configs/hifive_unleashed: bump Linux to 6.12.20 and U-Boot to 2025.01

This commit bumps Linux to 6.12.20 and U-Boot to 2025.01, to
align versions to those used in the Hifive Unmatched defconfig
to make maintenance easier. The new U-Boot version needs gnutls.

This commit also enabled BR2_DOWNLOAD_FORCE_CHECK_HASHES in
defconfigs. The .checkpackageignore is updated to reflect that change.

Signed-off-by: Francois Dugast <francois.dugast.foss@gmail.com>
[Julien:
 - reword commit log
 - add missing BR2_TARGET_UBOOT_NEEDS_GNUTLS=y
 - change linux.hash comment to take hash from upstream
 - change linux-headers.hash file to a symlink
]
Signed-off-by: Julien Olivain <ju.o@free.fr>

.checkpackageignore

@@ -146,7 +146,6 @@ configs/freescale_t2080_qds_rdb_defconfig lib_defconfig.ForceCheckHash
 configs/friendlyarm_nanopi_r2s_defconfig lib_defconfig.ForceCheckHash
 configs/galileo_defconfig lib_defconfig.ForceCheckHash
 configs/globalscale_espressobin_defconfig lib_defconfig.ForceCheckHash
-configs/hifive_unleashed_defconfig lib_defconfig.ForceCheckHash
 configs/imx23evk_defconfig lib_defconfig.ForceCheckHash
 configs/imx6-sabreauto_defconfig lib_defconfig.ForceCheckHash
 configs/imx6-sabresd_defconfig lib_defconfig.ForceCheckHash

board/sifive/hifive-unleashed/patches/linux-headers/linux-headers.hash

@@ -0,0 +1 @@
+../linux/linux.hash

board/sifive/hifive-unleashed/patches/linux/linux.hash

@@ -0,0 +1,2 @@
+# From https://www.kernel.org/pub/linux/kernel/v6.x/sha256sums.asc
+sha256  230e89b07b0ab82e74f07ecc1bee3105dca81d0ef4a97f900929c407249b6ac7  linux-6.12.20.tar.xz

board/sifive/hifive-unleashed/patches/opensbi/opensbi.hash

@@ -0,0 +1,2 @@
+# Locally calculated
+sha256  8fcbce598a73acc2c7f7d5607d46b9d5107d3ecbede8f68f42631dcfc25ef2b2  opensbi-1.2.tar.gz

configs/hifive_unleashed_defconfig

@@ -5,7 +5,9 @@ BR2_RISCV_ISA_RVA=y
 BR2_RISCV_ISA_RVF=y
 BR2_RISCV_ISA_RVD=y
 BR2_RISCV_ISA_RVC=y
-BR2_PACKAGE_HOST_LINUX_HEADERS_CUSTOM_5_10=y
+BR2_PACKAGE_HOST_LINUX_HEADERS_CUSTOM_6_12=y
+BR2_GLOBAL_PATCH_DIR="board/sifive/hifive-unleashed/patches"
+BR2_DOWNLOAD_FORCE_CHECK_HASHES=y
 BR2_TARGET_GENERIC_GETTY_PORT="ttySIF0"
 BR2_SYSTEM_DHCP="eth0"
 BR2_ROOTFS_POST_BUILD_SCRIPT="board/sifive/common/post-build.sh"
@@ -13,7 +15,7 @@ BR2_ROOTFS_POST_IMAGE_SCRIPT="support/scripts/genimage.sh"
 BR2_ROOTFS_POST_SCRIPT_ARGS="-c board/sifive/common/genimage_sdcard.cfg"
 BR2_LINUX_KERNEL=y
 BR2_LINUX_KERNEL_CUSTOM_VERSION=y
-BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="5.10.190"
+BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="6.12.20"
 BR2_LINUX_KERNEL_USE_ARCH_DEFAULT_CONFIG=y
 BR2_LINUX_KERNEL_CONFIG_FRAGMENT_FILES="board/sifive/common/linux.config.fragment"
 BR2_LINUX_KERNEL_DTS_SUPPORT=y
@@ -29,11 +31,12 @@ BR2_TARGET_OPENSBI_PLAT="generic"
 BR2_TARGET_UBOOT=y
 BR2_TARGET_UBOOT_BUILD_SYSTEM_KCONFIG=y
 BR2_TARGET_UBOOT_CUSTOM_VERSION=y
-BR2_TARGET_UBOOT_CUSTOM_VERSION_VALUE="2023.04"
+BR2_TARGET_UBOOT_CUSTOM_VERSION_VALUE="2025.01"
 BR2_TARGET_UBOOT_BOARD_DEFCONFIG="sifive_unleashed"
 BR2_TARGET_UBOOT_NEEDS_DTC=y
 BR2_TARGET_UBOOT_NEEDS_PYLIBFDT=y
 BR2_TARGET_UBOOT_NEEDS_OPENSSL=y
+BR2_TARGET_UBOOT_NEEDS_GNUTLS=y
 BR2_TARGET_UBOOT_NEEDS_OPENSBI=y
 BR2_TARGET_UBOOT_FORMAT_CUSTOM=y
 BR2_TARGET_UBOOT_FORMAT_CUSTOM_NAME="u-boot.itb"