target/linux/etrax-2.6/patches/cris/016-auto-detect-ram.patch

   1 diff -urN linux-2.6.19.2//arch/cris/arch-v10/boot/compressed/hw_settings.S /tmp/linux-2.6.19.2/arch/cris/arch-v10/boot/compressed/hw_settings.S
   2 --- linux-2.6.19.2//arch/cris/arch-v10/boot/compressed/hw_settings.S    2007-06-01 00:37:57.000000000 +0200
   3 +++ /tmp/linux-2.6.19.2/arch/cris/arch-v10/boot/compressed/hw_settings.S        2007-06-01 00:34:55.000000000 +0200
   4 @@ -62,3 +62,5 @@
   5         .dword 0 ; No more register values
   6         .ascii "ACME_PART_MAGIC" ; Magic number
   7         .dword 0xdeadc0de
   8 +       .ascii "ACME_RAM_MAGIC" ; Magic number
   9 +       .dword 0x2000000
  10 diff -urN linux-2.6.19.2//arch/cris/arch-v10/boot/compressed/hw_settings_416.S /tmp/linux-2.6.19.2/arch/cris/arch-v10/boot/compressed/hw_settings_416.S
  11 --- linux-2.6.19.2//arch/cris/arch-v10/boot/compressed/hw_settings_416.S        2007-06-01 00:37:57.000000000 +0200
  12 +++ /tmp/linux-2.6.19.2/arch/cris/arch-v10/boot/compressed/hw_settings_416.S    2007-06-01 00:34:55.000000000 +0200
  13 @@ -62,3 +62,5 @@
  14         .dword 0 ; No more register values
  15         .ascii "ACME_PART_MAGIC" ; Magic number
  16         .dword 0xdeadc0de
  17 +       .ascii "ACME_RAM_MAGIC" ; Magic number
  18 +       .dword 0x1000000
  19 diff -urN linux-2.6.19.2//arch/cris/arch-v10/boot/compressed/hw_settings_816.S /tmp/linux-2.6.19.2/arch/cris/arch-v10/boot/compressed/hw_settings_816.S
  20 --- linux-2.6.19.2//arch/cris/arch-v10/boot/compressed/hw_settings_816.S        2007-06-01 00:37:57.000000000 +0200
  21 +++ /tmp/linux-2.6.19.2/arch/cris/arch-v10/boot/compressed/hw_settings_816.S    2007-06-01 00:34:55.000000000 +0200
  22 @@ -62,3 +62,5 @@
  23         .dword 0 ; No more register values
  24         .ascii "ACME_PART_MAGIC" ; Magic number
  25         .dword 0xdeadc0de
  26 +       .ascii "ACME_RAM_MAGIC" ; Magic number
  27 +       .dword 0x1000000
  28 diff -urN linux-2.6.19.2//arch/cris/arch-v10/boot/compressed/hw_settings_832.S /tmp/linux-2.6.19.2/arch/cris/arch-v10/boot/compressed/hw_settings_832.S
  29 --- linux-2.6.19.2//arch/cris/arch-v10/boot/compressed/hw_settings_832.S        2007-06-01 00:37:57.000000000 +0200
  30 +++ /tmp/linux-2.6.19.2/arch/cris/arch-v10/boot/compressed/hw_settings_832.S    2007-06-01 00:34:55.000000000 +0200
  31 @@ -62,3 +62,5 @@
  32         .dword 0 ; No more register values
  33         .ascii "ACME_PART_MAGIC" ; Magic number
  34         .dword 0xdeadc0de
  35 +       .ascii "ACME_RAM_MAGIC" ; Magic number
  36 +       .dword 0x2000000
  37 diff -urN linux-2.6.19.2//arch/cris/arch-v10/boot/compressed/hw_settings_MCM.S /tmp/linux-2.6.19.2/arch/cris/arch-v10/boot/compressed/hw_settings_MCM.S
  38 --- linux-2.6.19.2//arch/cris/arch-v10/boot/compressed/hw_settings_MCM.S        2007-06-01 00:37:57.000000000 +0200
  39 +++ /tmp/linux-2.6.19.2/arch/cris/arch-v10/boot/compressed/hw_settings_MCM.S    2007-06-01 00:34:55.000000000 +0200
  40 @@ -62,3 +62,5 @@
  41         .dword 0 ; No more register values
  42         .ascii "ACME_PART_MAGIC" ; Magic number
  43         .dword 0xdeadc0de
  44 +       .ascii "ACME_RAM_MAGIC" ; Magic number
  45 +       .dword 0x1000000
  46 --- linux-2.6.19.2//arch/cris/kernel/setup.c    2007-06-01 00:37:55.000000000 +0200
  47 +++ /tmp/linux-2.6.19.2/arch/cris/kernel/setup.c        2007-06-01 00:34:55.000000000 +0200
  48 @@ -55,6 +55,13 @@
  49   * boot code and the system.
  50   *
  51   */
  52 +#ifdef CONFIG_CRIS_LOW_MAP
  53 +#define FLASH_UNCACHED_ADDR  KSEG_8
  54 +#define FLASH_CACHED_ADDR    KSEG_5
  55 +#else
  56 +#define FLASH_UNCACHED_ADDR  KSEG_E
  57 +#define FLASH_CACHED_ADDR    KSEG_F
  58 +#endif
  59
  60  void __init
  61  setup_arch(char **cmdline_p)
  62 @@ -63,15 +70,37 @@
  63         unsigned long bootmap_size;
  64         unsigned long start_pfn, max_pfn;
  65         unsigned long memory_start;
  66 -
  67 +       unsigned int ram_size = 0;
  68 +       unsigned char *flash_mem = (unsigned char*)(FLASH_CACHED_ADDR);
  69 +       unsigned int ram_scan_count = 0;
  70 +       const char *ram_magic = "ACME_RAM_MAGIC";
  71 +       unsigned int magic_len = strlen(ram_magic);
  72 +       unsigned long dend;
  73         /* register an initial console printing routine for printk's */
  74
  75         init_etrax_debug();
  76
  77         /* we should really poll for DRAM size! */
  78 +       printk(KERN_INFO "Determinig RAM size\n");
  79 +       for(ram_scan_count = 0; ram_scan_count < 100000; ram_scan_count++){
  80 +               if(strncmp(&flash_mem[ram_scan_count], ram_magic, magic_len - 1) == 0){
  81 +                       ram_size = flash_mem[ram_scan_count + magic_len ];
  82 +                       ram_size <<= 8;
  83 +                       ram_size += flash_mem[ram_scan_count + magic_len + 2];
  84 +                       ram_size <<= 8;
  85 +                       ram_size += flash_mem[ram_scan_count + magic_len + 1];
  86 +                       ram_size <<= 8;
  87 +                       ram_size += flash_mem[ram_scan_count + magic_len + 3];
  88 +                       printk(KERN_INFO "RAM size is %uMB\n", 16 * ram_size);
  89 +                       ram_scan_count = 1100000;
  90 +               }
  91 +       }
  92
  93         high_memory = &dram_end;
  94 -
  95 +       dend = dram_start + 16 * 1024 * 1024 * ram_size;
  96 +       if(ram_size == 1){
  97 +               high_memory = 0xc1000000;
  98 +       }
  99         if(romfs_in_flash || !romfs_length) {
 100                 /* if we have the romfs in flash, or if there is no rom filesystem,
 101                  * our free area starts directly after the BSS