A brand new XUP board is sitting on my desk...

... and even better it doesn't have the old jtag programmer onboard so it works with GRMON! So much better than the serial debug system I was using before. It programs about 10 times faster for a start.

Where to go from here: System C + Hardware/Software Codesign?

The GRLIB components and tools by being GPL'ed and available in VHDL form are a serious attraction for Hardware/Software Codesign.

It isn't quite clear yet how usable/possible this will be, but it would allow us access to real, selectable hardware examples. Quite a proposition.

MSc Projects offered...

I have offered the following MSc projects:

1. Remove the LEON3 core and substitute an OpenSPARC (possibly the single core, wishbone compatible variant).
2. Build a SATA controller
3. Explore the LEON3 GRLIB design space on ASIC and FPGA (i.e. how fast, how big, etc)
4. Build an AHB parallel port (high speed, of course. Maybe a bit of a ram buffer?)
5. Enable the Xilinx-XUP board's CF card to program the FPGA, install a boot loader and boot linux.

They are all different vairants of tricky, with 5 probably a real problem in disguise. I think it would be best for the boot loader to be part of the FPGA (i.e. a 1k ROM or similar) to boot off the CF card.

Linux successfully executed!

Here is the first console dump of my executing linux session (the image.dsu was borrowed from the theora project). I shall have to consider that a success. Now onto the stickier proposition of how to boot and execute from a flash card using the xilinx-xup board. I am thinking of using systemACE to package the kernel and bitfile, and then targetting a linux partition on the CF card. It all depends if system ACE can actually put things into RAM, but I believe it can look like FLASH to the FPGA so all should be alright.

M:\GRMON\win32>grmon-eval.exe -uart //./com8 -ibaud 250000 -u -nb

GRMON LEON debug monitor v1.1.29 (evaluation version)

Copyright (C) 2004,2005 Gaisler Research - all rights reserved.
For latest updates, go to http://www.gaisler.com/
Comments or bug-reports to support@gaisler.com

This evaluation version will expire on 15/10/2008
try open device //./com8
###opened device //./com8

GRLIB build version: 2950

initialising ..............
detected frequency: 80 MHz

Component Vendor
LEON3 SPARC V8 Processor Gaisler Research
AHB Debug UART Gaisler Research
AHB Debug JTAG TAP Gaisler Research
GR Ethernet MAC Gaisler Research
AHB ROM Gaisler Research
AHB/APB Bridge Gaisler Research
LEON3 Debug Support Unit Gaisler Research
DDR266 Controller Gaisler Research
Generic APB UART Gaisler Research
Multi-processor Interrupt Ctrl Gaisler Research
Modular Timer Unit Gaisler Research
Keyboard PS/2 interface Gaisler Research
Text-based VGA controller Gaisler Research
Keyboard PS/2 interface Gaisler Research

