From: William Hermans <[email protected]>
Reply-To: <[email protected]>
Date: Monday, April 28, 2014 at 8:58 AM
To: <[email protected]>
Subject: Re: [beagleboard] Re: Booting Archlinux from microSD (again)
> Last time I bothered to look at the uboot source code I am fairly sure uSD was
> the first in the roundrobin.
Look at the BBB schematics. On page 6, there is a table and it shows the
boot sequence.
Regards,
John
>
>
> Regardless, I have a board booted now that has Angstrom on the eMMC still, and
> uboot MLO, plus the kernel on uSD, with the rootfs on an NFS server. Freshly
> built a week or two ago.
>
> $ uname -a
> Linux arm 3.8.13-bone47 #1 SMP Mon Apr 14 04:38:52 MST 2014 armv7l GNU/Linux
> $ df -h /
> Filesystem Size Used Avail Use% Mounted on
> 192.168.0.1:/home/william/rootfs 49G 4.9G 41G 11% /
> $ nano /boot/uboot/uEnv.txt
>
> kernel_file=zImage
> initrd_file=uInitrd
>
> serverip=192.168.0.1
> ipaddr=192.168.0.2
> static_ip=192.168.0.2:192.168.0.1:192.168.0.1:255.255.255.0:arm
> rootpath=/home/william/rootfs,rsize=16384,wsize=16384
> console=ttyO0,115200n8
> optargs=ipv6.disable=1
>
> #mmcroot=/dev/mmcblk0p2 ro
> #mmcrootfstype=ext4 rootwait fixrtc
>
> loadkernel=load mmc ${mmcdev}:${mmcpart} 0x80200000 ${kernel_file}
> loadinitrd=load mmc ${mmcdev}:${mmcpart} 0x81000000 ${initrd_file}; setenv
> initrd_size ${filesize}
> loadfdt=load mmc ${mmcdev}:${mmcpart} 0x815f0000 /dtbs/${fdtfile}
>
> #mmcargs=setenv bootargs console=${console} root=${mmcroot}
> rootfstype=${mmcrootfstype}
> netargs=setenv bootargs console=${console} ${optargs} root=/dev/nfs
> nfsroot=${serverip}:${rootpath},vers=3 rw iip=${static_ip}
>
> #just zImage
> boot_ftd=run loadkernel; run loadfdt
> uenvcmd=run boot_ftd; run netargs; bootz 0x80200000 - 0x815f0000
>
> #zImage + uInitrd: where uInitrd has to be generated on the running system.
> #boot_ftd=run loadkernel; run loadinitrd; run loadfdt
> #uenvcmd=run boot_ftd; run mmcargs; bootz 0x80200000 0x81000000:${initrd_size}
> 0x815f0000
>
> NOTE: The above uEnv.txt file is /was provided by none other than Robert C
> Nelson answering the OP's post here. Slightly modified by myself of course.
> THis causes the BBB to "boot" from the uSD card, then mount the rootfs over
> our network provided by a Debian NFS server. Allso, YES optargs=ipv6.disable=1
> does work . .
>
> Anyway, yes you're only spinning your wheels until you get a FTDI cable /
> module hooked up. OR If you have a MSP430 Launchpad v1.5, and are in a hurry,
> I could link you to a post I made about using the Launchpad instead. However
> this may not work depending on how far into the boot process you're getting.
> As uboot is hardcoded to use 115200 bps when it first starts up. The launchpad
> is only capable of 9600 bps.
>
>
> On Mon, Apr 28, 2014 at 7:38 AM, Doug <[email protected]> wrote:
>> Robert, yes, that is my conclusion and I will report back after we get more
>> information. Thanks.
>>
>>
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>
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