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enjoy-digital / litedram

Small footprint and configurable DRAM core
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Add HalfRate GENSDRPHY #206

Closed jedrzejboczar closed 3 years ago

jedrzejboczar commented 4 years ago

Corresponding issue: https://github.com/enjoy-digital/litedram/issues/183

This adds a wrapper over GENSDRPHY and option to use it on ULX3S (with https://github.com/enjoy-digital/litex/pull/563 PR).

But this does not yet work correctly, I've been trying to find an error, but with no success. @enjoy-digital could you please take a look if I'm missing something?

jedrzejboczar commented 3 years ago

I fixed the main problems in the implementation and tested it on minispartan6 board with frequency 80MHz:160MHz getting correct results (./minispartan6.py --build --load --csr-csv csr.csv --uart-name crossover --cpu-variant lite --integrated-sram-size 4096 --sdram-sys2x + uartbone + Platform(device="xc6slx9") + https://github.com/litex-hub/litex-boards/pull/91):

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

 (c) Copyright 2012-2020 Enjoy-Digital
 (c) Copyright 2007-2015 M-Labs

 BIOS built on Jul 14 2020 11:35:23
 BIOS CRC passed (f290e714)

 Migen git sha1: b1b2b29
 LiteX git sha1: 6671eb62

--=============== SoC ==================--
CPU:       VexRiscv @ 80MHz
BUS:       WISHBONE 32-bit @ 4GiB
CSR:       8-bit data
ROM:       32KiB
SRAM:      4KiB
L2:        8KiB
MAIN-RAM:  32768KiB

--========== Initialization ============--
Initializing DRAM @0x40000000...
SDRAM now under software control
SDRAM now under hardware control
Memtest at 0x40000000...
[########################################]
[########################################]
Memtest OK
Memspeed at 0x40000000...
Writes: 146 Mbps
Reads:  169 Mbps

--============== Boot ==================--
Booting from serial...
Press Q or ESC to abort boot completely.
sL5DdSMmkekro
Timeout
No boot medium found

--============= Console ================--

litex> ident
Ident: LiteX SoC on MiniSpartan6 2020-07-14 11:35:22
litex>
enjoy-digital commented 3 years ago

Thanks! Merged.

enjoy-digital commented 3 years ago

@jedrzejboczar: just for info, i've been able to reproduce your results and also boot Linux with it on the Minispartan6 (with a boot speed up), thanks.