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Date: Fri, 15 Mar 2013 08:58:22 -0700
From: Darren Hart <dvhart@linux.intel.com>
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To: Insop Song <insop.song@gmail.com>
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Subject: Re: Loading a new yocto image to Intel Fri2 board
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On 03/15/2013 02:26 AM, Insop Song wrote:
> On Thu, Mar 14, 2013 at 1:15 PM, Darren Hart <dvhart@linux.intel.com> wrote:
>> On 03/14/2013 12:56 PM, Insop Song wrote:
>>> Hi Darren,
>>>
>>> mkefidisk.sh works, thank you.
>>>
>>> What I found was, USB still doesn't work even with mkefidisk.sh.
>>> So I used micro sd card instead.
>>
>> Aha, yes. You will need to add "rootwait" to your kernel command line
>> for reliable booting over usb. There is no way I see to determine if USB
>> is being used (/dev/sda could just as easily be SATA). Perhaps mkefidisk
>> should just use rootwait by default. Patches accepted.
>>
> 
> 
> "rootwait" was there.
> 
> 1. when I run "sudo ~/bin/mkefidisk.sh /dev/sda
> core-image-sato-sdk-fri2-20130309091839.hddimg /dev/mmcblk0"
> but "root=" was set to mmcblk0.
> So I changed "root=" manually to sda2, usb is booted as well.
> 
> yes, I should have put the last parameter to be "/dev/sda" instead..


This also explains why rootwait was there. The script tests for mmcblk0
and sets rootwait if so (if I remember correctly).


> 2. so when I run "sudo ~/bin/mkefidisk.sh /dev/sda
> core-image-sato-sdk-fri2-20130309091839.hddimg /dev/sda"
> USB is also working fine.


Check this image, I think you'll find that rootwait is missing for this
image.


> Thank you very much for the help, now I can use fri2 to test "meta-realtime"
> 
> Insop
> 

Great.

-- 
Darren Hart
Intel Open Source Technology Center
Yocto Project - Technical Lead - Linux Kernel