Messages in this thread | | | Date | Mon, 9 Nov 2020 12:58:31 -0500 | From | Vivek Unune <> | Subject | Re: [PATCH v2] ARM: dts: BCM5301X: Linksys EA9500 add fixed partitions |
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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
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