Help in running top of git on Freescale MX28 EVK board

[Sam Gandhi]

On Tue, Sep 6, 2011 at 10:17 AM, Sam Gandhi <samgandhi9 at gmail.com> wrote:
> Hello,
>
> I am trying to boot top of git://linux-arm.org/linux-2.6.git on
> Freescale MX28 EVK board.
> However I am unable to get any output on serial console.
>
> I have attached the .config file that I am using to build this kernel
> if there is a mistake I have done in selecting the configuration. I
> have enabled CONFIG_DEBUG_LL and CONFIG_EARLY_PRINTK and I don't see
> any output on console after kernel start. I have attached the console
> output below
>
> However on the same board I am able to boot 2.6.35 kernel that
> freescale ships, using the same u-boot and command line arguments,
> which are shown below.
>
> console=ttyAM0,115200
> ip=192.168.137.1:192.168.137.254:255.255.255.255:255.255.255.0
> root=/dev/nfs nfsroot=192.168.137.254:/tftpboot/boot/,v3,tcp
>
> I would appreciate pointer to correct .config file to use for
> Freescale MX28 EVK board.
>
>
> PowerPrep start initialize power...
> Battery Voltage = 4.22V
> 5v source detected.Valid battery
> voltage detected.Booting from battery
> voltage .
> Sep  2 201110:29:34
> FRAC 0x92925552
> memory type is DDR2
> Wait for ddr ready 1power 0x00820616
> Frac 0x92925552
> start change cpu freq
> hbus 0x00000003
> cpu 0x00010001
> start test memory accress
> ddr2 0x40000000
> finish simple test
> MACH type is 2531
>
>
> U-Boot 2009.08-svn46031 (Sep 02 2011 - 10:32:17)
>
> Freescale i.MX28 family
> CPU:   454 MHz
> BUS:   151 MHz
> EMI:   205 MHz
> GPMI:   24 MHz
> DRAM:  128 MB
> MMC:   IMX_SSP_MMC: 0, IMX_SSP_MMC: 1
> In:    serial
> Out:   serial
> Err:   serial
> Net:   got MAC address from IIM: 00:04:9f:01:7e:d5
> FEC0
> Warning: FEC0 MAC addresses don't match:
> Address in SROM is         00:04:9f:01:7e:d5
> Address in environment is  00:c0:8a:88:73:73
>
> Hit any key to stop autoboot:  0
> Using FEC0 device
> TFTP from server 192.168.137.254; our IP address is 192.168.137.1
> Filename 'boot/uImage'.
> Load address: 0x42000000
> Loading: FEC: Link is down 7809
> T #################################################################
>         #################################################################
>         ##
> done
> Bytes transferred = 1932328 (1d7c28 hex)
> ## Booting kernel from Legacy Image at 42000000 ...
>   Image Name:   Linux-3.1.0-rc1-07628-g8399b33-d
>   Image Type:   ARM Linux Kernel Image (uncompressed)
>   Data Size:    1932264 Bytes =  1.8 MB
>   Load Address: 40008000
>   Entry Point:  40008000
>   Verifying Checksum ... OK
>   Loading Kernel Image ... OK
> OK
>
> Starting kernel ...
>
> Uncompressing Linux... done, booting the kernel.
>
>

Replying to this thread in case someone else has similar issue.

Problem turned out to be name of the console. When using top of the
git tree one has to provide console=ttyAMA0,115200. When using
freescale's 2.6.35 kernel console had to be console=ttyAM0,115200

Out of curiosity how does one go about finding such device name
changes looking at the git commit log or Documentation ?

Regards,
-Sam