Re: [U-Boot] [PATCH 0/3] add support for GPT partition name manipulation

[Tom Rini]

On Sat, May 20, 2017 at 07:27:52PM -0700, ali...@peloton-tech.com wrote:

> From: Alison Chaiken 
> 
> One way for userspace and the bootloader to exchange information about
> dynamic image selection is via the storage device partition table, as
> described at
> 
> https://source.android.com/devices/tech/ota/ab_updates
> 
> The scheme described there relies on setting partitions' "boot" flag.
> When no partition on a device is bootable since the kernel and U-Boot
> are stored elsewhere, the name field in the GPT partition table offers
> another logical place to store information.  These patches allow users
> to easily modify GPT partition names via bootscripts that can select
> different images based on a boot-failure counter, or when userspace
> installs a software update.
> 
> These patches have been tested on a TI DRA7xx-based SOM with U-Boot
> 2015.07.  The storage device is an eMMC.
> 
> Alison Chaiken (3):
>   GPT: add accessor function for disk GUID
>   GPT: read partition table from device into a data structure
>   rename GPT partitions to detect boot failure
> 
>  cmd/gpt.c   | 339 
> +++-
>  disk/part_efi.c |  31 ++
>  include/part.h  |  24 
>  3 files changed, 392 insertions(+), 2 deletions(-)

Interesting.  Adding Lukasz for comments as well.  I was thinking
perhaps the final patch in the series might want to be guarded with some
Kconfig option as it's rather specific to this update mechanism and
probably causes a noticeable size increase due to the strings.  Thanks!

-- 
Tom


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[U-Boot] [PATCH 0/3] add support for GPT partition name manipulation

[alison]

From: Alison Chaiken 

One way for userspace and the bootloader to exchange information about
dynamic image selection is via the storage device partition table, as
described at

https://source.android.com/devices/tech/ota/ab_updates

The scheme described there relies on setting partitions' "boot" flag.
When no partition on a device is bootable since the kernel and U-Boot
are stored elsewhere, the name field in the GPT partition table offers
another logical place to store information.  These patches allow users
to easily modify GPT partition names via bootscripts that can select
different images based on a boot-failure counter, or when userspace
installs a software update.

These patches have been tested on a TI DRA7xx-based SOM with U-Boot
2015.07.  The storage device is an eMMC.

Alison Chaiken (3):
  GPT: add accessor function for disk GUID
  GPT: read partition table from device into a data structure
  rename GPT partitions to detect boot failure

 cmd/gpt.c   | 339 +++-
 disk/part_efi.c |  31 ++
 include/part.h  |  24 
 3 files changed, 392 insertions(+), 2 deletions(-)

-- 
2.1.4

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