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firmware: Add common FW_FDT_PATH compile-time option

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Currently, only FW_PAYLOAD has mechanism to embed external
FDT using FW_PAYLOAD_FDT_PATH compile-time option.

This patch adds a common FW_FDT_PATH compile-time option to
embed external FDT for all OpenSBI firmwares (i.e FW_JUMP,
FW_PAYLOAD, and FW_DYNAMIC).

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
This commit is contained in:
Anup Patel 2020-10-14 16:03:35 +05:30 • committed by Anup Patel
parent af4b50f896
commit 6ca096977d
4 changed files with 37 additions and 4 deletions
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14
docs/firmware/fw.md
View file

@ -51,11 +51,17 @@ case, a *FW_PAYLOAD* firmware allows embedding a flattened device tree in the
Firmware Configuration and Compilation
--------------------------------------
All firmware types mandate the definition of the following compile time
configuration parameter.
All firmware types support the following common compile time configuration
parameters:
* **FW_TEXT_ADDR** - Defines the address at which the previous booting stage
loads OpenSBI firmware.
* **FW_TEXT_ADDR** - Defines the execution address of the OpenSBI firmware.
This configuration parameter is mandatory.
* **FW_FDT_PATH** - Path to an external flattened device tree binary file to
be embedded in the *.rodata* section of the final firmware. If this option
is not provided then the firmware will expect the FDT to be passed as an
argument by the prior booting stage.
* **FW_FDT_PADDING** - Optional zero bytes padding to the embedded flattened
device tree binary file specified by **FW_FDT_PATH** option.
Additionally, each firmware type as a set of type specific configuration
parameters. Detailed information for each firmware type can be found in the

4
firmware/external_deps.mk
View file

@ -7,5 +7,9 @@
# Anup Patel <anup.patel@wdc.com>
#
$(platform_build_dir)/firmware/fw_dynamic.o: $(FW_FDT_PATH)
$(platform_build_dir)/firmware/fw_jump.o: $(FW_FDT_PATH)
$(platform_build_dir)/firmware/fw_payload.o: $(FW_FDT_PATH)
$(platform_build_dir)/firmware/fw_payload.o: $(FW_PAYLOAD_PATH_FINAL)
$(platform_build_dir)/firmware/fw_payload.o: $(FW_PAYLOAD_FDT_PATH)

16
firmware/fw_base.S
View file

@ -182,6 +182,11 @@ _bss_zero:
call fw_save_info
MOV_5R a0, s0, a1, s1, a2, s2, a3, s3, a4, s4
#ifdef FW_FDT_PATH
/* Override previous arg1 */
la a1, fw_fdt_bin
#endif
/* Override previous arg1 */
MOV_3R s0, a0, s1, a1, s2, a2
call fw_prev_arg1
@ -668,3 +673,14 @@ _reset_regs:
csrw CSR_MSCRATCH, 0
ret
#ifdef FW_FDT_PATH
.section .rodata
.align 4
.globl fw_fdt_bin
fw_fdt_bin:
.incbin FW_FDT_PATH
#ifdef FW_FDT_PADDING
.fill FW_FDT_PADDING, 1, 0
#endif
#endif

7
firmware/objects.mk
View file

@ -17,6 +17,13 @@ ifdef FW_TEXT_START
firmware-genflags-y += -DFW_TEXT_START=$(FW_TEXT_START)
endif
ifdef FW_FDT_PATH
firmware-genflags-y += -DFW_FDT_PATH=\"$(FW_FDT_PATH)\"
ifdef FW_FDT_PADDING
firmware-genflags-y += -DFW_FDT_PADDING=$(FW_FDT_PADDING)
endif
endif
firmware-bins-$(FW_DYNAMIC) += fw_dynamic.bin
firmware-bins-$(FW_JUMP) += fw_jump.bin