https://elixir.bootlin.com/u-boot

1. git clone git@gitee.com:kong-ling/u-boot.git # clone u-boot from gitee

2. git tag -l 'v2019.07' #查看tag v2019.07， 是bitbake中使用的version

3. git show v2019.07， 确认commit id
   commit id commit e5aee22e4be75e75a854ab64503fc80598bc2004 (HEAD, tag: v2019.07)

4. 切换到tag: v2019.07
   git checkout v2019.07

5. git am 0001xxxxx.patch # patch u-boot, 打入补丁

修复mac 下 make menuconfig 的bug以及自定义make menuconfig界面

ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

method 1

1. mkdir /home/lcao/uboot_e21/

2. copy -r /home/lcao/offline/SiFive-OE/riscv-sifive/build/tmp-glibc/work/freedom_u540-oe-linux/u-boot/1_2019.07-r0/git /home/lcao/uboot_e21/

3. mv /home/lcao/uboot_e21/git /home/lcao/uboot_e21/src/

4. mkdir /home/lcao/uboot_e21/build/

5. copy your .config to /home/lcao/uboot_e21/build/
   5.1 modify "Base ISA" by:
   make -C /home/lcao/uboot_e21/src O=/home/lcao/uboot_e21/build/ menuconfig
   RISC-V architecture-->Base ISA, modify to RV32I
   then exit and save.

6. cd /home/lcao/uboot_e21/build/, run:
   make --sysroot=/home/lcao/offline/SiFive-OE/riscv-sifive/build/tmp-glibc/work/freedom_u540-oe-linux/u-boot/1_2019.07-r0/recipe-sysroot" HOSTCC="gcc -isystem/home/lcao/offline/SiFive-OE/riscv-sifive/build/tmp-glibc/work/freedom_u540-oe-linux/u-boot/1_2019.07-r0/recipe-sysroot-native/usr/include -O2 -pipe -L/home/lcao/offline/SiFive-OE/riscv-sifive/build/tmp-glibc/work/freedom_u540-oe-linux/u-boot/1_2019.07-r0/recipe-sysroot-native/usr/lib -L/home/lcao/offline/SiFive-OE/riscv-sifive/build/tmp-glibc/work/freedom_u540-oe-linux/u-boot/1_2019.07-r0/recipe-sysroot-native/lib -Wl,--enable-new-dtags -Wl,-rpath-link,/home/lcao/offline/SiFive-OE/riscv-sifive/build/tmp-glibc/work/freedom_u540-oe-linux/u-boot/1_2019.07-r0/recipe-sysroot-native/usr/lib -Wl,-rpath-link,/home/lcao/offline/SiFive-OE/riscv-sifive/build/tmp-glibc/work/freedom_u540-oe-linux/u-boot/1_2019.07-r0/recipe-sysroot-native/lib -Wl,-rpath,/home/lcao/offline/SiFive-OE/riscv-sifive/build/tmp-glibc/work/freedom_u540-oe-linux/u-boot/1_2019.07-r0/recipe-sysroot-native/usr/lib -Wl,-rpath,/home/lcao/offline/SiFive-OE/riscv-sifive/build/tmp-glibc/work/freedom_u540-oe-linux/u-boot/1_2019.07-r0/recipe-sysroot-native/lib -Wl,-O1 -Wl,--allow-shlib-undefined -Wl,--dynamic-linker=/home/lcao/offline/SiFive-OE/riscv-sifive/build/tmp-glibc/sysroots-uninative/x86_64-linux/lib/ld-linux-x86-64.so.2" PYTHON2=nativepython STAGING_INCDIR=/home/lcao/offline/SiFive-OE/riscv-sifive/build/tmp-glibc/work/freedom_u540-oe-linux/u-boot/1_2019.07-r0/recipe-sysroot-native/usr/include STAGING_LIBDIR=/home/lcao/offline/SiFive-OE/riscv-sifive/build/tmp-glibc/work/freedom_u540-oe-linux/u-boot/1_2019.07-r0/recipe-sysroot-native/usr/lib V=1 -C /home/lcao/uboot_e21/src/ O=/home/lcao/uboot_e21/build/

7. for error "make[2]: *** [arch/riscv/dts/ux00_zsbl.dtb] Error 1"
   copy ux00_zsbl.dtb /home/lcao/uboot_e21/build/arch/riscv/dts/

method 2

riscv64-unknown-elf-gcc-8.3.0-2019.08.0-x86_64-linux-centos6 toolchains also can be used to generate uboot for E21:

1. mkdir /home/lcao/uboot_unknown/

2. copy -r ``/home/lcao/offline/SiFive-OE/riscv-sifive/build/tmp-glibc/work/freedom_u540-oe-linux/u-boot/1_2019.07-r0/git/home/lcao/uboot_unknown`/

3. mv /home/lcao/uboot_unknown/git /home/lcao/uboot_unknown/src/

4. mkdir /home/lcao/uboot_unknown/build/

5. copy your .config to /home/lcao/uboot_unknown/build/
   5.1 modify "Base ISA" by:
   make -C /home/lcao/uboot_unknown/src O=/home/lcao/uboot_unknown/build/ menuconfig
   RISC-V architecture-->Base ISA, modify to RV32I
   then exit and save.

6. modify /home/lcao/uboot_unknown/src/scripts/Makefile.lib file, Line 381, remove -shared
   cmd_efi_ld = (EFI_LDS_PATH) -shared \

7. modify ``/home/lcao/uboot_unknown/src/arch/riscv/lib/crt0_riscv_efi.S, Line 140, remove the line
   lla a1, _DYNAMIC

8. modify ``/home/lcao/uboot_unknown/src/arch/riscv/config.mk line 31, remove -pie
   LDFLAGS_u-boot += --gc-sections -static -pie

9. modify ``/home/lcao/uboot_unknown/src/Makefile, line 1574, remove the line
   @tools/prelink-riscv $@ 0

10. cd /home/lcao/uboot_unknown/build/, run:
    make V=1 -C /home/lcao/uboot_unknown/src O= /home/lcao/uboot_unknown/build/

11. for error "make[2]: *** [arch/riscv/dts/ux00_zsbl.dtb] Error 1"
    copy ux00_zsbl.dtb /home/lcao/uboot_unknown/build/arch/riscv/dts/

I donot know which image can run in haps, just try to run the two methods.

• git show v2019.07 确认version

tag v2019.07
Tagger: Tom Rini <trini@konsulko.com>
Date:   Mon Jul 8 15:23:38 2019 -0400

Prepare v2019.07
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commit e5aee22e4be75e75a854ab64503fc80598bc2004 (HEAD, tag: v2019.07)
Author: Tom Rini <trini@konsulko.com>
Date:   Mon Jul 8 15:23:28 2019 -0400

    Prepare v2019.07

    Signed-off-by: Tom Rini <trini@konsulko.com>

diff --git a/Makefile b/Makefile
index f3857ab6a9..516260f46d 100644
--- a/Makefile
+++ b/Makefile
@@ -3,7 +3,7 @@
 VERSION = 2019
 PATCHLEVEL = 07
 SUBLEVEL =
-EXTRAVERSION = -rc4
+EXTRAVERSION =
 NAME =

 # *DOCUMENTATION*