linux-kernel - Re: [PATCH] pstore: Add boot loader log messages support

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Date:   Thu, 14 Feb 2019 20:04:58 -0800
From:   Kees Cook <keescook@...omium.org>
To:     Yue Hu <huyue2@...ong.com>
Cc:     Anton Vorontsov <anton@...msg.org>,
        Colin Cross <ccross@...roid.com>,
        Tony Luck <tony.luck@...el.com>,
        LKML <linux-kernel@...r.kernel.org>, Yue Hu <zbestahu@...il.com>
Subject: Re: [PATCH] pstore: Add boot loader log messages support

On Thu, Feb 14, 2019 at 8:01 PM Yue Hu <huyue2@...ong.com> wrote:
> Yes, boot loader will did the _write_. When booting from power on, the first phase
> is boot loader, it will log to specific reserver memory. Then kernel/pstore is
> coming up, pstore will copy the log generated by boot loader to xbl zone. The xbl
> memory zone layout like below:
>
> +-----+---------
> |dest |
> |-----|  xbl zone
> |src  |
> +-----+---------
>
> Anyway, i think it is a useful debug feature.

Ah-ha, interesting. Okay, please mention this (and how the boot loader
knows to write in the area) in v2.

Thanks!

-- 
Kees Cook