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-rw-r--r--package/boot/uboot-sifiveu/Makefile63
-rw-r--r--package/boot/uboot-sifiveu/patches/0002-board-sifive-spl-Initialized-the-PWM-setting-in-the-.patch104
-rw-r--r--package/boot/uboot-sifiveu/patches/0003-board-sifive-Set-LED-s-color-to-purple-in-the-U-boot.patch68
-rw-r--r--package/boot/uboot-sifiveu/patches/0004-board-sifive-Set-LED-s-color-to-blue-before-jumping-.patch30
-rw-r--r--package/boot/uboot-sifiveu/patches/0005-board-sifive-spl-Set-remote-thermal-of-TMP451-to-85-.patch111
-rw-r--r--package/boot/uboot-sifiveu/patches/0008-riscv-dts-Add-few-PMU-events.patch36
-rw-r--r--package/boot/uboot-sifiveu/patches/0009-riscv-Fix-build-against-binutils.patch50
-rw-r--r--package/boot/uboot-sifiveu/patches/100-mkimage-check-environment-for-dtc-binary-location.patch35
-rw-r--r--package/boot/uboot-sifiveu/patches/110-no-kwbimage.patch10
-rw-r--r--package/boot/uboot-sifiveu/patches/130-fix-mkimage-host-build.patch24
-rw-r--r--package/boot/uboot-sifiveu/patches/300-force-pylibfdt-build.patch30
-rw-r--r--package/boot/uboot-sifiveu/uEnv-default.txt5
12 files changed, 566 insertions, 0 deletions
diff --git a/package/boot/uboot-sifiveu/Makefile b/package/boot/uboot-sifiveu/Makefile
new file mode 100644
index 0000000000..5def1c1fcb
--- /dev/null
+++ b/package/boot/uboot-sifiveu/Makefile
@@ -0,0 +1,63 @@
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# Copyright (C) 2022 OpenWrt.org
+#
+
+include $(TOPDIR)/rules.mk
+include $(INCLUDE_DIR)/kernel.mk
+
+PKG_RELEASE:=1
+PKG_VERSION:=2022.10
+PKG_HASH:=50b4482a505bc281ba8470c399a3c26e145e29b23500bc35c50debd7fa46bdf8
+
+include $(INCLUDE_DIR)/u-boot.mk
+include $(INCLUDE_DIR)/package.mk
+
+define U-Boot/Default
+ BUILD_TARGET:=sifiveu
+ BUILD_DEVICES=$(1)
+ UBOOT_IMAGE:=u-boot.itb
+ DTS_DIR:=arch/riscv/dts
+ UENV:=default
+ DEFAULT:=y
+endef
+
+define U-Boot/sifive_unleashed
+ NAME:=SiFive Unleashed
+ OPENSBI:=generic
+ DEPENDS:=+opensbi_generic
+ UBOOT_DTS:=hifive-unleashed-a00.dtb
+ BUILD_DEVICES:=sifive_unleashed
+endef
+
+define U-Boot/sifive_unmatched
+ NAME:=SiFive Unmatched
+ OPENSBI:=generic
+ DEPENDS:=+opensbi_generic
+ UBOOT_DTS:=hifive-unmatched-a00.dtb
+ BUILD_DEVICES:=sifive_unmatched
+endef
+
+UBOOT_TARGETS := \
+ sifive_unleashed \
+ sifive_unmatched
+
+UBOOT_MAKE_FLAGS += \
+ OPENSBI=$(STAGING_DIR_IMAGE)/fw_dynamic-${OPENSBI}.bin
+
+define Build/Configure
+ $(call Build/Configure/U-Boot)
+ sed -i 's/CONFIG_TOOLS_LIBCRYPTO=y/# CONFIG_TOOLS_LIBCRYPTO is not set/' $(PKG_BUILD_DIR)/.config
+endef
+
+define Build/InstallDev
+ $(INSTALL_DIR) $(STAGING_DIR_IMAGE)
