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@@ -1,2 +1,50 @@
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# tools
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+## spl_tool
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+
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+Use to create `u-boot-spl.bin.normal.out`
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+
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+Input:
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+
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+```
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+{U-BOOT_PATH}/spl/u-boot-spl.bin
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+```
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+
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+Output:
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+
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+```
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+u-boot-spl.bin.normal.out
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+```
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+
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+For example:
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+
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+```
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+./create_sbl {U-BOOT_PATH}/spl/u-boot-spl.bin 0x01010101
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+```
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+
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+
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+
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+## visionfive2-uboot-fit-image.its
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+
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+Use to create `visionfive2_fw_payload.img`
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+
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+Input:
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+
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+```
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+{U-BOOT_PATH}/tools/mkimage
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+{OPENSBI_PATH}/build/platform/generic/firmware/fw_payload.bin
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+visionfive2-uboot-fit-image.its
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+```
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+
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+Output:
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+
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+```
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+visionfive2_fw_payload.img
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+```
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+
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+For example:
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+
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+```
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+{U-BOOT_PATH}/tools/mkimage -f visionfive2-uboot-fit-image.its -A riscv -O u-boot -T firmware visionfive2_fw_payload.img
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+```
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+
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