Rocket Chip boot issue with boot.bin on AC701

[harshitk26]

Hi everyone
While everything is working fine with vexriscv architecture, we are able to boot bare-metal, linux and RTOS without any issue (with some few changes in dts and core py files and DDR3 issues) same we are not getting any out after liftoff on RocketChip architecture.

Is there any open issue with booting with Rocket Chip ?

Generation of bit stream.
litex-boards/litex_boards/targets/xilinx_ac701.py --build --cpu-type rocket --cpu-variant linux4 --sys-clk-freq 50e6 --with-ethernet
--> Bitstream generated successfully
--> BIOS running on Hardware successfully. All test cases passed including SDRAM.
Generation of demo.bin (baremetal)
litex_bare_metal_demo --build-path=./

Loading demo.bin via lxterm via serial port to AC701 hardware
sudo lxterm /dev/ttyUSB1 --kernel demo.bin --kernel-adr 0x80000000

        __   _ __      _  __
       / /  (_) /____ | |/_/
      / /__/ / __/ -_)>  <
     /____/_/\__/\__/_/|_|
   Build your hardware, easily!

 (c) Copyright 2012-2021 Enjoy-Digital
 (c) Copyright 2007-2015 M-Labs

 BIOS built on Dec 28 2021 10:36:56
 BIOS CRC passed (fec48173)

 Migen git sha1: 9a0be7a
 LiteX git sha1: 9482cbc8

--=============== SoC ==================--
CPU:		RocketRV64[imac] @ 50MHz
BUS:		WISHBONE 32-bit @ 4GiB
CSR:		32-bit data
ROM:		128KiB
SRAM:		8KiB
SDRAM:		1048576KiB 32-bit @ 400MT/s (CL-7 CWL-5)

--========== Initialization ============--
Ethernet init...
Initializing SDRAM @0x80000000...
Switching SDRAM to software control.
Write latency calibration:
m0:0 m1:0 m2:0 m3:0 
Read leveling:
  m0, b00: |00000000000000000000000000000000| delays: -
  m0, b01: |11111111111111000000000000000000| delays: 07+-07
  m0, b02: |00000000000000000011111111111111| delays: 25+-07
  m0, b03: |00000000000000000000000000000000| delays: -
  m0, b04: |00000000000000000000000000000000| delays: -
  m0, b05: |00000000000000000000000000000000| delays: -
  m0, b06: |00000000000000000000000000000000| delays: -
  m0, b07: |00000000000000000000000000000000| delays: -
  best: m0, b01 delays: 07+-07
  m1, b00: |00000000000000000000000000000000| delays: -
  m1, b01: |11111111111110000000000000000000| delays: 06+-06
  m1, b02: |00000000000000000011111111111111| delays: 25+-07
  m1, b03: |00000000000000000000000000000000| delays: -
  m1, b04: |00000000000000000000000000000000| delays: -
  m1, b05: |00000000000000000000000000000000| delays: -
  m1, b06: |00000000000000000000000000000000| delays: -
  m1, b07: |00000000000000000000000000000000| delays: -
  best: m1, b02 delays: 25+-07
  m2, b00: |00000000000000000000000000000000| delays: -
  m2, b01: |11111111111100000000000000000000| delays: 06+-06
  m2, b02: |00000000000000001111111111111111| delays: 24+-08
  m2, b03: |00000000000000000000000000000000| delays: -
  m2, b04: |00000000000000000000000000000000| delays: -
  m2, b05: |00000000000000000000000000000000| delays: -
  m2, b06: |00000000000000000000000000000000| delays: -
  m2, b07: |00000000000000000000000000000000| delays: -
  best: m2, b02 delays: 24+-08
  m3, b00: |00000000000000000000000000000000| delays: -
  m3, b01: |11111111111111000000000000000000| delays: 06+-06
  m3, b02: |00000000000000000011111111111111| delays: 25+-07
  m3, b03: |00000000000000000000000000000000| delays: -
  m3, b04: |00000000000000000000000000000000| delays: -
  m3, b05: |00000000000000000000000000000000| delays: -
  m3, b06: |00000000000000000000000000000000| delays: -
  m3, b07: |00000000000000000000000000000000| delays: -
  best: m3, b02 delays: 24+-07
Switching SDRAM to hardware control.
Memtest at 0x80000000 (2.0MiB)...
  Write: 0x80000000-0x80200000 2.0MiB     
   Read: 0x80000000-0x80200000 2.0MiB     
Memtest OK
Memspeed at 0x80000000 (Sequential, 2.0MiB)...
  Write speed: 10.8MiB/s
   Read speed: 15.5MiB/s

--============== Boot ==================--
Booting from serial...
Press Q or ESC to abort boot completely.
sL5DdSMmkekro
[LXTERM] Received firmware download request from the device.
[LXTERM] Uploading demo.bin to 0x80000000 (5836 bytes)...
[LXTERM] Upload calibration... (inter-frame: 10.00us, length: 64)
[LXTERM] Upload complete (9.9KB/s).
[LXTERM] Booting the device.
[LXTERM] Done.
Executing booted program at 0x80000000

--============= Liftoff! ===============--

After Liftoff, unable to get any output from demo.bin, We are stuck here :(

[troibe]

Removing -flto here seems to be the intermediate fix for the demo to work on Rocket.

[troibe]

While this does work it also breaks some other stuff.
The real issue is that the version of the toolchain that you and I were using is broken.
Update your toolchain to a more recent on like this and it should work again.

[enjoy-digital]

Thanks @developandplay, I think we can now close this. @harshitk26: Please re-open if you still have troubles.