Am 20.09.2013 19:03, schrieb Stephen Warren:
On 09/20/2013 10:37 AM, Dirk Behme wrote:
Am 20.09.2013 18:05, schrieb Stephen Warren:
On 09/18/2013 11:22 PM, Dirk Behme wrote:
...
If you have an embedded system were you just care a little about boot
time you don't want to do anything like U-Boot's "part uuid" every time
you boot. Or even worse, you just have a minimalistic boot loader (e.g.
U-Boot's SPL) which doesn't know anything about UUIDs and file systems.
As mentioned above, no I don't think UUIDs work for production embedded
systems.
As I said above, whatever generates the filesystem image can easily
embed the appropriate UUID in the system's boot scripts or bootloader
environment. There's no need to run the "part" command at run-time if
there's a more appropriate flow for your situation.
Using a simple boot loader as an example, there are no boot scripts or
boot loader environment. The only thing the boot loader does is loading
the device tree and the kernel into RAM. Where do you want to embed an
UUID in such a product?
I think the initrd would be typical.
An embedded system typically doesn't have an initrd. The kernel boots
directly into the rootfs on SD/eMMC.
To my understanding, the UUID is different for each SD card/eMMC, correct?
Yes by default.
Although for an embedded product with a fixed eMMC, there's no reason
you couldn't make every device have the same UUID for the fixed device.
How do you make the eMMC on 1000 boards have the same UUID?
How do you ensure that this eMMC is enumerated as mmcblk0, always?
Independent if there is a SD card in the second/removable slot at boot
time or not?
Best regards
Dirk
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