[PATCH 1/1] drivers: add memory disk support

[Tom Rini]

On Wed, Apr 20, 2022 at 12:20:43AM +0200, Heinrich Schuchardt wrote:
> On 4/19/22 23:54, Simon Glass wrote:
> > Hi Heinrich,
> >
> > On Tue, 19 Apr 2022 at 15:14, Heinrich Schuchardt
> > <heinrich.schuchardt at canonical.com> wrote:
> >>
> >> In some scenarios it is desirable to package U-Boot with other files into
> >> a single blob. This patch allows to embed a memory disk into the U-Boot
> >> binary. This memory disk can be accessed like any other block
> >> device as 'mem 0'.
> >>
> >> Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt at canonical.com>
> >> ---
> >>   MAINTAINERS                      |   6 ++
> >>   common/board_r.c                 |   4 +
> >>   drivers/Kconfig                  |   2 +
> >>   drivers/Makefile                 |   1 +
> >>   drivers/block/blk-uclass.c       |   2 +
> >>   drivers/memdisk/Kconfig          |  13 ++++
> >>   drivers/memdisk/Makefile         |  11 +++
> >>   drivers/memdisk/memdisk-uclass.c |  22 ++++++
> >>   drivers/memdisk/memdisk.c        | 128 +++++++++++++++++++++++++++++++
> >>   drivers/memdisk/memdisk_file.S   |  17 ++++
> >>   include/asm-generic/sections.h   |   2 +
> >>   include/blk.h                    |   1 +
> >>   include/dm/uclass-id.h           |   1 +
> >>   include/memdisk.h                |  28 +++++++
> >>   14 files changed, 238 insertions(+)
> >>   create mode 100644 drivers/memdisk/Kconfig
> >>   create mode 100644 drivers/memdisk/Makefile
> >>   create mode 100644 drivers/memdisk/memdisk-uclass.c
> >>   create mode 100644 drivers/memdisk/memdisk.c
> >>   create mode 100644 drivers/memdisk/memdisk_file.S
> >>   create mode 100644 include/memdisk.h
> >
> > Can this use binman to create the image and find the memdisk?
> 
> binman requires board specific layout information. I cannot see how binman
> would help for a Kconfig option that can be switched on and off for any
> board.
> 
> binman may provide addresses in the control device-tree which later could be
> relocated. But this seems to result in a larger image size.

This is something analogous to the initrd/initramfs framework within the
Linux kernel, yes?

-- 
Tom
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