+ $(INSTALL_BIN) $(PKG_BUILD_DIR)/$(UBOOT_IMAGE) $(STAGING_DIR_IMAGE)/$(BUILD_VARIANT)-$(UBOOT_IMAGE)
+ $(INSTALL_BIN) $(PKG_BUILD_DIR)/spl/u-boot-spl.bin $(STAGING_DIR_IMAGE)/$(BUILD_VARIANT)-$(UBOOT_IMAGE)-spl
+ $(INSTALL_BIN) $(PKG_BUILD_DIR)/$(DTS_DIR)/$(UBOOT_DTS) $(STAGING_DIR_IMAGE)/$(UBOOT_DTS)
+
+ mkimage -C none -A arm -T script -d uEnv-$(UENV).txt \
+ $(STAGING_DIR_IMAGE)/$(BUILD_DEVICES)-boot.scr
+endef
+
+$(eval $(call BuildPackage/U-Boot))
diff --git a/package/boot/uboot-sifiveu/patches/0002-board-sifive-spl-Initialized-the-PWM-setting-in-the-.patch b/package/boot/uboot-sifiveu/patches/0002-board-sifive-spl-Initialized-the-PWM-setting-in-the-.patch
new file mode 100644
index 0000000000..27cda75326
--- /dev/null
+++ b/package/boot/uboot-sifiveu/patches/0002-board-sifive-spl-Initialized-the-PWM-setting-in-the-.patch
@@ -0,0 +1,104 @@
+From 725595e667cc4423347c255da8ca4c5b3aa0980a Mon Sep 17 00:00:00 2001
+From: Vincent Chen <vincent.chen@sifive.com>
+Date: Mon, 15 Nov 2021 03:31:04 -0800
+Subject: [PATCH 2/8] board: sifive: spl: Initialized the PWM setting in the
+ SPL stage
+
+LEDs and multiple fans can be controlled by SPL. This patch ensures
+that all fans have been enabled in the SPL stage. In addition, the
+LED's color will be set to yellow.
+---
+ board/sifive/unmatched/Makefile | 1 +
+ board/sifive/unmatched/pwm.c | 57 +++++++++++++++++++++++++++++++++
+ board/sifive/unmatched/spl.c | 2 ++
+ 3 files changed, 60 insertions(+)
+ create mode 100644 board/sifive/unmatched/pwm.c
+
+diff --git a/board/sifive/unmatched/Makefile b/board/sifive/unmatched/Makefile
+index 1345330089..5df01982e9 100644
+--- a/board/sifive/unmatched/Makefile
++++ b/board/sifive/unmatched/Makefile
+@@ -9,3 +9,4 @@ obj-y += spl.o
+ else
+ obj-y += unmatched.o
+ endif
++obj-y += pwm.o
+diff --git a/board/sifive/unmatched/pwm.c b/board/sifive/unmatched/pwm.c
+new file mode 100644
+index 0000000000..e1cc02310a
+--- /dev/null
++++ b/board/sifive/unmatched/pwm.c
+@@ -0,0 +1,57 @@
++// SPDX-License-Identifier: GPL-2.0+
++/*
++ * Copyright (c) 2021, SiFive Inc
++ *
++ * Authors:
++ * Vincent Chen <vincent.chen@sifive.com>
++ * David Abdurachmanov <david.abdurachmanov@sifive.com>
++ */
++
++#include <linux/io.h>
++#include <asm/arch/eeprom.h>
++
++struct pwm_sifive_regs {
++ unsigned int cfg; /* PWM configuration register */
++ unsigned int pad0; /* Reserved */
++ unsigned int cnt; /* PWM count register */
++ unsigned int pad1; /* Reserved */
++ unsigned int pwms; /* Scaled PWM count register */
++ unsigned int pad2; /* Reserved */
++ unsigned int pad3; /* Reserved */
++ unsigned int pad4; /* Reserved */
++ unsigned int cmp0; /* PWM 0 compare register */
