[PATCH v2 0/3] Meson: R/W support for pages used by boot ROM
Arseniy Krasnov
avkrasnov at salutedevices.com
Wed Aug 21 22:12:38 CEST 2024
Hi, sorry, pls ping 😄
Thanks
On 08.07.2024 10:13, Arseniy Krasnov wrote:
> Patchset is based on patchset for Linux (today merged to nand-next):
> https://lore.kernel.org/linux-mtd/20240507230903.3399594-1-avkrasnov@salutedevices.com/
>
> Here is description from it:
>
> > Amlogic's boot ROM code needs that some pages on NAND must be written
> > in special "short" ECC mode with scrambling enabled. Such pages:
> > 1) Contain some metadata about hardware.
> > 2) Located with some interval starting from 0 offset, until some
> > specified offset. Interval and second offset are set in the
> > device tree.
> >
> > This patchset adds R/W support for such pages. To enable it we can setup
> > it in dts:
> >
> > nand-is-boot-medium;
> > amlogic,boot-pages = <1024>;
> > amlogic,boot-page-step = <128>;
> >
> > It means that each 128th page in range 0 to 1024 pages will be accessed
> > in special mode ("short" ECC + scrambling). In practice this feature is
> > needed when we want to update first block of NAND - driver will enable
> > required mode by itself using value from device tree.
>
> The only difference is that patchset for Linux updates DT bindings, while
> this adds NAND_IS_BOOT_MEDIUM flag support.
>
> Changelog:
> v1 -> v2:
> * Pls see per-patch changelog.
>
> Arseniy Krasnov (3):
> mtd: rawnand: nand_base: support for 'NAND_IS_BOOT_MEDIUM' flag
> mtd: rawnand: meson: refactor use of 'meson_nfc_cmd_access()'
> mtd: rawnand: meson: read/write access for boot ROM pages
>
> drivers/mtd/nand/raw/meson_nand.c | 84 +++++++++++++++++++++----------
> drivers/mtd/nand/raw/nand_base.c | 3 ++
> include/linux/mtd/rawnand.h | 5 ++
> 3 files changed, 65 insertions(+), 27 deletions(-)
>
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