From mboxrd@z Thu Jan  1 00:00:00 1970
From: Chaiken, Alison <alison@she-devel.com>
Date: Thu, 01 Jun 2017 08:06:22 -0700
Subject: [U-Boot] [PATCH v2 5/6] rename GPT partitions to detect boot
	failure
In-Reply-To: <20170601102145.10d96592@jawa>
References: <20170526123845.GI10782@bill-the-cat>
 <1496076573-14495-1-git-send-email-alison@peloton-tech.com>
 <1496076573-14495-6-git-send-email-alison@peloton-tech.com>
 <20170531101246.7e51b038@jawa>
 <8e8e37eb178dc8501a00b4139a95e19e@she-devel.com>
 <20170601102145.10d96592@jawa>
Message-ID: <080df5158b30ff0e86f63ba00eca6132@she-devel.com>
List-Id: <u-boot.lists.denx.de>
MIME-Version: 1.0
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: 7bit
To: u-boot@lists.denx.de

Lukasz Majewski wrote:

> Maybe it would be better to have
> 
> gpt flip mmc 0 <optional parameter 'name'>
> 
> (By default we have "primary" and "backup")
> 
> In that way we could set other names to GPT partitions without the
> need to modify the code.

I answered: 

>> Another possibility is to support
>> 
>> gpt flip mmc 0 <name 1> <name 2>
>> 
>> where two names are required, with defaults 'primary' and 'backup'.   
>> Perhaps I should rework patch 5 that way?

Lukasz responded: 

> Please correct my understanding if I'm wrong.
> 
> You parse GPT partitions to a list and there are only two names
> possible:
> 
> "primary" and "backup".
> 
> When we call gpt filp we rename those names ("primary" -> "backup" and
> the other way).
> 
> Ahhh..... so your patch would allow to rename "primary" to <name1> and
> "backup" to <name2> for all names.
> 
> My idea was rather to have a gpt call to set name of a GPT partition....

> I can image that somebody would like to change on the fly single GPT
> partition name (when having/care about 2 partitions for his/her project
> specific data).
> 
> But, I don't know how much effort it would take to implement it (and if
> others would see it beneficial).

I would propose then two options: 

    gpt rename mmc 0 <name 1> <name 2> 

which renames all the 1's to 2's, and 

    gpt flip mmc 0 <name 1> <name 2> 

which swaps the two name strings for all partitions where they're found.
 These two operations together with 'gpt write' then cover all the
common use cases I can imagine. 

I'm open to any other suggestions, of course.   I just posted what I
already had to get started. 

-- Alison 

---
Alison Chaiken                      alison at she-devel.com, 650-279-5600 
http://{ she-devel.com, exerciseforthereader.org } 
"We are giving up our privacy, one convenience at a time." -- Evangelos
Simoudis