[PATCH 1/1] drivers: add memory disk support
Tom Rini
trini at konsulko.com
Wed Apr 20 15:37:38 CEST 2022
On Wed, Apr 20, 2022 at 08:48:28AM +0200, Heinrich Schuchardt wrote:
>
>
> 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.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?
>
> Yes, it is like appending an initrd to a kernel.
I'm not super comfortable with that concept, and want to see the use
case spelled out a lot more.
--
Tom
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