++ unsigned int cmp1; /* PWM 1 compare register */
++ unsigned int cmp2; /* PWM 2 compare register */
++ unsigned int cmp3; /* PWM 3 compare register */
++};
++
++#define PWM0_BASE 0x10020000
++#define PWM1_BASE 0x10021000
++#define PWM_CFG_INIT 0x1000
++#define PWM_CMP_ENABLE_VAL 0x0
++#define PWM_CMP_DISABLE_VAL 0xffff
++
++void pwm_device_init(void)
++{
++ struct pwm_sifive_regs *pwm0, *pwm1;
++ pwm0 = (struct pwm_sifive_regs *)PWM0_BASE;
++ pwm1 = (struct pwm_sifive_regs *)PWM1_BASE;
++ writel(PWM_CMP_DISABLE_VAL, (void *)&pwm0->cmp0);
++ /* Set the 3-color PWM LEDs to yellow in SPL */
++ writel(PWM_CMP_ENABLE_VAL, (void *)&pwm0->cmp1);
++ writel(PWM_CMP_ENABLE_VAL, (void *)&pwm0->cmp2);
++ writel(PWM_CMP_DISABLE_VAL, (void *)&pwm0->cmp3);
++ writel(PWM_CFG_INIT, (void *)&pwm0->cfg);
++
++ writel(PWM_CMP_DISABLE_VAL, (void *)&pwm0->cmp3);
++ /* Turn on all the fans, (J21), (J23) and (J24), on the unmatched board */
++ /* The SoC fan(J21) on the rev3 board cannot be controled by PWM_COMP0,
++ so here sets the initial value of PWM_COMP0 as DISABLE */
++ if (get_pcb_revision_from_eeprom() == PCB_REVISION_REV3)
++ writel(PWM_CMP_DISABLE_VAL, (void *)&pwm1->cmp1);
++ else
++ writel(PWM_CMP_ENABLE_VAL, (void *)&pwm1->cmp1);
++ writel(PWM_CMP_ENABLE_VAL, (void *)&pwm1->cmp2);
++ writel(PWM_CMP_ENABLE_VAL, (void *)&pwm1->cmp3);
++ writel(PWM_CFG_INIT, (void *)&pwm1->cfg);
++}
+diff --git a/board/sifive/unmatched/spl.c b/board/sifive/unmatched/spl.c
+index 7c0beedc08..f3a661a81e 100644
+--- a/board/sifive/unmatched/spl.c
++++ b/board/sifive/unmatched/spl.c
+@@ -90,6 +90,8 @@ int spl_board_init_f(void)
+ goto end;
+ }
+
++ pwm_device_init();
++
+ ret = spl_gemgxl_init();
+ if (ret) {
+ debug("Gigabit ethernet PHY (VSC8541) init failed: %d\n", ret);
+--
+2.27.0
+
diff --git a/package/boot/uboot-sifiveu/patches/0003-board-sifive-Set-LED-s-color-to-purple-in-the-U-boot.patch b/package/boot/uboot-sifiveu/patches/0003-board-sifive-Set-LED-s-color-to-purple-in-the-U-boot.patch
new file mode 100644
index 0000000000..9820d2e2f9
--- /dev/null
+++ b/package/boot/uboot-sifiveu/patches/0003-board-sifive-Set-LED-s-color-to-purple-in-the-U-boot.patch
@@ -0,0 +1,68 @@
+From 7ead6d662a2f9d8498af6650ea38418c64b52048 Mon Sep 17 00:00:00 2001
+From: Vincent Chen <vincent.chen@sifive.com>
+Date: Mon, 24 Jan 2022 02:42:02 -0800
+Subject: [PATCH 3/8] board: sifive: Set LED's color to purple in the U-boot
+ stage
+
+Set LED's color to purple in the U-boot stage. Because there are still
+some functions to be executed before board_early_init_f(), it means
+the LED's is not changed to purple instantly when entering the U-boot
+stage.
