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nexus: Support for MULTIBOOT 

Signed-off-by: gatecat <gatecat@ds0.me>
This commit is contained in:
gatecat 2026-01-22 17:04:09 +01:00
parent 1c099cfca1
commit ee159126e1
4 changed files with 39 additions and 1 deletions
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5
nexus/constids.inc
View File

@ -548,6 +548,11 @@ X(SELFORCE)
X(DCSOUT)
X(DCSMODE)
X(MULTIBOOT)
X(CONFIG_MULTIBOOT_CORE)
X(CIBAUTOREBOOT)
X(MSPIADDR)
X(BEL_TYPE)
X(BEL_Z)
X(CEOUTMUX)

12
nexus/fasm.cc
View File

@ -530,6 +530,16 @@ struct NexusFasmWriter
write_cell_muxes(cell);
pop(2);
}
// Write config for an CONFIG_MULTIBOOT_CORE cell
void write_multiboot(const CellInfo *cell)
{
BelId bel = cell->bel;
push_bel(bel);
write_enum(cell, "SOURCESEL", "DIS");
write_int_vector(stringf("MSPIADDR[31:0]"),
ctx->parse_lattice_param_from_cell(cell, id_MSPIADDR, 32, 0).intval, 32);
pop();
}
// Write config for DCC
void write_dcc(const CellInfo *cell)
{
@ -1095,6 +1105,8 @@ struct NexusFasmWriter
write_dcc(ci);
else if (ci->type == id_DCS)
write_dcs(ci);
else if (ci->type == id_CONFIG_MULTIBOOT_CORE)
write_multiboot(ci);
blank();
}
// Handle DCC route-throughs

16
nexus/pack.cc
View File

@ -1081,14 +1081,30 @@ struct NexusPacker
{id_PDPSC16K, id_PDPSC16K_MODE}, {id_SP16K, id_SP16K_MODE}, {id_FIFO16K, id_FIFO16K_MODE},
{id_SP512K, id_SP512K_MODE}, {id_DPSC512K, id_DPSC512K_MODE}, {id_PDPSC512K, id_PDPSC512K_MODE},
{id_PLL, id_PLL_CORE}, {id_DPHY, id_DPHY_CORE},
{id_MULTIBOOT, id_CONFIG_MULTIBOOT_CORE},
};
// extra prefix needed for this primitive for some reason
for (auto &cell : ctx->cells) {
CellInfo *ci = cell.second.get();
if (ci->type != id_MULTIBOOT)
continue;
std::vector<IdString> pin_names;
for (const auto &port : ci->ports) {
pin_names.push_back(port.first);
}
for (auto pin_name : pin_names) {
ci->renamePort(pin_name, ctx->idf("CIB%s", pin_name.c_str(ctx)));
}
}
for (auto &cell : ctx->cells) {
CellInfo *ci = cell.second.get();
if (!prim_map.count(ci->type))
continue;
prim_to_core(ci, prim_map.at(ci->type));
}
}
void add_bus_xform(XFormRule &rule, const std::string &o, const std::string &n, int width, int old_offset = 0,

7
nexus/pins.cc
View File

@ -240,7 +240,12 @@ static const dict<IdString, Arch::CellPinsData> base_cell_pin_data = {
{id_TXDATA0, PINSTYLE_CIB},
{id_TXDATA1, PINSTYLE_CIB},
{id_TSDATA0, PINSTYLE_CIB},
}}};
}},
{id_CONFIG_MULTIBOOT_CORE,
{
{{}, PINSTYLE_CIB},
}},
};
} // namespace
void Arch::init_cell_pin_data() { cell_pins_db = base_cell_pin_data; }