[U-Boot] i.MX35PDK: Starting U-Boot from serial NOR-Flash

[Stefano Babic]

On 02/08/2012 14:55, Fabio Estevam wrote:
> On 8/2/12, Michael Hornung <mhornung.linux at gmail.com> wrote:
>> Hi Fabio,
>>

Hi Michael,


>> Starting kernel ...
>>
>> Uncompressing
>> Linux......................................................................................................................................
>> done, booting the kernel.
>>
>> And that's it, no more kernel output.

At this point, there is no difference for u-boot starting the kernel if
it has booted in external or internal mode. It seems an unrelated issue.

On mx35pdk you can reset the board without powerd off. You should check
the address in kernel for the log buffer (__log_buf in System.map) and
then check it after a reset in u-boot with the "md" command. If we are
lucky, the RAM does not lose its values. Better will be if you have a
JTAG debugger and can you check inside memory directly when the kernel
hangs without rebooting.

>>
>> Here my environment
>>
>> addip=if test -n ${ipdyn};then run addip_dyn;else run addip_sta;fi
>> addip_dyn=setenv bootargs ${bootargs} ip=dhcp
>> addip_sta=setenv bootargs ${bootargs}
>> ip=${ipaddr}:${serverip}:${gatewayip}:${netmask}:${hostname}:${netdev}:off
>> panic=1
>> addmisc=setenv bootargs ${bootargs} ${misc}
>> addmtd=setenv bootargs ${bootargs} ${mtdparts}
>> addtty=setenv bootargs ${bootargs} console=ttymxc0,${baudrate}
>> baudrate=115200
>> bootargs_nfs=setenv bootargs console=ttymxc0,${baudrate} root=/dev/nfs

Depending on the kernel version, ttymxc0 could be wrong. Have you
checked it ?

Best regards,
Stefano Babic

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