[PATCH v2 0/2] Meson: R/W support for pages used by boot ROM

Arseniy Krasnov
2024-04-08T09:10:23Z

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-page-last = <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.

Changelog:
v1 -> v2:
* Rename 'meson,boot-page-XXX' -> 'amlogic,boot-page-XXX'.
* Add words that 'amlogic,boot-page-step' is measured in pages.
* Remove words that 'amlogic,boot-page-XXX' depends on 'nand-is-boot-medium'.
* Make both 'amlogic,boot-page-XXX' depend on each other also, in
addition to 'nand-is-boot-medium' dependency.

Arseniy Krasnov (2):
dt-bindings: mtd: amlogic,meson-nand: support fields for boot ROM code
mtd: rawnand: meson: support R/W mode for boot ROM

.../bindings/mtd/amlogic,meson-nand.yaml | 14 +++
drivers/mtd/nand/raw/meson_nand.c | 88 +++++++++++++------
2 files changed, 73 insertions(+), 29 deletions(-)

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2.35.0