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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
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top/x400/regmap/versioning_regs_regmap_utils.vh
+2 -2
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@@ -84,8 +84,8 @@
localparam FPGA_OLDEST_COMPATIBLE_VERSION_BUILD = 'h0; // FPGA_VERSION:FPGA_OLDEST_COMPATIBLE_VERSION_BUILD
localparam FPGA_CURRENT_VERSION_MAJOR = 'h7; // FPGA_VERSION:FPGA_CURRENT_VERSION_MAJOR
localparam FPGA_OLDEST_COMPATIBLE_VERSION_MAJOR = 'h7; // FPGA_VERSION:FPGA_OLDEST_COMPATIBLE_VERSION_MAJOR
localparam FPGA_CURRENT_VERSION_MINOR = 'h9; // FPGA_VERSION:FPGA_CURRENT_VERSION_MINOR
localparam FPGA_VERSION_LAST_MODIFIED_TIME = 'h22062212; // FPGA_VERSION:FPGA_VERSION_LAST_MODIFIED_TIME
localparam FPGA_CURRENT_VERSION_MINOR = 'hA; // FPGA_VERSION:FPGA_CURRENT_VERSION_MINOR
localparam FPGA_VERSION_LAST_MODIFIED_TIME = 'h22121609; // FPGA_VERSION:FPGA_VERSION_LAST_MODIFIED_TIME
// Enumerated type RF_CORE_100M_VERSION
localparam RF_CORE_100M_VERSION_SIZE = 7;