On Mon, Nov 09, 2020 at 06:28:38PM +0100, Rafał Miłecki wrote:
> On 01.11.2020 21:08, Vivek Unune wrote:
> > This router has dual paritions to store trx firmware image and
> > dual partitions for nvram. The second one in each of these cases acts
> > as a backup store.
>
> I'm quite sure CFE is supposed to flash new firmware to the backup
> partition and then mark it as main one. The old firmware partition becomes a
> new backup then.
>
> That means you need to check which partition bootloader used to handle
> partitioning properly.
>
>
> > + partition@200000 {
> > + label = "firmware";
> > + reg = <0x0200000 0x01D00000>;
> > + compatible = "brcm,trx";
> > + };
> > +
> > + partition@1F00000 {
> > + label = "failsafe";
> > + reg = <0x01F00000 0x01D00000>;
> > + read-only;
> > + };
>
> Here you assume CFE always boots from the first firmware partition.
>
> Unless EA9500 CFE does sth stupid it seems like a 50% - 50% guess.
Hi Rafał,
Indeed, my assumption is to only boot using first partition.
If we ever want to support true dual partitions in future, we need to:
1. Read the boot flag 'bootpartition' and skip the backup partition parsing
2. Updagrading firmware will write to backup partition and flip the bootpartition
Thanks,
Vivek
