target/linux/ar71xx/patches-4.14/702-MIPS-ath79-fixup-routerboot-board-parameter.patch

   1 From: Gabor Juhos <juhosg@freemail.hu>
   2 Date: Sat, 2 Dec 2017 19:15:29 +0100
   3 Subject: [PATCH] MIPS: ath79: fix board detection with newer RouterBOOT versions
   4
   5 Recent RouterBOOT version (at least version 3.41 on RB911G-5HPacD)
   6 use "Board=" kernel parameter instead of "board=" to pass the board
   7 name to the kernel. Due to this change the board detection code is
   8 not working on the devices shipped with the new RouterBOOT version.
   9 Because the kernel is unable to identify these boards they become
  10 unusable despite that they are supported by the current code.
  11
  12 Update the prom_init code to convert the 'Board' kernel parameter to
  13 'board'. After this change, the board detection works also with the
  14 new RouterBOOT versions.
  15
  16 Signed-off-by: Gabor Juhos <juhosg@freemail.hu>
  17 ---
  18 --- a/arch/mips/ath79/prom.c
  19 +++ b/arch/mips/ath79/prom.c
  20 @@ -104,6 +104,7 @@ static int __init ath79_prom_init_myload
  21  void __init prom_init(void)
  22  {
  23         const char *env;
  24 +       char *c;
  25
  26         if (ath79_prom_init_myloader())
  27                 return;
  28 @@ -137,6 +138,15 @@ void __init prom_init(void)
  29         }
  30  #endif
  31
  32 +       /*
  33 +        * RouterBOOT uses "Board" kernel parameter instead of "board" since
  34 +        * version 3.41 (or so). Replace the first character of the parameter
  35 +        * to keep board detection working.
  36 +        */
  37 +       c = strstr(arcs_cmdline, "Board=");
  38 +       if (c)
  39 +               c[0] = 'b';
  40 +
  41         if (strstr(arcs_cmdline, "board=750Gr3") ||
  42             strstr(arcs_cmdline, "board=750i") ||
  43             strstr(arcs_cmdline, "board=750-hb") ||