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| author | Stephen Warren <swarren@nvidia.com> | 2012-10-02 09:26:51 (GMT) |
|---|---|---|
| committer | Tom Warren <twarren@nvidia.com> | 2012-10-29 16:07:04 (GMT) |
| commit | 938176a48274361c0b86b237ff6c0953a08233b3 (patch) | |
| tree | d4ca2096ed256ae53ff2bca555d6c6400863031b | |
| parent | 7f1b767aea949d954e75fa635968a9d315d2e7ff (diff) | |
| download | u-boot-938176a48274361c0b86b237ff6c0953a08233b3.tar.xz | |
ARM: tegra: use standard variables to define load addresses
Currently, Tegra's default environment uses non-standard variables to define
where boot scripts should load the kernel, FDT, and initrd. This change both
changes the variable names to match those described in U-Boot's README, and
shuffles their values around a little so that the values make a little more
sense; see comments in the patch for rationale behind the values chosen.
Note that this patch does remove the old non-standard variable "fdt_load" from
the default environment, so this patch requires people to change their boot
scripts.
Signed-off-by: Stephen Warren <swarren@nvidia.com>
Acked-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Tom Warren <twarren@nvidia.com>
| -rw-r--r-- | include/configs/tegra-common-post.h | 31 |
1 files changed, 28 insertions, 3 deletions
diff --git a/include/configs/tegra-common-post.h b/include/configs/tegra-common-post.h index 5d1d3dd..6835155 100644 --- a/include/configs/tegra-common-post.h +++ b/include/configs/tegra-common-post.h @@ -95,8 +95,6 @@ #endif #define BOOTCMDS_COMMON \ - "scriptaddr=0x400000\0" \ - \ "rootpart=1\0" \ \ "script_boot=" \ @@ -140,9 +138,36 @@ #endif +/* + * Memory layout for where various images get loaded by boot scripts: + * + * scriptaddr can be pretty much anywhere that doesn't conflict with something + * else. Put it above BOOTMAPSZ to eliminate conflicts. + * + * kernel_addr_r must be within the first 128M of RAM in order for the + * kernel's CONFIG_AUTO_ZRELADDR option to work. Since the kernel will + * decompress itself to 0x8000 after the start of RAM, kernel_addr_r + * should not overlap that area, or the kernel will have to copy itself + * somewhere else before decompression. Similarly, the address of any other + * data passed to the kernel shouldn't overlap the start of RAM. Pushing + * this up to 16M allows for a sizable kernel to be decompressed below the + * compressed load address. + * + * fdt_addr_r simply shouldn't overlap anything else. Choosing 32M allows for + * the compressed kernel to be up to 16M too. + * + * ramdisk_addr_r simply shouldn't overlap anything else. Choosing 33M allows + * for the FDT/DTB to be up to 1M, which is hopefully plenty. + */ +#define MEM_LAYOUT_ENV_SETTINGS \ + "scriptaddr=0x10000000\0" \ + "kernel_addr_r=0x01000000\0" \ + "fdt_addr_r=0x02000000\0" \ + "ramdisk_addr_r=0x02100000\0" \ + #define CONFIG_EXTRA_ENV_SETTINGS \ TEGRA_DEVICE_SETTINGS \ - "fdt_load=0x01000000\0" \ + MEM_LAYOUT_ENV_SETTINGS \ BOOTCMDS_COMMON /* overrides for SPL build here */ |