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.
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.
v2 -> v3:
* Add quotes to 0001 in dependencies. This fixes 'make dt_binding_check'
warning.
v3 -> v4:
* Rename 'amlogic,boot-page-last' to 'amlogic,boot-pages'.
v4 -> v5:
* Update 'description' fields in bindings.
v5 -> v6:
* Split patch for meson_nand.c to 2 patches: first is refactoring of
scrambling mode handling, another is support for special pages for
boot ROM.
* Update description and commit message in the bindings patch.
Arseniy Krasnov (3):
dt-bindings: mtd: amlogic,meson-nand: support fields for boot ROM code
mtd: rawnand: meson: refactor use of 'meson_nfc_cmd_access()'
mtd: rawnand: meson: read/write access for boot ROM pages
.../bindings/mtd/amlogic,meson-nand.yaml | 18 ++++
drivers/mtd/nand/raw/meson_nand.c | 86 +++++++++++++------
2 files changed, 77 insertions(+), 27 deletions(-)
--
2.35.0
