn]^ｸ�m8m��^� �m� E��N��8��6���:]���

This is off-topic, so definitely do not include this mailing list in any reply.

The junk characters will be from the serial port output, so it looks
like your system is booting, just the serial port is being setup by
userspace at something other than 115200 baud etc. Here, the kernel
isn't using hardware flow control and is fine.

Daniel
-- 
Daniel J Blueman