+---
+ board/sifive/unmatched/pwm.c | 7 +++++++
+ board/sifive/unmatched/unmatched.c | 6 ++++++
+ configs/sifive_unmatched_defconfig | 1 +
+ 3 files changed, 14 insertions(+)
+
+diff --git a/board/sifive/unmatched/pwm.c b/board/sifive/unmatched/pwm.c
+index e1cc02310a..bd67672c22 100644
+--- a/board/sifive/unmatched/pwm.c
++++ b/board/sifive/unmatched/pwm.c
+@@ -36,6 +36,7 @@ void pwm_device_init(void)
+ struct pwm_sifive_regs *pwm0, *pwm1;
+ pwm0 = (struct pwm_sifive_regs *)PWM0_BASE;
+ pwm1 = (struct pwm_sifive_regs *)PWM1_BASE;
++#ifdef CONFIG_SPL_BUILD
+ writel(PWM_CMP_DISABLE_VAL, (void *)&pwm0->cmp0);
+ /* Set the 3-color PWM LEDs to yellow in SPL */
+ writel(PWM_CMP_ENABLE_VAL, (void *)&pwm0->cmp1);
+@@ -54,4 +55,10 @@ void pwm_device_init(void)
+ writel(PWM_CMP_ENABLE_VAL, (void *)&pwm1->cmp2);
+ writel(PWM_CMP_ENABLE_VAL, (void *)&pwm1->cmp3);
+ writel(PWM_CFG_INIT, (void *)&pwm1->cfg);
++#else
++ /* Set the 3-color PWM LEDs to purple in U-boot */
++ writel(PWM_CMP_DISABLE_VAL, (void *)&pwm0->cmp1);
++ writel(PWM_CMP_ENABLE_VAL, (void *)&pwm0->cmp2);
++ writel(PWM_CMP_ENABLE_VAL, (void *)&pwm0->cmp3);
++#endif
+ }
+diff --git a/board/sifive/unmatched/unmatched.c b/board/sifive/unmatched/unmatched.c
+index 6295deeae2..30c082d001 100644
+--- a/board/sifive/unmatched/unmatched.c
++++ b/board/sifive/unmatched/unmatched.c
+@@ -22,6 +22,12 @@ void *board_fdt_blob_setup(int *err)
+ return (ulong *)&_end;
+ }
+
++int board_early_init_f(void)
++{
++ pwm_device_init();
++ return 0;
++}
++
+ int board_init(void)
+ {
+ /* enable all cache ways */
+diff --git a/configs/sifive_unmatched_defconfig b/configs/sifive_unmatched_defconfig
+index d400ed0b23..0758f8e90f 100644
+--- a/configs/sifive_unmatched_defconfig
++++ b/configs/sifive_unmatched_defconfig
+@@ -51,3 +51,4 @@ CONFIG_DM_SCSI=y
+ CONFIG_USB=y
+ CONFIG_USB_XHCI_HCD=y
+ CONFIG_USB_XHCI_PCI=y
++CONFIG_BOARD_EARLY_INIT_F=y
+--
+2.27.0
+
diff --git a/package/boot/uboot-sifiveu/patches/0004-board-sifive-Set-LED-s-color-to-blue-before-jumping-.patch b/package/boot/uboot-sifiveu/patches/0004-board-sifive-Set-LED-s-color-to-blue-before-jumping-.patch
new file mode 100644
index 0000000000..b5bffd22bd
--- /dev/null
+++ b/package/boot/uboot-sifiveu/patches/0004-board-sifive-Set-LED-s-color-to-blue-before-jumping-.patch
@@ -0,0 +1,30 @@
+From 6ef7023c0dcfde320015ab19e0e0d423921be77d Mon Sep 17 00:00:00 2001
+From: Vincent Chen <vincent.chen@sifive.com>
+Date: Mon, 15 Nov 2021 03:39:07 -0800
+Subject: [PATCH 1/2] board: sifive: Set LED's color to blue before jumping to
+ Linux
+
+The LED's color wil be changed from purple to blue before executing
+the sysboot command. Because the sysboot command includes the image loading
+from the boot partition, It means the LED's color is blue when executing
+"Retrieving file: /Image.gz".
+---
+ include/configs/sifive-unmatched.h | 7 ++++++-
+ 1 file changed, 6 insertions(+), 1 deletion(-)
+
+--- a/include/configs/sifive-unmatched.h
++++ b/include/configs/sifive-unmatched.h
+@@ -49,7 +49,12 @@
+ "type_guid_gpt_system=" TYPE_GUID_SYSTEM "\0" \
+ "partitions=" PARTS_DEFAULT "\0" \
+ "fdtfile=" CONFIG_DEFAULT_FDT_FILE "\0" \
+- BOOTENV
++ "setled_blue=mw.l 0x10020024 0x0000ffff; mw.l 0x10020028 0x0000ffff; mw.l 0x1002002c 0x0\0" \
++ BOOTENV \
++ "boot_extlinux=" \
++ "run setled_blue; " \
++ "sysboot ${devtype} ${devnum}:${distro_bootpart} any " \
++ "${scriptaddr} ${prefix}${boot_syslinux_conf};\0"
+
+ #define CONFIG_SYS_EEPROM_BUS_NUM 0
+
diff --git a/package/boot/uboot-sifiveu/patches/0005-board-sifive-spl-Set-remote-thermal-of-TMP451-to-85-.patch b/package/boot/uboot-sifiveu/patches/0005-board-sifive-spl-Set-remote-thermal-of-TMP451-to-85-.patch
new file mode 100644
index 0000000000..dc0d04151f
--- /dev/null
+++ b/package/boot/uboot-sifiveu/patches/0005-board-sifive-spl-Set-remote-thermal-of-TMP451-to-85-.patch
@@ -0,0 +1,111 @@
+From 07f84ed283b913cbdf87181ae2ed65467d923df5 Mon Sep 17 00:00:00 2001
+From: Vincent Chen <vincent.chen@sifive.com>
+Date: Mon, 24 Jan 2022 02:57:40 -0800
+Subject: [PATCH 2/2] board: sifive: spl: Set remote thermal of TMP451 to 85
+ deg C for the unmatched board
+
+For TMP451 on the unmatched board, the default value of the remote
+thermal threshold is 108 deg C. This commit initilizes it to 85 deg C at SPL.
