[PATCH v1] imx: spl: fix imx8m secure boot

[Heiko Schocher]

inspired from NXP code:
719d665a87c6: ("MLK-20467 imx8m: Fix issue for booting signed image through uuu")

fix loading FIT buffer address to fix position
CONFIG_SYS_TEXT_BASE - CONFIG_FIT_EXTERNAL_OFFSET

and fix secure boot on imx8m based boards. Problem was
that FIT header and so IVT header too, was loaded to
memallocated address. So the ivt header address coded
in IVT itself does not fit with the real position.

Signed-off-by: Heiko Schocher <hs at denx.de>


---
replaces Series:
https://lists.denx.de/pipermail/u-boot/2021-August/457308.html

@Tim: could you please test this version on your hardware?

azure build:
https://dev.azure.com/hs0298/hs/_build/results?buildId=71&view=results
(fetch error for rockchip, but this should be no problem for this
 patch. How do I restart one specific job on azure?)

Works on sdcard and QSPI NOR boot on phycore-imx8mp board.

 arch/arm/mach-imx/spl.c | 11 +++++++++++
 common/spl/spl_fit.c    |  7 ++++++-
 2 files changed, 17 insertions(+), 1 deletion(-)

diff --git a/arch/arm/mach-imx/spl.c b/arch/arm/mach-imx/spl.c
index 36033d611c..6991d88dbf 100644
--- a/arch/arm/mach-imx/spl.c
+++ b/arch/arm/mach-imx/spl.c
@@ -334,6 +334,17 @@ void board_spl_fit_post_load(const void *fit)
 }
 #endif
 
+#if defined(CONFIG_FIT_EXTERNAL_OFFSET)
+void *board_spl_fit_buffer_addr(ulong fit_size, int bl_len)
+{
+	/*
+	 * use fix position
+	 * TEXT_BASE - FIT_EXTERNAL_OFFSET
+	 */
+	return  (void *)((CONFIG_SYS_TEXT_BASE - CONFIG_FIT_EXTERNAL_OFFSET));
+}
+#endif
+
 #endif
 
 #if defined(CONFIG_MX6) && defined(CONFIG_SPL_OS_BOOT)
diff --git a/common/spl/spl_fit.c b/common/spl/spl_fit.c
index f41abca0cc..a4337d3c88 100644
--- a/common/spl/spl_fit.c
+++ b/common/spl/spl_fit.c
@@ -538,6 +538,11 @@ static void *spl_get_fit_load_buffer(size_t size)
 	return buf;
 }
 
+__weak void *board_spl_fit_buffer_addr(ulong fit_size, int sectors, int bl_len)
+{
+	return spl_get_fit_load_buffer(sectors * bl_len);
+}
+
 /*
  * Weak default function to allow customizing SPL fit loading for load-only
  * use cases by allowing to skip the parsing/processing of the FIT contents
@@ -631,7 +636,7 @@ static int spl_simple_fit_read(struct spl_fit_info *ctx,
 	 * For FIT with external data, data is not loaded in this step.
 	 */
 	sectors = get_aligned_image_size(info, size, 0);
-	buf = spl_get_fit_load_buffer(sectors * info->bl_len);
+	buf = board_spl_fit_buffer_addr(size, sectors, info->bl_len);
 
 	count = info->read(info, sector, sectors, buf);
 	ctx->fit = buf;
-- 
2.31.1