[PATCH 0/2] nvmem: brcm_nvram: use buffered nvram data for cell values

[Willem-Jan de Hoog]

Words from Willem-Jan de Hoog:

On OpenWrt 22.03.3, Asus RT-AC88U does not boot anymore:

  UBI: auto-attach mtd4
  ubi0: attaching mtd4
  ubi0 error: 0xc04f0b3c: PEB 0 contains corrupted VID header, and the
     data does not contain all 0xFF
  ubi0 error: 0xc04f0b4c: this may be a non-UBI PEB or a severe VID
     header corruption which requires manual inspection

The problem seems to be that brcm_nvram_read accesses its (mapped) io
memory. When doing so the correct data is read but after that the
mtd/ubi process fails to work.

The bcm47xx_nvram.c code has buffered the nvram data so the cells value
can be read from there.

Willem-Jan de Hoog (2):
  firmware: bcm47xx_nvram: allow to read from buffered nvram data
  nvmem: brcm_nvram: use bcm47xx buffered data

 drivers/firmware/broadcom/bcm47xx_nvram.c | 14 ++++++++++++++
 drivers/nvmem/brcm_nvram.c                |  8 ++++++++
 include/linux/bcm47xx_nvram.h             |  6 ++++++
 3 files changed, 28 insertions(+)