Re: [ts-7000] Re: ts-7800 boot from SD card

[David Smead <>]

Derek,

It leaves booting from nand without me typing exit and continues with the SD card.  In fact I need that behavior because the unit can be shutoff and powered on with a root terminal.

The one card I have boots directly from the SD card.  The "cloned" card goes to nand and then to the card.

DaveS

On Thu, Mar 11, 2010 at 9:57 PM, Derek <> wrote:

 

--- In ts-7000%40yahoogroups.com, David Smead <> wrote:
>
> I have a ts-7800 that boots from an SD card. I made a copy of that
> card, using dd for partitions 1 and 2. I made partition 3 an ext3,
> and partition 4 a jfs, per the original SD card. Then I used cp -au
> <src card> <target card> for partitions 3 and then 4.
>
> The card I made will only work if I remove the jumper that tells the
> ts7800 to boot from the card. Without the jumper, the unit boots from
> nand and then the SD card. While I can use it that way, I'm trying to
> understand what the difference might be, because I must be doing
> something wrong.
>
> BTW, I can't use dd on partition 4, because the target card is smaller
> than the source card, although both are 2 GB. I've tried on 4
> different SD targets. All the cards are SanDisk.
>
> I asked Derek at Technologic why it can boot through nand first and
> then the card, but not the card directly. He hasn't answered me so I
> hope someone here can offer some clues.
>
> Thanks.
>
> DaveS
>

Dave,

That's certainly normal behavior and there isn't a need for alarm. The TS-BOOTROM bootloader looks for that jumper and if it's on, it'll boot from the SD card (kernel and all) if not, then it'll boot from the NAND flash. When 'exit' is typed from NAND flash, then the linuxrc script will look for an SD card to load the full Debian filesystem. Section 2.4 of the manual gives a little extra detail of the boot process:
http://www.embeddedarm.com/about/resource.php?item=393#section2.4

Best Regards,
Derek Hildreth
Embedded Systems Engineer
Technologic Systems

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