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by yjftsjthsd-h
15 days ago
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> We've never used the term custom ROM since it isn't accurate and propagates misconceptions. It's best to avoid it. It's a ROM (in the phone sense), and it's not stock (so installing it is a customization). In what way is it not a custom ROM? |
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There are multiple ROMs involved but GrapheneOS isn't one. There's an SoC boot ROM which loads SoC firmware from the SSD, verifies it and transfers control to it. The littlekernel-based firmware stage which loads GrapheneOS isn't a ROM. GrapheneOS and most of the SoC firmware are simply stored on SSD partitions. There are A/B partitions for both the SoC firmware and the OS on the SSD. Installing (flashing) GrapheneOS involves writing out images to those partitions on the SSD and erasing an existing data partition which also happens as part of unlocking or locking the device. Those partitions aren't read-only from an OS perspective. Verified boot secures what's stored on those, not any form of hardware or firmware level write protection.
There are also boot ROMs for other hardware components. Many of those are responsible for receiving firmware uploaded by the OS to the hardware component at boot, verifying it and transferring control to it. The secure element has separate persistent firmware with a separate verified boot process since the OS isn't allowed to update it until the Owner user has successfully authenticated so it needs persistent firmware. Other hardware components mostly don't need persistent firmware and it's more secure if they don't have it.
> it's not stock
GrapheneOS will be available as the stock OS on multiple Motorola Mobility devices based on our partnership. It won't necessarily be available as the stock OS when the official support for it launches since it's not one of the minimum requirements but it's planned.
> so installing it is a customization
It's a separate OS forked from the Android Open Source Project but this terminology gives many people the incorrect impression that it's a modification of the stock OS. It leads to many people asking questions about what it removes from the stock OS and believing we removed Google integration when that was never present in the baseline. There are a lot of misconceptions which are propagated by this terminology. We don't use it and think it only serves to create unnecessary confusion and misconceptions.
> In what way is it not a custom ROM?
It was just never accurate terminology for forks of the Android Open Source Project on modern devices. The terminology originates from phone modding prior to Android and there was a time it made sense. It hasn't made sense for a long time.