Use command 'info sys' to print a detailed report of attached cores

grlib> load M:\Downloads\image.dsu
section: .stage2 at 0x40000000, size 10180 bytes
section: .vmlinux at 0x40004000, size 1232960 bytes
section: .rdimage at 0x40148f94, size 1598828 bytes
total size: 2841968 bytes (88.3 kbit/s)
read 3706 symbols
entry point: 0x40000000
grlib> run
Booting Linux
Booting Linux...
PROMLIB: Sun Boot Prom Version 0 Revision 0
Linux version 2.6.21.1 (root@brazilip-tec) (gcc version 3.2.2) #16 Mon Aug 20 19
:32:42 BRT 2007
ARCH: LEON
Vendors Slaves
Ahb masters:
0( 1: 3| 0): VENDOR_GAISLER GAISLER_LEON3
1( 1: 7| 0): VENDOR_GAISLER GAISLER_AHBUART
2( 1: 1c| 0): VENDOR_GAISLER GAISLER_AHBJTAG
3( 1: 1d| 0): VENDOR_GAISLER GAISLER_ETHMAC
Ahb slaves:
0( 1: 1b| 0): VENDOR_GAISLER Unknown device 1b
+0: 0x0 (raw:0x3fff2)
1( 1: 6| 0): VENDOR_GAISLER GAISLER_APBMST
+0: 0x80000000 (raw:0x8000fff2)
2( 1: 4| 0): VENDOR_GAISLER GAISLER_LEON3DSU
+0: 0x90000000 (raw:0x9000f002)
3( 1: 25| 0): VENDOR_GAISLER Unknown device 25
+0: 0x40000000 (raw:0x4003c002)
+1: 0xfff00100 (raw:0x10fff3)
Apb slaves:
0( 1: c| 2): VENDOR_GAISLER GAISLER_APBUART
+ 0: 0x80000100 (raw:0x10fff1)
1( 1: d| 0): VENDOR_GAISLER GAISLER_IRQMP
+ 0: 0x80000200 (raw:0x20fff1)
2( 1: 11| 8): VENDOR_GAISLER GAISLER_GPTIMER
+ 0: 0x80000300 (raw:0x30fff1)
3( 1: 7| 0): VENDOR_GAISLER GAISLER_AHBUART
+ 0: 0x80000400 (raw:0x40fff1)
4( 1: 60| 5): VENDOR_GAISLER GAISLER_KBD
+ 0: 0x80000500 (raw:0x50fff1)
5( 1: 61| 0): VENDOR_GAISLER GAISLER_VGA
+ 0: 0x80000600 (raw:0x60fff1)
6( 1: 60| 4): VENDOR_GAISLER GAISLER_KBD
+ 0: 0x80000700 (raw:0x70fff1)
7( 1: 1d|12): VENDOR_GAISLER GAISLER_ETHMAC
+ 0: 0x80000b00 (raw:0xb0fff1)
TYPE: Leon2/3 System-on-a-Chip
Ethernet address: 0:0:0:0:0:0
CACHE: direct mapped cache, set size 8k
Boot time fixup v1.6. 4/Mar/98 Jakub Jelinek (jj@ultra.linux.cz). Patching kerne
l for srmmu[Leon2]/iommu
64MB HIGHMEM available.
node 2: /cpu00 (type:cpu) (props:.node device_type mid mmu-nctx clock-frequency
uart1_baud uart2_baud )
PROM: Built device tree from rootnode 1 with 918 bytes of memory.
DEBUG: psr.impl = 0xf fsr.vers = 0x7
Built 1 zonelists. Total pages: 64302
Kernel command line: console=ttyS0,38400 init=/sbin/init
PID hash table entries: 1024 (order: 10, 4096 bytes)
Todo: init master_l10_counter
Attaching grlib apbuart serial drivers (clk:80hz):
Console: colour dummy device 80x25
Dentry cache hash table entries: 32768 (order: 5, 131072 bytes)
Inode-cache hash table entries: 16384 (order: 4, 65536 bytes)
Memory: 252736k/262144k available (968k kernel code, 9244k reserved, 112k data,
116k init, 65536k highmem)
Mount-cache hash table entries: 512
checking if image is initramfs...it isn't (no cpio magic); looks like an initrd
Freeing initrd memory: 1561k freed
highmem bounce pool size: 64 pages
io scheduler noop registered
io scheduler cfq registered (default)
grlib apbuart: 1 serial driver(s) at [0x80000100(irq 2)]
grlib apbuart: system frequency: 80000 khz, baud rates: 38400 38400
ttyS0 at MMIO 0x80000100 (irq = 2) is a Leon
Loading theora ...
LEON THEORA driver by Andre Costa (2007) - andre.lnc@gmail.com
RAMDISK driver initialized: 16 RAM disks of 4096K size 1024 blocksize
loop: loaded (max 8 devices)
RAMDISK: Compressed image found at block 0
VFS: Mounted root (romfs filesystem) readonly.
Freeing unused kernel memory: 116k freed
init started: BusyBox v0.60.5 (2007.08.04-05:15+0000) multi-call binary
Shell invoked to run file: /etc/init.d/rcS
Command: #!/bin/sh
Command: mount
Please press Enter to activate this console.
Interrupt!
stopped at 0xf00140d0
grlib>

Just benchmarked my first LEON3

29.8 Dhrystones MIPS! This is an 80MHz LEON3 system with no FPU. Onwards, to linux!

Just connected to my first LEON3 SoC

... via the JTAG debugger but I am still unable to drive the DDR due to the lack of DCM modules in this particular Xilinx. I am now turning my attention to the XUP board from Digilent as they are quite common around here.

Hopefully I shall get further down that road towards the goal of booting linux on the system....

Trouble with the ML403...

Heh, should have realised it wouldn't be that easy...

Basically the ML403 differs from the ML401 & 2 by the fact that they both their Virtex-4's have 8 DCMs as opposed the 403's 4, and the LEON3 core with a DDR controller (necessary for the built in DDR memory) needs 5. It took a surprisingly long time for me to realise that's what the error message meant. Still today has been quite productive with a lot of lessons learnt.

Another lesson is that Xilinx ISE on windows will rebuild a Xilinx ISE on linux project, meaning the 20 minutes I took building and routing the first design came to nothing, as the windows machine proceeded to take about 60 minutes to perform the same task.