diff --git a/target/linux/sifiveu/Makefile b/target/linux/sifiveu/Makefile
index 52989a9dae..3a003a35fc 100644
--- a/target/linux/sifiveu/Makefile
+++ b/target/linux/sifiveu/Makefile
@@ -12,6 +12,7 @@ KERNELNAME:=Image dtbs
 SUBTARGETS:=generic
 
 KERNEL_PATCHVER:=6.1
+KERNEL_TESTING_PATCHVER:=6.6
 
 include $(INCLUDE_DIR)/target.mk
 
diff --git a/target/linux/sifiveu/config-6.6 b/target/linux/sifiveu/config-6.6
index 98283f4e0d..9a8cf8e48c 100644
--- a/target/linux/sifiveu/config-6.6
+++ b/target/linux/sifiveu/config-6.6
@@ -1,4 +1,5 @@
 CONFIG_64BIT=y
+# CONFIG_ACPI is not set
 CONFIG_ARCH_CLOCKSOURCE_INIT=y
 CONFIG_ARCH_DMA_ADDR_T_64BIT=y
 CONFIG_ARCH_MMAP_RND_BITS=18
@@ -8,6 +9,7 @@ CONFIG_ARCH_MMAP_RND_COMPAT_BITS_MAX=17
 CONFIG_ARCH_OPTIONAL_KERNEL_RWX=y
 CONFIG_ARCH_OPTIONAL_KERNEL_RWX_DEFAULT=y
 CONFIG_ARCH_RV64I=y
+# CONFIG_ARCH_THEAD is not set
 CONFIG_ARCH_SELECT_MEMORY_MODEL=y
 CONFIG_ARCH_SPARSEMEM_ENABLE=y
 CONFIG_ARCH_STACKWALK=y
@@ -16,6 +18,7 @@ CONFIG_ASN1=y
 CONFIG_ASSOCIATIVE_ARRAY=y
 CONFIG_ATA=y
 CONFIG_ATA_VERBOSE_ERROR=y
+# CONFIG_AX45MP_L2_CACHE is not set
 CONFIG_BLK_DEV_SD=y
 CONFIG_BLK_MQ_PCI=y
 CONFIG_CAVIUM_PTP=y
@@ -93,6 +96,7 @@ CONFIG_EFI_STUB=y
 # CONFIG_EFI_TEST is not set
 # CONFIG_EFI_ZBOOT is not set
 CONFIG_ELF_CORE=y
+# CONFIG_ERRATA_ANDES is not set
 CONFIG_ERRATA_SIFIVE=y
 CONFIG_ERRATA_SIFIVE_CIP_1200=y
 CONFIG_ERRATA_SIFIVE_CIP_453=y
@@ -168,8 +172,10 @@ CONFIG_I2C_OCORES=y
 CONFIG_INITRAMFS_SOURCE=""
 CONFIG_INPUT=y
 # CONFIG_IOMMU_DEBUGFS is not set
+# CONFIG_IOMMUFD is not set
 CONFIG_IOMMU_SUPPORT=y
 CONFIG_IO_URING=y
+CONFIG_IRQ_STACKS=y
 CONFIG_IRQCHIP=y
 CONFIG_IRQ_DOMAIN=y
 CONFIG_IRQ_DOMAIN_HIERARCHY=y
@@ -304,7 +310,13 @@ CONFIG_RISCV_ALTERNATIVE=y
 CONFIG_RISCV_DMA_NONCOHERENT=y
 CONFIG_RISCV_INTC=y
 CONFIG_RISCV_ISA_C=y
+CONFIG_RISCV_ISA_FALLBACK=y
+CONFIG_RISCV_ISA_SVNAPOT=y
 CONFIG_RISCV_ISA_SVPBMT=y
+CONFIG_RISCV_ISA_V=y
+CONFIG_RISCV_ISA_V_DEFAULT_ENABLE=y
+CONFIG_RISCV_ISA_ZBB=y
+CONFIG_RISCV_ISA_ZICBOZ=y
 CONFIG_RISCV_ISA_ZICBOM=y
 CONFIG_RISCV_SBI=y
 CONFIG_RISCV_SBI_V01=y
@@ -352,6 +364,7 @@ CONFIG_SWPHY=y
 CONFIG_SYSCTL_EXCEPTION_TRACE=y
 # CONFIG_SYSFB_SIMPLEFB is not set
 CONFIG_THREAD_INFO_IN_TASK=y
+CONFIG_THREAD_SIZE_ORDER=2
 CONFIG_TICK_CPU_ACCOUNTING=y
 CONFIG_TIMER_OF=y
 CONFIG_TIMER_PROBE=y