bsp: tegra: systemd-boot: double dtb buffer size

This is probably due to fact systemd-boot does not allocate any extra space for the device tree.
Without the modification, because there is not any extra space, the UEFI will fail applying the
overlay changes from its .dtbo files

Fixes:
| EFI stub: ERROR: Invalid header detected on UEFI supplied FDT, ignoring ...
| EFI stub: Generating empty DTB

References:
anduril/jetpack-nixos#111

Signed-off-by: Jose Quaresma <[email protected]>

meta-lmp-bsp/dynamic-layers/tegra/recipes-core/systemd/systemd-boot/0001-Increase-the-dtb-size.patch

@@ -0,0 +1,60 @@
+From 919601f2598eb3dd17fe88d26cafed88420daad2 Mon Sep 17 00:00:00 2001
+From: Brian McGillion <[email protected]>
+Date: Thu, 23 Jan 2025 13:08:15 +0400
+Subject: [PATCH] Increase the dtb size
+
+This is probably due to fact systemd-boot does not allocate any extra space for the device tree.
+Without the modification, because there is not any extra space, the UEFI will fail applying the
+overlay changes from its .dtbo files
+
+Fixes:
+| EFI stub: ERROR: Invalid header detected on UEFI supplied FDT, ignoring ...
+| EFI stub: Generating empty DTB
+
+References:
+https://github.com/anduril/jetpack-nixos/issues/111
+
+Upstream-Status: Pending [https://github.com/tiiuae/ghaf/blob/main/modules/common/systemd/systemd-boot-double-dtb-buffer-size.patch]
+
+Signed-off-by: Brian McGillion <[email protected]>
+Signed-off-by: Jose Quaresma <[email protected]>
+---
+ src/boot/efi/devicetree.c | 8 +++++++-
+ 1 file changed, 7 insertions(+), 1 deletion(-)
+
+diff --git a/src/boot/efi/devicetree.c b/src/boot/efi/devicetree.c
+index 61a43cd77d..f939a79963 100644
+--- a/src/boot/efi/devicetree.c
++++ b/src/boot/efi/devicetree.c
+@@ -3,6 +3,7 @@
+ #include "devicetree.h"
+ #include "proto/dt-fixup.h"
+ #include "util.h"
++#include <endian.h>
+
+ #define FDT_V1_SIZE (7*4)
+
+@@ -88,7 +89,8 @@ EFI_STATUS devicetree_install(struct devicetree_state *state, EFI_FILE *root_dir
+                 /* 32MB device tree blob doesn't seem right */
+                 return EFI_INVALID_PARAMETER;
+
+-        len = info->FileSize;
++        /* Double the length to be allocated so there's space for modifications */
++        len = info->FileSize * 4;
+
+         err = devicetree_allocate(state, len);
+         if (err != EFI_SUCCESS)
+@@ -102,6 +104,10 @@ EFI_STATUS devicetree_install(struct devicetree_state *state, EFI_FILE *root_dir
+         if (err != EFI_SUCCESS)
+                 return err;
+
++        /* Double the size inside the device tree structure */
++        uint32_t *totalsize = (uint32_t *)(((char *)PHYSICAL_ADDRESS_TO_POINTER(state->addr) + 4));
++        (*totalsize) = htobe32(be32toh(*totalsize) * 4);
++
+         return BS->InstallConfigurationTable(
+                         MAKE_GUID_PTR(EFI_DTB_TABLE), PHYSICAL_ADDRESS_TO_POINTER(state->addr));
+ }
+-- 
+2.48.1
+

meta-lmp-bsp/dynamic-layers/tegra/recipes-core/systemd/systemd-boot_%.bbappend

@@ -0,0 +1,3 @@
+FILESEXTRAPATHS:prepend := "${THISDIR}/${PN}:"
+
+SRC_URI:append:orin-nano = " file://0001-Increase-the-dtb-size.patch"