On 4/20/22 01:01, Tom Rini wrote:
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.schucha...@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.schucha...@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?


Yes, it is like appending an initrd to a kernel.

Best regards

Heinrich

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