• Waldemar Brodkorb's avatar
    MIPS: BCM47xx: Add NVRAM support devices · 121915c4
    Waldemar Brodkorb authored
    When trying to netboot a Linksys WRT54GS WLAN router, the bootup fails,
    because of following error message:
    
    ...
    [    0.424000] b44: b44.c:v2.0
    [    0.424000] b44: Invalid MAC address found in EEPROM
    [    0.432000] b44 ssb0:1: Problem fetching invariants of chip,aborting
    [    0.436000] b44: probe of ssb0:1 failed with error -22
    ...
    
    The router uses a CFE bootloader, but most of the needed environment
    variables for network card initialization, are not available from CFE
    via printenv and even though not via cfe_getenv().
    The required environment variables are saved in a special partition
    in flash memory. The attached patch implement nvram_getenv and enables
    bootup via NFS root on my router.
    
    Most of the patch is extracted from the OpenWrt subversion repository and
    stripped down and cleaned up to just fix this issue.
    
    [Ralf: sorted out header file inclusions.  Lots of unneded headers and such
    that should have been included.]
    Signed-off-by: default avatarWaldemar Brodkorb <wbx@openadk.org>
    Reviewed-by: default avatarPhil Sutter <phil@nwl.cc>
    To: linux-mips@linux-mips.org
    Cc: Hauke Mehrtens <hauke@hauke-m.de>
    Patchwork: http://patchwork.linux-mips.org/patch/1359/Signed-off-by: default avatarRalf Baechle <ralf@linux-mips.org>
    121915c4
nvram.h 978 Bytes