openXC7
[yosys 0.18 : 0.36][openXC7 0.7.0] cannot place LUTRAM primitives
openXC7 0.7.0 update (more specifically yosys) introduces a build regression for litex-ddr-kc705 and litex-ddr-hpcstore-k420t demos due to unsupported inference of RAM128X1S/RAM256X1S (LUTRAM/Distributed RAM) primitives.
Info: Device utilisation:
Info: SLICE_LUTX: 12586/407600 3%
Info: SLICE_FFX: 6139/407600 1%
Info: CARRY4: 369/50950 0%
Info: PSEUDO_GND: 1/86505 0%
Info: PSEUDO_VCC: 1/86505 0%
Info: HARD0: 0/ 3660 0%
Info: RAMB18E1: 8/ 890 0%
Info: FIFO18E1: 0/ 445 0%
Info: RAMBFIFO36E1: 0/ 445 0%
Info: RAMB36E1: 11/ 445 2%
Info: DSP48E1: 4/ 840 0%
Info: PAD: 131/ 1460 8%
Info: IOB33M_OUTBUF: 0/ 168 0%
Info: IOB33S_OUTBUF: 0/ 168 0%
Info: IOB33_OUTBUF: 5/ 350 1%
Info: IOB33M_INBUF_EN: 0/ 168 0%
Info: IOB33S_INBUF_EN: 0/ 168 0%
Info: IOB33_INBUF_EN: 3/ 350 0%
Info: IOB33M_TERM_OVERRIDE: 0/ 168 0%
Info: IOB33S_TERM_OVERRIDE: 0/ 168 0%
Info: IOB33_TERM_OVERRIDE: 0/ 350 0%
Info: PULL_OR_KEEP1: 0/ 980 0%
Info: IDELAYE2: 64/ 500 12%
Info: OLOGICE3_TFF: 0/ 350 0%
Info: OLOGICE3_OUTFF: 0/ 350 0%
Info: OLOGICE3_MISR: 0/ 350 0%
Info: OSERDESE2: 107/ 500 21%
Info: ILOGICE3_IFF: 0/ 350 0%
Info: ILOGICE3_ZHOLD_DELAY: 0/ 350 0%
Info: ISERDESE2: 64/ 500 12%
Info: BUFIO: 0/ 40 0%
Info: IDELAYCTRL: 3/ 10 30%
Info: BUFGCTRL: 4/ 32 12%
Info: BSCAN: 0/ 4 0%
Info: BUFG: 0/ 32 0%
Info: DCIRESET: 0/ 1 0%
Info: DNA_PORT: 0/ 1 0%
Info: EFUSE_USR: 0/ 1 0%
Info: FRAME_ECC: 0/ 1 0%
Info: ICAP: 0/ 2 0%
Info: INVERTER: 9/ 240 3%
Info: IOB18M_OUTBUF_DCIEN: 9/ 72 12%
Info: IOB18_INBUF_DCIEN: 65/ 150 43%
Info: IOB18_OUTBUF_DCIEN: 102/ 150 68%
Info: MMCME2_ADV: 0/ 10 0%
Info: ODELAYE2: 107/ 150 71%
Info: OLOGICE2_TFF: 0/ 500 0%
Info: OLOGICE2_OUTFF: 0/ 500 0%
Info: PLLE2_ADV: 1/ 10 10%
Info: SELMUX2_1: 4/154550 0%
Info: STARTUP: 0/ 1 0%
Info: USR_ACCESS: 0/ 1 0%
Info: BUFHCE: 0/ 168 0%
Info: BUFFER: 0/ 480 0%
Info: ILOGICE2_IFF: 0/ 500 0%
Info: OLOGICE2_MISR: 0/ 500 0%
Info: IOB18_TERM_OVERRIDE: 0/ 150 0%
Info: IOB18S_INBUF_DCIEN: 0/ 72 0%
Info: IOB18S_OUTBUF_DCIEN: 9/ 72 12%
Info: IOB18S_TERM_OVERRIDE: 0/ 72 0%
Info: IOB18M_INBUF_DCIEN: 9/ 72 12%
Info: IOB18M_TERM_OVERRIDE: 0/ 72 0%
Info: IDELAYE2_FINEDELAY: 0/ 150 0%
Info: Placed 687 cells based on constraints.
ERROR: Unable to place cell 'data_mem_grain0.0.0.genblk1.genblk1[0].genblk1.slice', no Bels remaining of type 'RAM128X1S'
0 warnings, 1 error
make: *** [../openXC7.mk:40: xilinx_kc705.fasm] Error 255
Looks like the openXC7 0.7.0 release includes an update to yosys 0.36 (from 0.17), which introduces memory_libmap pass (from 0.18 release). Reverting https://github.com/YosysHQ/yosys/commit/3b2f95953c8b8343f2696c5f47bfb2864417a8b1 stops yosys from inferring unsupported LUTRAM primitives.
Oh, so that issue only shows up for those Kintex parts. Do smaller kintex parts work? I really need to set up a CI. The obvious workaround is using yosys 0.17.
Oh, so that issue only shows up for those Kintex parts. Do smaller kintex parts work?
Yes, only for kc705 and hpcstore/sitlinv-k420t. Other parts work including qmtech-xc7k325t.
Comparing xilinx_kc705.py and qmtech-xc7k325t.py litex targets, I found that the main difference comes down to the use of PHYPadsReducer. After updating xilinx_kc705 to use [0,1] modules (and no larger subset), yosys no longer infers unsupported LUTRAM primitives.
# DDR3 SDRAM -------------------------------------------------------------------------------
if not self.integrated_main_ram_size:
from litedram.common import PHYPadsReducer
- self.ddrphy = s7ddrphy.K7DDRPHY(platform.request("ddram"),
+ self.ddrphy = s7ddrphy.K7DDRPHY(
+ #PHYPadsReducer(platform.request("ddram"), [0, 1, 2, 3, 4, 5, 6, 7]),
+ PHYPadsReducer(platform.request("ddram"), [0, 1]),
memtype = "DDR3",
nphases = 4,
sys_clk_freq = sys_clk_freq)
self.add_sdram("sdram",
phy = self.ddrphy,
module = MT8JTF12864(sys_clk_freq, "1:4"),
l2_cache_size = kwargs.get("l2_size", 8192)
The obvious workaround is using yosys 0.17.
Yes, this much is clear. However, I am interested in getting more primitives supported. Do you mind opening issues tab for prjxray or prjxray-db forks for tracking unsupported primitives?