+---
+ board/sifive/unmatched/spl.c | 29 +++++++++++++++++++++++++++++
+ drivers/misc/Kconfig | 10 ++++++++++
+ include/configs/sifive-unmatched.h | 4 ++++
+ scripts/config_whitelist.txt | 1 +
+ 4 files changed, 44 insertions(+)
+
+--- a/board/sifive/unmatched/spl.c
++++ b/board/sifive/unmatched/spl.c
+@@ -10,6 +10,8 @@
+ #include <spl.h>
+ #include <misc.h>
+ #include <log.h>
++#include <config.h>
++#include <i2c.h>
+ #include <linux/delay.h>
+ #include <linux/io.h>
+ #include <asm/gpio.h>
+@@ -26,6 +28,27 @@
+ #define MODE_SELECT_SD 0xb
+ #define MODE_SELECT_MASK GENMASK(3, 0)
+
++#define TMP451_REMOTE_THERM_LIMIT_REG_OFFSET 0x19
++#define TMP451_REMOTE_THERM_LIMIT_INIT_VALUE 0x55
++
++static inline int init_tmp451_remote_therm_limit(void)
++{
++ struct udevice *dev;
++ unsigned char r_therm_limit = TMP451_REMOTE_THERM_LIMIT_INIT_VALUE;
++ int ret;
++
++ ret = i2c_get_chip_for_busnum(CONFIG_SYS_TMP451_BUS_NUM,
++ CONFIG_SYS_I2C_TMP451_ADDR,
++ CONFIG_SYS_I2C_TMP451_ADDR_LEN,
++ &dev);
++
++ if (!ret)
++ ret = dm_i2c_write(dev, TMP451_REMOTE_THERM_LIMIT_REG_OFFSET,
++ &r_therm_limit,
++ sizeof(unsigned char));
++ return ret;
++}
++
+ static inline int spl_reset_device_by_gpio(const char *label, int pin, int low_width)
+ {
+ int ret;
+@@ -92,6 +115,12 @@ int spl_board_init_f(void)
+
+ pwm_device_init();
+
++ ret = init_tmp451_remote_therm_limit();
++ if (ret) {
++ debug("TMP451 remote THERM limit init failed: %d\n", ret);
++ goto end;
++ }
++
+ ret = spl_gemgxl_init();
+ if (ret) {
+ debug("Gigabit ethernet PHY (VSC8541) init failed: %d\n", ret);
+--- a/drivers/misc/Kconfig
++++ b/drivers/misc/Kconfig
+@@ -536,8 +536,18 @@ config SYS_I2C_EEPROM_ADDR
+ depends on ID_EEPROM || I2C_EEPROM || SPL_I2C_EEPROM || CMD_EEPROM || ENV_IS_IN_EEPROM
+ default 0
+
++config SYS_I2C_TMP451_ADDR
++ hex "Chip address of the TMP451 device"
++ default 0
++
+ if I2C_EEPROM
+
++config SYS_I2C_TMP451_ADDR_LEN
++ int "Length in bytes of the TMP451 memory array address"
++ default 1
++ help
++ Note: This is NOT the chip address length!
