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

[Heinrich Schuchardt]

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.

Best regards

Heinrich

 >
 > Regards,
 > Simon