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ARM: tegra: use standard variables to define load addresses

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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>
This commit is contained in:
Stephen Warren 2012-10-02 09:26:51 +00:00 committed by Tom Warren
parent 7f1b767aea
commit 938176a482
1 changed files with 28 additions and 3 deletions
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31
include/configs/tegra-common-post.h
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@ -95,8 +95,6 @@
#endif #endif
#define BOOTCMDS_COMMON \ #define BOOTCMDS_COMMON \
"scriptaddr=0x400000\0" \
\
"rootpart=1\0" \ "rootpart=1\0" \
\ \
"script_boot=" \ "script_boot=" \
@ -140,9 +138,36 @@
#endif #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 \ #define CONFIG_EXTRA_ENV_SETTINGS \
TEGRA_DEVICE_SETTINGS \ TEGRA_DEVICE_SETTINGS \
"fdt_load=0x01000000\0" \ MEM_LAYOUT_ENV_SETTINGS \
BOOTCMDS_COMMON BOOTCMDS_COMMON
/* overrides for SPL build here */ /* overrides for SPL build here */