++
+ config SYS_I2C_EEPROM_ADDR_OVERFLOW
+ hex "EEPROM Address Overflow"
+ default 0x0
+--- a/include/configs/sifive-unmatched.h
++++ b/include/configs/sifive-unmatched.h
+@@ -15,6 +15,10 @@
+
+ #define CONFIG_STANDALONE_LOAD_ADDR 0x80200000
+
++#define CONFIG_SYS_TMP451_BUS_NUM 0
++#define CONFIG_SYS_I2C_TMP451_ADDR 0x4c
++#define CONFIG_SYS_I2C_TMP451_ADDR_LEN 0x1
++
+ /* Environment options */
+
+ #define BOOT_TARGET_DEVICES(func) \
+--- a/scripts/config_whitelist.txt
++++ b/scripts/config_whitelist.txt
+@@ -1268,6 +1268,7 @@ CONFIG_SYS_TIMER_BASE
+ CONFIG_SYS_TIMER_COUNTER
+ CONFIG_SYS_TIMER_COUNTS_DOWN
+ CONFIG_SYS_TIMER_RATE
++CONFIG_SYS_TMP451_BUS_NUM
+ CONFIG_SYS_TMPVIRT
+ CONFIG_SYS_TSEC1_OFFSET
+ CONFIG_SYS_TX_ETH_BUFFER
diff --git a/package/boot/uboot-sifiveu/patches/0008-riscv-dts-Add-few-PMU-events.patch b/package/boot/uboot-sifiveu/patches/0008-riscv-dts-Add-few-PMU-events.patch
new file mode 100644
index 0000000000..3f3feb9da7
--- /dev/null
+++ b/package/boot/uboot-sifiveu/patches/0008-riscv-dts-Add-few-PMU-events.patch
@@ -0,0 +1,36 @@
+From c29e4d84cfa17ab96eff2a9044f486ba3c8b5c43 Mon Sep 17 00:00:00 2001
+From: Atish Patra <atish.patra@wdc.com>
+Date: Mon, 25 Oct 2021 11:35:41 -0700
+Subject: [PATCH] riscv: dts: Add few PMU events
+
+fu740 has 2 HPM counters and many HPM events defined in the fu740 manual[1].
+This patch adds some of these events and their mapping as per the
+OpenSBI PMU DT binding for now.
+
+[1]https://sifive.cdn.prismic.io/sifive/de1491e5-077c-461d-9605-e8a0ce57337d_fu740-c000-manual-v1p3.pdf
+
+Signed-off-by: Atish Patra <atish.patra@wdc.com>
+---
+ arch/riscv/dts/fu740-c000.dtsi | 11 +++++++++++
+ 1 file changed, 11 insertions(+)
+
+--- a/arch/riscv/dts/fu740-c000.dtsi
++++ b/arch/riscv/dts/fu740-c000.dtsi
+@@ -140,6 +140,17 @@
+ #size-cells = <2>;
+ compatible = "simple-bus";
+ ranges;
++ pmu {
++ compatible = "riscv,pmu";
++ riscv,raw-event-to-mhpmcounters = <0x00000000 0x200 0x18
++ 0x00000000 0x400 0x18
++ 0x00000000 0x800 0x18>;
++ riscv,event-to-mhpmcounters = <0x05 0x06 0x18
++ 0x10009 0x10009 0x18>;
++ riscv,event-to-mhpmevent = <0x05 0x00000000 0x4000
++ 0x06 0x00000000 0x4001
++ 0x10008 0x00000000 0x102>;
++ };
+ plic0: interrupt-controller@c000000 {
+ #interrupt-cells = <1>;
+ #address-cells = <0>;
diff --git a/package/boot/uboot-sifiveu/patches/0009-riscv-Fix-build-against-binutils.patch b/package/boot/uboot-sifiveu/patches/0009-riscv-Fix-build-against-binutils.patch
new file mode 100644
index 0000000000..87dbf984ec
--- /dev/null
+++ b/package/boot/uboot-sifiveu/patches/0009-riscv-Fix-build-against-binutils.patch
@@ -0,0 +1,50 @@
+commit 1dde977518f13824b847e23275001191139bc384
+Author: Alexandre Ghiti <alexandre.ghiti@canonical.com>
+Date: Mon Oct 3 18:07:54 2022 +0200
+
+ riscv: Fix build against binutils 2.38
+
