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ice40: Add debugs to isBelLocationValid for SB_IO

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When there is a constraint conflict while placing IOs, the user gets an
error message such as

ERROR: Bel 'X0/Y27/io1' of type 'SB_IO' is not valid for cell 'my_pin' of type 'SB_IO'

While this identifies the problematic cell, it does not explain why
there is a problem. Add some verbose messages to allow users to
determine where the problem is. This can result in something like

Info: Net '$PACKER_VCC_NET' for cell 'my_pin' conflicts with net 'ce' for 'ce_pin'

which provides something actionable.

Signed-off-by: Sean Anderson <seanga2@gmail.com>
This commit is contained in:
Sean Anderson 2022-10-30 19:21:41 -04:00 committed by gatecat
parent 603b60da8d
commit df99b4ff6c
1 changed files with 22 additions and 4 deletions
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26
ice40/arch_place.cc
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@ -124,6 +124,8 @@ bool Arch::isBelLocationValid(BelId bel, bool explain_invalid) const
return true;
// Conflict
if (explain_invalid)
log_nonfatal_error("Cell '%s' conflicts with PLL cell '%s'\n", nameOf(cell), nameOf(pll_cell));
return false;
}
}
@ -135,18 +137,29 @@ bool Arch::isBelLocationValid(BelId bel, bool explain_invalid) const
// Check LVDS pairing
if (cell->ioInfo.lvds) {
// Check correct z and complement location is free
if (ioLoc.z != 0)
if (ioLoc.z != 0) {
if (explain_invalid)
log_nonfatal_error("Bel '%s' can't be used for LVDS\n", getCtx()->nameOfBel(bel));
return false;
}
BelId compBel = getBelByLocation(compLoc);
CellInfo *compCell = getBoundBelCell(compBel);
if (compCell)
if (compCell) {
if (explain_invalid)
log_nonfatal_error("Cell '%s' LVDS complement occupied by cell '%s'\n", nameOf(cell),
nameOf(compCell));
return false;
}
} else {
// Check LVDS IO is not placed at complement location
BelId compBel = getBelByLocation(compLoc);
const CellInfo *compCell = getBoundBelCell(compBel);
if (compCell && compCell->ioInfo.lvds)
if (compCell && compCell->ioInfo.lvds) {
if (explain_invalid)
log_nonfatal_error("Cell '%s' can't occupy LVDS complement of cell '%s'\n", nameOf(cell),
nameOf(compCell));
return false;
}
// Check for conflicts on shared nets
// - CLOCK_ENABLE
@ -168,8 +181,13 @@ bool Arch::isBelLocationValid(BelId bel, bool explain_invalid) const
};
for (int i = 0; i < 6; i++)
if (use[i] && (nets[i] != nets[i ^ 1]) && (use[i ^ 1] || (nets[i ^ 1] != nullptr)))
if (use[i] && (nets[i] != nets[i ^ 1]) && (use[i ^ 1] || (nets[i ^ 1] != nullptr))) {
if (explain_invalid)
log_nonfatal_error("Net '%s' for cell '%s' conflicts with net '%s' for '%s'\n",
nameOf(nets[i]), nameOf(cell), nameOf(nets[i ^ 1]),
nameOf(compCell));
return false;
}
}
}