1. 24 Jul, 2013 1 commit
  2. 20 Jan, 2011 1 commit
    • Kumar Gala's avatar
      powerpc/8xxx: Add hwconfig APIs to address early parsing used by DDR init · dd50af25
      Kumar Gala authored
      There are several users of the hwconfig APIs (8xxx DDR) before we have
      the environment properly setup.  This causes issues because of the
      numerous ways the environment might be accessed because of the
      non-volatile memory it might be stored in.  Additionally the access
      might be so early that memory isn't even properly setup for us.
      
      Towards resolving these issues we provide versions of all the hwconfig
      APIs that can be passed in a buffer to parse and leave it to the caller
      to determine how to allocate and populate the buffer.
      
      We use the _f naming convention for these new APIs even though they are
      perfectly useable after relocation and the environment being ready.
      
      We also now warn if the non-f APIs are called before the environment is
      ready to allow users to address the issues.
      
      Finally, we convert the 8xxx DDR code to utilize the new APIs to
      hopefully address the issue once and for all.  We have the 8xxx DDR code
      create a buffer on the stack and populate it via getenv_f().
      Signed-off-by: default avatarKumar Gala <galak@kernel.crashing.org>
      Acked-by: default avatarWolfgang Denk <wd@denx.de>
      dd50af25
  3. 16 Jul, 2009 1 commit
    • Anton Vorontsov's avatar
      Add simple hwconfig infrastructure · 93f9dcf9
      Anton Vorontsov authored
      This patch implements simple hwconfig infrastructure: an
      interface for software knobs to control a hardware.
      
      This is very simple implementation, i.e. it is implemented
      via `hwconfig' environment variable. Later we could write
      some "hwconfig <enable|disable|list>" commands, ncurses
      interface for Award BIOS-like interface, and frame-buffer
      interface for AMI GUI[1] BIOS-like interface with mouse
      support[2].
      
      Current implementation details/limitations:
      
      1. Doesn't support options dependencies and mutual exclusion.
         We can implement this by integrating apt-get[3] into the
         u-boot. But I didn't bother yet.
      
      2. Since we don't implement hwconfig command, i.e. we're working
         with the environement directly, there is no way to tell that
         toggling a particular option will need a reboot to take
         an effect. So, for now it's advised to always reboot the
         target after modifying hwconfig variable.
      
      3. We support hwconfig options with arguments. For example,
      
         set hwconfig dr_usb:mode=peripheral,phy_type=ulpi
      
         That means:
         - dr_usb - enable Dual-Role USB controller;
         - dr_usb:mode=peripheral - USB in Function mode;
         - dr_usb:phy_type=ulpi - USB should work with ULPI PHYs;
      
      The purpose of this simple implementation is to define some
      internal API and then we can continue improving user experience
      by adding more mature interface, like hwconfig command with
      bells and whistles. Or not adding, if we feel that current
      interface fits its needs.
      
      [1] http://en.wikipedia.org/wiki/American_Megatrends
      [2] Regarding ncurses and GUI with mouse support -- I'm just
          kidding.
      [3] The comment regarding apt-get is also a joke, meaning that
          dependency tracking could be non-trivial. For example, for
          enabling HW feature X we may need to disable Y, and turn Z
          into reduced mode (like RMII-only interface for ethernet,
          no MII).
      
          It's quite trivial to implement simple cases though.
      Signed-off-by: default avatarAnton Vorontsov <avorontsov@ru.mvista.com>
      Acked-by: default avatarKim Phillips <kim.phillips@freescale.com>
      93f9dcf9