ARM: tegra: CONFIG_{SYS_, }LOAD{_, }ADDR rationalization

As best I can tell, CONFIG_SYS_LOAD_ADDR and CONFIG_LOADADDR/$loadaddr
serve essentially the same purpose. Roughly, if a command takes a load
address, then CONFIG_SYS_LOAD_ADDR or $loadaddr (or both) are the default
if the command-line does not specify the address. Different U-Boot
commands are inconsistent re: which of the two default values they use.
As such, set the two to the same value, and move the logic that does this
 into tegra-common-post.h so it's not duplicated. A number of other non-
Tegra boards do this too.

The values chosen for these macros are no longer consistent with anything
in MEM_LAYOUT_ENV_SETTINGS. Regain consistency by setting $kernel_addr_r
to CONFIG_LOADADDR. Older scripts tend to use $loadaddr for the default
kernel load address, whereas newer scripts and features tend to use
$kernel_addr_r, along with other variables for other purposes such as
DTBs and initrds. Hence, it's logical they should share the same value.

I had originally thought to make the $kernel_addr_r and CONFIG_LOADADDR
have different values. This would guarantee no interference if a script
used the two variables for different purposes. However, that scenario is
unlikely given the semantic meaning associated with the two variables.
The lowest available value is 0x90200000; see comments for
MEM_LAYOUT_ENV_SETTINGS in tegra30-common-post.h for details. However,
that value would be problematic for a script that loaded a raw zImage to
$loadaddr, since it's more than 128MB beyond the start of SDRAM, which
would interfere with the kernel's CONFIG_AUTO_ZRELADDR. So, let's not do
that.

The only potential fallout I could foresee from this patch is if someone
has a script that loads the kernel to $loadaddr, but some other file
(DTB, initrd) to a hard-coded address that the new value of $loadaddr
interferes with. This seems unlikely. A user should not do that; they
should either hard-code all load addresses, or use U-Boot-supplied
variables for all load addresses. Equally, any fallout due to this change
is trivial to fix; simply modify the load addresses in that script.

Cc: Paul Walmsley <pwalmsley@nvidia.com>
Signed-off-by: Stephen Warren <swarren@nvidia.com>
Reviewed-by: Paul Walmsley <pwalmsley@nvidia.com>
Reviewed-by: Simon Glass
Signed-off-by: Tom Warren <twarren@nvidia.com>

1 files changed, 2 insertions, 5 deletions

diff --git a/include/configs/tegra20-common.h b/include/configs/tegra20-common.h
index 6330281df7..0841f33bfc 100644
--- a/include/configs/tegra20-common.h
+++ b/include/configs/tegra20-common.h
@@ -24,13 +24,9 @@
  */
 #define V_NS16550_CLK		216000000	/* 216MHz (pllp_out0) */
 
-/* Environment information, boards can override if required */
-#define CONFIG_LOADADDR		0x00408000	/* def. location for kernel */
-
 /*
  * Miscellaneous configurable options
  */
-#define CONFIG_SYS_LOAD_ADDR	0x00A00800	/* default */
 #define CONFIG_STACKBASE	0x02800000	/* 40MB */
 
 /*-----------------------------------------------------------------------
@@ -62,10 +58,11 @@
  * 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 CONFIG_LOADADDR 0x01000000
 #define MEM_LAYOUT_ENV_SETTINGS \
 	"scriptaddr=0x10000000\0" \
 	"pxefile_addr_r=0x10100000\0" \
-	"kernel_addr_r=0x01000000\0" \
+	"kernel_addr_r=" __stringify(CONFIG_LOADADDR) "\0" \
 	"fdt_addr_r=0x02000000\0" \
 	"ramdisk_addr_r=0x02100000\0"