Merge remote-tracking branch 'u-boot-imx/master'

[pandora-u-boot.git] / doc / README.SPL

diff --git a/doc/README.SPL b/doc/README.SPL
index f01a8bd..e4a5ac3 100644 (file)
--- a/doc/README.SPL
+++ b/doc/README.SPL
@@ -42,8 +42,8 @@ The building of SPL images can be with:
 
 #define CONFIG_SPL
 
-Because SPL images normally have a different text base, one have to be
-configured by defining CONFIG_SPL_TEXT_BASE. The linker script have to be
+Because SPL images normally have a different text base, one has to be
+configured by defining CONFIG_SPL_TEXT_BASE. The linker script has to be
 defined with CONFIG_SPL_LDSCRIPT.
 
 To support generic U-Boot libraries and drivers in the SPL binary one can
@@ -66,3 +66,15 @@ CONFIG_SPL_DMA_SUPPORT (drivers/dma/libdma.o)
 CONFIG_SPL_POST_MEM_SUPPORT (post/drivers/memory.o)
 CONFIG_SPL_NAND_LOAD (drivers/mtd/nand/nand_spl_load.o)
 CONFIG_SPL_SPI_LOAD (drivers/mtd/spi/spi_spl_load.o)
+
+
+Normally CPU is assumed to be the same between the SPL and normal
+u-boot build.  However it is possible to specify a different CPU for
+the SPL build for cases where the SPL is expected to run on a
+different CPU model from the main u-boot.  This is done by specifying
+an SPL CPU in boards.cfg as follows:
+
+       normal_cpu:spl_cpu
+
+This this case CPU will be set to "normal_cpu" during the main u-boot
+build and "spl_cpu" during the SPL build.