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fpga: Add BUILD_SEED variable

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Adds a BUILD_SEED make variable that can be set to a 32-bit integer,
and adds an FPGA read-only register initialized by this variable.
Changing this variable will randomly affect the FPGA build results.
This can be useful when your build fails timing by a small amount,
allowing you to build again and get different results with the same
code.

For example, you could run the following to produce an FPGA build with
different timing results from the default build:

make X310_XG BUILD_SEED=123


Original-commit: 3a3a03486f9221c2e59fa6d0826c23d17730956d
This commit is contained in:
Wade Fife
2023-02-07 23:04:12 -06:00
parent 2c0fea5d1e
commit ab63d78a6c
15 changed files with 221 additions and 61 deletions
Download Patch File Download Diff File Expand all files Collapse all files
top/n3xx/Makefile
+16 -12
View File
@@ -23,15 +23,18 @@
# Uncomment this line to add four example Aurora loopback lanes on the QSFP NPIO bus.
# OPTIONS += QSFP_LANES=4
# Initialize a build seed. This can be changed to randomly affect build results.
BUILD_SEED ?= 0
# Additional definitions specific to the various targets:
WX_DEFS=SFP0_WR=1 SFP1_10GBE=1 BUILD_WR=1 BUILD_10G=1 $(OPTIONS)
HG_DEFS=SFP0_1GBE=1 SFP1_10GBE=1 BUILD_1G=1 BUILD_10G=1 $(OPTIONS)
XG_DEFS=SFP0_10GBE=1 SFP1_10GBE=1 BUILD_10G=1 $(OPTIONS)
HA_DEFS=SFP0_1GBE=1 SFP1_AURORA=1 BUILD_1G=1 BUILD_AURORA=1 $(OPTIONS)
XA_DEFS=SFP0_10GBE=1 SFP1_AURORA=1 BUILD_10G=1 BUILD_AURORA=1 $(OPTIONS)
AA_DEFS=SFP0_AURORA=1 SFP1_AURORA=1 BUILD_AURORA=1 $(OPTIONS)
XQ_DEFS=SFP0_WR=1 QSFP_10GBE=1 BUILD_WR=1 BUILD_10G=1 QSFP_LANES=2 $(OPTIONS)
AQ_DEFS=SFP0_10GBE=1 SFP1_10GBE=1 QSFP_AURORA=1 BUILD_10G=1 BUILD_AURORA=1 QSFP_LANES=4 $(OPTIONS)
WX_DEFS=SFP0_WR=1 SFP1_10GBE=1 BUILD_WR=1 BUILD_10G=1 $(OPTIONS) BUILD_SEED=$(BUILD_SEED)
HG_DEFS=SFP0_1GBE=1 SFP1_10GBE=1 BUILD_1G=1 BUILD_10G=1 $(OPTIONS) BUILD_SEED=$(BUILD_SEED)
XG_DEFS=SFP0_10GBE=1 SFP1_10GBE=1 BUILD_10G=1 $(OPTIONS) BUILD_SEED=$(BUILD_SEED)
HA_DEFS=SFP0_1GBE=1 SFP1_AURORA=1 BUILD_1G=1 BUILD_AURORA=1 $(OPTIONS) BUILD_SEED=$(BUILD_SEED)
XA_DEFS=SFP0_10GBE=1 SFP1_AURORA=1 BUILD_10G=1 BUILD_AURORA=1 $(OPTIONS) BUILD_SEED=$(BUILD_SEED)
AA_DEFS=SFP0_AURORA=1 SFP1_AURORA=1 BUILD_AURORA=1 $(OPTIONS) BUILD_SEED=$(BUILD_SEED)
XQ_DEFS=SFP0_WR=1 QSFP_10GBE=1 BUILD_WR=1 BUILD_10G=1 QSFP_LANES=2 $(OPTIONS) BUILD_SEED=$(BUILD_SEED)
AQ_DEFS=SFP0_10GBE=1 SFP1_10GBE=1 QSFP_AURORA=1 BUILD_10G=1 BUILD_AURORA=1 QSFP_LANES=4 $(OPTIONS) BUILD_SEED=$(BUILD_SEED)
# Defaults specific to the various targets:
N300_DEFAULTS:=DEFAULT_RFNOC_IMAGE_CORE_FILE=$(abspath n300_rfnoc_image_core.v) DEFAULT_EDGE_FILE=$(abspath n300_static_router.hex)
@@ -200,9 +203,10 @@ help: ##Show this help message.
##
##Supported Options
##-----------------
##GUI=1 Launch the build in the Vivado GUI.
##CHECK=1 Launch the syntax checker instead of building a bitfile.
##SYNTH=1 Launch the build but stop after synthesis.
##TOP=<module> Specify a top module for syntax checking. (Optional. Default is the bitfile top)
##GUI=1 Launch the build in the Vivado GUI.
##CHECK=1 Launch the syntax checker instead of building a bitfile.
##SYNTH=1 Launch the build but stop after synthesis.
##BUILD_SEED=<N> Build seed to used to affect build results. (Default is 0)
##TOP=<module> Specify a top module for syntax checking. (Default is the bitfile top)
.PHONY: all clean cleanall help
top/n3xx/n3xx_core.v
+12 -3
View File
@@ -211,7 +211,7 @@ module n3xx_core #(
/////////////////////////////////////////////////////////////////////////////////
localparam [15:0] COMPAT_MAJOR = 16'd8;
localparam [15:0] COMPAT_MINOR = 16'd1;
localparam [15:0] COMPAT_MINOR = 16'd2;
/////////////////////////////////////////////////////////////////////////////////
/////////////////////////////////////////////////////////////////////////////////
@@ -244,6 +244,7 @@ module n3xx_core #(
localparam REG_FP_GPIO_MASTER = REG_BASE_MISC + 14'h30;
localparam REG_FP_GPIO_RADIO_SRC = REG_BASE_MISC + 14'h34;
localparam REG_NUM_TIMEKEEPERS = REG_BASE_MISC + 14'h48;
localparam REG_BUILD_SEED = REG_BASE_MISC + 14'h4C;
localparam NUM_TIMEKEEPERS = 1;
@@ -543,11 +544,12 @@ module n3xx_core #(
REG_DATESTAMP:
cp_glob_resp_data <= build_datestamp;
REG_GIT_HASH:
REG_GIT_HASH: begin
`ifndef GIT_HASH
`define GIT_HASH 32'h0BADC0DE
`define GIT_HASH 32'h0BADC0DE
`endif
cp_glob_resp_data <= `GIT_HASH;
end
REG_FP_GPIO_MASTER:
cp_glob_resp_data <= fp_gpio_master_reg;
@@ -588,6 +590,13 @@ module n3xx_core #(
REG_NUM_TIMEKEEPERS:
cp_glob_resp_data <= NUM_TIMEKEEPERS;
REG_BUILD_SEED: begin
`ifndef BUILD_SEED
`define BUILD_SEED 32'b0
`endif
cp_glob_resp_data <= `BUILD_SEED;
end
default: begin
// Don't acknowledge if the address doesn't match
cp_glob_resp_ack <= 1'b0;