+ The following description is copied from the equivalent patch for the
+ Linux Kernel proposed by Aurelien Jarno:
+
+ >From version 2.38, binutils default to ISA spec version 20191213. This
+ means that the csr read/write (csrr*/csrw*) instructions and fence.i
+ instruction has separated from the `I` extension, become two standalone
+ extensions: Zicsr and Zifencei. As the kernel uses those instruction,
+ this causes the following build failure:
+
+ arch/riscv/cpu/mtrap.S: Assembler messages:
+ arch/riscv/cpu/mtrap.S:65: Error: unrecognized opcode `csrr a0,scause'
+ arch/riscv/cpu/mtrap.S:66: Error: unrecognized opcode `csrr a1,sepc'
+ arch/riscv/cpu/mtrap.S:67: Error: unrecognized opcode `csrr a2,stval'
+ arch/riscv/cpu/mtrap.S:70: Error: unrecognized opcode `csrw sepc,a0'
+
+ Signed-off-by: Alexandre Ghiti <alexandre.ghiti@canonical.com>
+ Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
+ Tested-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
+ Tested-by: Heiko Stuebner <heiko@sntech.de>
+ Tested-by: Christian Stewart <christian@paral.in>
+ Reviewed-by: Rick Chen <rick@andestech.com>
+
+diff --git a/arch/riscv/Makefile b/arch/riscv/Makefile
+index 0b80eb8d86..53d1194ffb 100644
+--- a/arch/riscv/Makefile
++++ b/arch/riscv/Makefile
+@@ -24,7 +24,16 @@ ifeq ($(CONFIG_CMODEL_MEDANY),y)
+ CMODEL = medany
+ endif
+
+-ARCH_FLAGS = -march=$(ARCH_BASE)$(ARCH_A)$(ARCH_C) -mabi=$(ABI) \
++RISCV_MARCH = $(ARCH_BASE)$(ARCH_A)$(ARCH_C)
++
++# Newer binutils versions default to ISA spec version 20191213 which moves some
++# instructions from the I extension to the Zicsr and Zifencei extensions.
++toolchain-need-zicsr-zifencei := $(call cc-option-yn, -mabi=$(ABI) -march=$(RISCV_MARCH)_zicsr_zifencei)
++ifeq ($(toolchain-need-zicsr-zifencei),y)
++ RISCV_MARCH := $(RISCV_MARCH)_zicsr_zifencei
++endif
++
++ARCH_FLAGS = -march=$(RISCV_MARCH) -mabi=$(ABI) \
+ -mcmodel=$(CMODEL)
+
+ PLATFORM_CPPFLAGS += $(ARCH_FLAGS)
diff --git a/package/boot/uboot-sifiveu/patches/100-mkimage-check-environment-for-dtc-binary-location.patch b/package/boot/uboot-sifiveu/patches/100-mkimage-check-environment-for-dtc-binary-location.patch
new file mode 100644
index 0000000000..482aa1a369
--- /dev/null
+++ b/package/boot/uboot-sifiveu/patches/100-mkimage-check-environment-for-dtc-binary-location.patch
@@ -0,0 +1,35 @@
+From 637800493945ffed2f454756300437a4ec86e3b1 Mon Sep 17 00:00:00 2001
+From: Hauke Mehrtens <hauke@hauke-m.de>
+Date: Wed, 19 Jul 2017 22:23:15 +0200
+Subject: mkimage: check environment for dtc binary location
+
+Currently mkimage assumes the dtc binary is in the path and fails
+otherwise. This patch makes it check the DTC environment variable first
+for the dtc binary and then fall back to the default path. This makes
+it possible to call the u-boot build with make DTC=... and build a fit
+image with the dtc binary not being the the default path.
