arm: highbank: Limit FDT and initrd load addresses

So far on Highbank/Midway machines U-Boot only ever uses 512MB of DRAM,
even though the machines have typically 4GB and 8GB, respectively.
That means that so far we didn't need an extra limit for placing the DTB
and initrd, as the 512MB are lower than the kernel's limit ("lowmem",
typically 768MB).

With U-Boot now needing to learn about the actual memory size (to
correctly populate the EFI memory map), it might relocate fdt and initrd
to the end of DRAM, which is out of reach of the kernel.

So add limiting values to the fdt_high and initrd_high environment
variables, to prevent U-Boot from using too high addresses.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Reviewed-by: Tom Rini <trini@konsulko.com>

diff --git a/include/configs/highbank.h b/include/configs/highbank.h
index bdbaa475d204d0acbdf05d68593fc40afa8b6435..5e3cc3a1db61b82d87527328f6be26c70d59b29c 100644 (file)
--- a/include/configs/highbank.h
+++ b/include/configs/highbank.h
@@ -57,4 +57,8 @@
 #define CONFIG_SYS_INIT_SP_ADDR                0x01000000
 #define CONFIG_SKIP_LOWLEVEL_INIT
 
+#define CONFIG_EXTRA_ENV_SETTINGS                              \
+       "fdt_high=0x20000000\0"                                 \
+       "initrd_high=0x20000000\0"
+
 #endif