spl: allow a separate TEXT_BASE, LDSCRIPT and MAX_SIZE for TPL

For the bringup of the RK3368, we need to support TPL and SPL running
from different addresses... which requires both stages to use a
distinct TEXT_BASE.

This commit adds support for having a separate LDSCRIPT for TPL (which
is expected to make use of the TPL_MAX_SIZE define) and for having a
the option of defining TPL_TEXT_BASE and having the TPL stage linked
against this address.

Note that the handling of the TEXT_BASE is designed to not interfere
with the previous assumption that SPL_TEXT_BASE should be used for TPL
as well, unless TPL_TEXT_BASE is defined.  For this reason, the test
in Makefile.spl uses the following (seemingly redundant checks):
 1. looks for $(SPL_TPL_)TEXT_BASE
 2. looks for SPL_TEXT_BASE (even when building in TPL)

Signed-off-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

scripts/Makefile.spl

@@ -103,9 +103,9 @@ u-boot-spl-platdata := $(obj)/dts/dt-platdata.o
 endif
 
 # Linker Script
-ifdef CONFIG_SPL_LDSCRIPT
+ifdef CONFIG_$(SPL_TPL_)LDSCRIPT
 # need to strip off double quotes
-LDSCRIPT := $(addprefix $(srctree)/,$(CONFIG_SPL_LDSCRIPT:"%"=%))
+LDSCRIPT := $(addprefix $(srctree)/,$(CONFIG_$(SPL_TPL_)LDSCRIPT:"%"=%))
 endif
 
 ifeq ($(wildcard $(LDSCRIPT)),)
@@ -293,9 +293,15 @@ LDFLAGS_$(SPL_BIN) += -T u-boot-spl.lds $(LDFLAGS_FINAL)
 # Avoid 'Not enough room for program headers' error on binutils 2.28 onwards.
 LDFLAGS_$(SPL_BIN) += $(call ld-option, --no-dynamic-linker)
 
+# First try the best-match (i.e. SPL_TEXT_BASE for SPL, TPL_TEXT_BASE for TPL)
+ifneq ($(CONFIG_$(SPL_TPL_)TEXT_BASE),)
+LDFLAGS_$(SPL_BIN) += -Ttext $(CONFIG_$(SPL_TPL_)TEXT_BASE)
+else
+# And then fall back to just testing for SPL_TEXT_BASE, even if in TPL mode
 ifneq ($(CONFIG_SPL_TEXT_BASE),)
 LDFLAGS_$(SPL_BIN) += -Ttext $(CONFIG_SPL_TEXT_BASE)
 endif
+endif
 
 MKIMAGEFLAGS_$(SPL_BIN).sfp = -T socfpgaimage
 $(obj)/$(SPL_BIN).sfp: $(obj)/$(SPL_BIN).bin FORCE

scripts/config_whitelist.txt

@@ -4910,8 +4910,11 @@ CONFIG_TI_KSNAV
 CONFIG_TI_SPI_MMAP
 CONFIG_TMU_TIMER
 CONFIG_TPL_DRIVERS_MISC_SUPPORT
+CONFIG_TPL_LDSCRIPT
+CONFIG_TPL_MAX_SIZE
 CONFIG_TPL_PAD_TO
 CONFIG_TPL_STACK
+CONFIG_TPL_TEXT_BASE
 CONFIG_TPM_TIS_BASE_ADDRESS
 CONFIG_TPS6586X_POWER
 CONFIG_TQM834X