+
+Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
+Cc: Simon Glass <sjg@chromium.org>
+---
+ tools/fit_image.c | 7 ++++++-
+ 1 file changed, 6 insertions(+), 1 deletion(-)
+
+--- a/tools/fit_image.c
++++ b/tools/fit_image.c
+@@ -726,9 +726,14 @@ static int fit_handle_file(struct image_
+ }
+ *cmd = '\0';
+ } else if (params->datafile) {
++ const char* dtc = getenv("DTC");
++
++ if (!dtc)
++ dtc = MKIMAGE_DTC;
++
+ /* dtc -I dts -O dtb -p 500 -o tmpfile datafile */
+ snprintf(cmd, sizeof(cmd), "%s %s -o \"%s\" \"%s\"",
+- MKIMAGE_DTC, params->dtc, tmpfile, params->datafile);
++ dtc, params->dtc, tmpfile, params->datafile);
+ debug("Trying to execute \"%s\"\n", cmd);
+ } else {
+ snprintf(cmd, sizeof(cmd), "cp \"%s\" \"%s\"",
diff --git a/package/boot/uboot-sifiveu/patches/110-no-kwbimage.patch b/package/boot/uboot-sifiveu/patches/110-no-kwbimage.patch
new file mode 100644
index 0000000000..65d14f5bec
--- /dev/null
+++ b/package/boot/uboot-sifiveu/patches/110-no-kwbimage.patch
@@ -0,0 +1,10 @@
+--- a/tools/Makefile
++++ b/tools/Makefile
+@@ -119,7 +119,6 @@ dumpimage-mkimage-objs := aisimage.o \
+ imximage.o \
+ imx8image.o \
+ imx8mimage.o \
+- kwbimage.o \
+ lib/md5.o \
+ lpc32xximage.o \
+ mxsimage.o \
diff --git a/package/boot/uboot-sifiveu/patches/130-fix-mkimage-host-build.patch b/package/boot/uboot-sifiveu/patches/130-fix-mkimage-host-build.patch
new file mode 100644
index 0000000000..cd65c1321f
--- /dev/null
+++ b/package/boot/uboot-sifiveu/patches/130-fix-mkimage-host-build.patch
@@ -0,0 +1,24 @@
+--- a/tools/image-host.c
++++ b/tools/image-host.c
+@@ -1125,6 +1125,7 @@ static int fit_config_add_verification_d
+ * 2) get public key (X509_get_pubkey)
+ * 3) provide der format (d2i_RSAPublicKey)
+ */
++#ifdef CONFIG_TOOLS_LIBCRYPTO
+ static int read_pub_key(const char *keydir, const void *name,
+ unsigned char **pubkey, int *pubkey_len)
+ {
+@@ -1178,6 +1179,13 @@ err_cert:
+ fclose(f);
+ return ret;
+ }
++#else
++static int read_pub_key(const char *keydir, const void *name,
++ unsigned char **pubkey, int *pubkey_len)
++{
++ return -ENOSYS;
++}
++#endif
+
+ int fit_pre_load_data(const char *keydir, void *keydest, void *fit)
+ {
diff --git a/package/boot/uboot-sifiveu/patches/300-force-pylibfdt-build.patch b/package/boot/uboot-sifiveu/patches/300-force-pylibfdt-build.patch
new file mode 100644
index 0000000000..4abf13eda8
--- /dev/null
+++ b/package/boot/uboot-sifiveu/patches/300-force-pylibfdt-build.patch
@@ -0,0 +1,30 @@
+--- a/Makefile
++++ b/Makefile
+@@ -2028,26 +2028,7 @@ endif
+ # Check dtc and pylibfdt, if DTC is provided, else build them
+ PHONY += scripts_dtc
+ scripts_dtc: scripts_basic
+- $(Q)if test "$(DTC)" = "$(DTC_INTREE)"; then \
+- $(MAKE) $(build)=scripts/dtc; \
+- else \
+- if ! $(DTC) -v >/dev/null; then \
+- echo '*** Failed to check dtc version: $(DTC)'; \
+- false; \
+- else \
+- if test "$(call dtc-version)" -lt $(DTC_MIN_VERSION); then \
+- echo '*** Your dtc is too old, please upgrade to dtc $(DTC_MIN_VERSION) or newer'; \
+- false; \
+- else \
+- if [ -n "$(CONFIG_PYLIBFDT)" ]; then \
+- if ! echo "import libfdt" | $(PYTHON3) 2>/dev/null; then \
+- echo '*** pylibfdt does not seem to be available with $(PYTHON3)'; \
+- false; \
+- fi; \
+- fi; \
+- fi; \
+- fi; \
+- fi
++ $(MAKE) $(build)=scripts/dtc
+
+ # ---------------------------------------------------------------------------
+ quiet_cmd_cpp_lds = LDS $@
diff --git a/package/boot/uboot-sifiveu/uEnv-default.txt b/package/boot/uboot-sifiveu/uEnv-default.txt
new file mode 100644
index 0000000000..8468a3cace
--- /dev/null
+++ b/package/boot/uboot-sifiveu/uEnv-default.txt
@@ -0,0 +1,5 @@
+setenv loadkernel fatload mmc 0:3 \$kernel_addr_r Image
+setenv loaddtb fatload mmc 0:3 \$fdt_addr_r dtb
+setenv bootargs console=ttySIF0,115200 earlycon=sbi root=/dev/mmcblk0p4 rootwait
+setenv uenvcmd run loadkernel \&\& run loaddtb \&\& booti \$kernel_addr_r - \$fdt_addr_r
+run uenvcmd