packages/linux/linux-2.6.25/cm-x270/0002-ramdisk_load.patch

   1 From 66975ae3184aabc3080e23bf7f0195ed5862cb13 Mon Sep 17 00:00:00 2001
   2 From: Cliff Brake <cbrake@happy.dev.bec-systems.com>
   3 Date: Fri, 20 Jul 2007 19:01:50 -0400
   4 Subject: [PATCH] ramdisk_load
   5
   6 ---
   7  arch/arm/mach-pxa/cm-x270.c        |    6 ++++++
   8  include/asm-arm/arch-pxa/cm-x270.h |    4 ++++
   9  init/initramfs.c                   |   16 ++++++++++++++++
  10  3 files changed, 26 insertions(+), 0 deletions(-)
  11
  12 diff --git a/arch/arm/mach-pxa/cm-x270.c b/arch/arm/mach-pxa/cm-x270.c
  13 index ecdbc96..0487aee 100644
  14 --- a/arch/arm/mach-pxa/cm-x270.c
  15 +++ b/arch/arm/mach-pxa/cm-x270.c
  16 @@ -240,6 +240,12 @@ static struct map_desc cmx270_io_desc[] __initdata = {
  17                 .length         = SZ_64M,
  18                 .type           = MT_DEVICE
  19         },
  20 +       [2] = { /* NOR flash */
  21 +               .virtual        = CMX270_FLASH_VIRT,
  22 +               .pfn            = __phys_to_pfn(PXA_CS0_PHYS),
  23 +               .length         = (8<<20), /* up to 8 MByte flash */
  24 +               .type           = MT_DEVICE
  25 +       },
  26  };
  27
  28  /*
  29 diff --git a/include/asm-arm/arch-pxa/cm-x270.h b/include/asm-arm/arch-pxa/cm-x270.h
  30 index f8fac9e..70e0dce 100644
  31 --- a/include/asm-arm/arch-pxa/cm-x270.h
  32 +++ b/include/asm-arm/arch-pxa/cm-x270.h
  33 @@ -20,6 +20,10 @@
  34  #define CMX270_VIRT_BASE               (0xe8000000)
  35  #define CMX270_IT8152_VIRT             (CMX270_VIRT_BASE)
  36  #define CMX270_IDE104_VIRT             (CMX270_IT8152_VIRT + SZ_64M)
  37 +#define CMX270_FLASH_VIRT              (CMX270_IDE104_VIRT + SZ_64M)
  38 +
  39 +#define CMX270_FLASH_RAMDISK_VIRT      (CMX270_FLASH_VIRT + 0x1c0000)
  40 +
  41
  42  /* GPIO related definitions */
  43  #define GPIO_IT8152_IRQ                        (22)
  44 diff --git a/init/initramfs.c b/init/initramfs.c
  45 index d53fee8..bfcf0ea 100644
  46 --- a/init/initramfs.c
  47 +++ b/init/initramfs.c
  48 @@ -7,6 +7,9 @@
  49  #include <linux/string.h>
  50  #include <linux/syscalls.h>
  51
  52 +// HACK for compulab cm-x270
  53 +#include <asm/arch/cm-x270.h>
  54 +
  55  static __initdata char *message;
  56  static void __init error(char *x)
  57  {
  58 @@ -546,7 +549,20 @@ static int __init populate_rootfs(void)
  59                 panic(err);
  60         if (initrd_start) {
  61  #ifdef CONFIG_BLK_DEV_RAM
  62 +
  63 +               /* hack to make initramfs work because the
  64 +                * compulab BL does not zero out the
  65 +                * initrd memory.  This only seems to affect loading
  66 +                * initramfs (cpio.gz) archives.  Does not seem to
  67 +                * affect ramdisks.
  68 +                */
  69 +               int initrd_size = *(int *)(CMX270_FLASH_RAMDISK_VIRT);
  70                 int fd;
  71 +
  72 +               initrd_end = initrd_start + initrd_size;
  73 +               //printk("CLIFF: initrd_start = 0x%x\n", initrd_start);
  74 +               //printk("CLIFF: initrd_end = 0x%x\n", initrd_end);
  75 +
  76                 printk(KERN_INFO "checking if image is initramfs...");
  77                 err = unpack_to_rootfs((char *)initrd_start,
  78                         initrd_end - initrd_start, 1);
  79 --
  80 1.5.4.rc4
  81