[meta-xilinx] u-boot/UBIFS

[Mike Looijmans]

On 22-09-15 00:30, Edward Wingate wrote:
...
> 4) I am now considering placing the bitstream in the RFS and letting
> Linux load the FPGA on boot up instead of having the FSBL load it.
> Then any updates to the bitstream can just be a file operation as
> well.

It's my preferred way of doing this. The bitstream compresses well, so storing 
it in (LZO compressed) ubifs usually reduces it from 5MB to something like 
600kB. And indeed it makes changing it rather simple.

I wouldn't go for "ping pong" upgrades any sooner than really needed. I use it 
for example for medical devices that must be updated in the field and have no 
method of unbricking them - other than JTAG or so - in case of power out 
during upgrade.

If you can "unbrick" it (e.g. using SD card) with little effort, the overhead 
of a "dual" image is way too much to justify using it. UBI is very reliable 
and will withstand unexpected power loss and similar problems quite well.



Kind regards,

Mike Looijmans
System Expert

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