Created Wed, 05 Mar 2014 16:16:55 +0000 by pito
Wed, 05 Mar 2014 16:16:55 +0000
FYI: Running Retrobsd with 8MB ramdisk for swap and filesystem, supported by UECIDE as well :) http://www.rlx.sk/sk/storage-boards-memorystorage-boards-memory/2559-ramdisk-8mb-8mx8-8mbytes-with-8bit-parallel-access.html
Sat, 08 Mar 2014 17:01:08 +0000
How is the RAM connected to the Fub SD? Is the RAM needed to run RetroBSD?
I'm jealous, I wish I had time to play with RetroBSD.
Sun, 09 Mar 2014 18:57:41 +0000
The 8MB external ram is connected via pic32mx PMP bus - 8 data and 3 control signals (rd, wr, a0). The external ram is not required when occasional toying with retrobsd. For serious work you need it as the swap file is located on the external ram. Also the filesystem placed on the external ram speeds up the stuff significantly.
Sun, 09 Mar 2014 21:04:09 +0000
So I take that the a0 line is the memory clock. The link to the part your using for RAM says that it has 70ns PSRAM with a Xilinx CPLD. Is the a0 line part of the PMP bus of the PIC32?
Do you know the part numbers used? I take it that the CPLD is needed because the RAM doesn't interface nicely with a PIC32.
Sun, 09 Mar 2014 21:06:47 +0000
In your picture it looks like you have wired up four signals to the RAMDISK, MS, DATA, RD and WR. Not three as you mentioned in a previous message. Are all four used or do you need only three?
Sun, 09 Mar 2014 23:52:35 +0000
Zoom in. /MS is connected to ground (white with blue stripes).
Mon, 10 Mar 2014 01:45:30 +0000
;) I see...
Mon, 10 Mar 2014 17:34:49 +0000
The /MS is the module select - you may use several modules in parallel (not tested yet) so /MS is the select. With single module it shall be grounded. PMP consists of 8data, /rd. /wr, and addresses (A0 is the part of the address space), that ramdisk uses A0 as the /DATA signal. The driver does exist for retrobsd, sent to majenko already for committing it to the repo.
Sat, 20 Dec 2014 17:27:11 +0000
With 2x 8MB ramdisks, 2x /MS used as you may see out of the below pictures:
2.11 BSD Unix for PIC32, revision G87 build 3: Compiled 2014-05-04 by pito@ubuntu: /home/pito/RETROBSDGIT/retrobsd-1/sys/pic32/fubarino cpu: 795F512H 120 MHz, bus 120 MHz oscillator: HS crystal, PLL div 1:1 mult x15 console: tty1 (5,1) sd0: port SPI2, select pin G9 PP Schema: (sramc0:sa@2048,fs@6144 sramc1:fs@8192) Attempting partition of sramc0... %DBG-PPT: Device Name: sramc0: (7 chars) %DBG-PPT: Device found. %DBG-PPT: We now like this bit: sa@2048,fs@6144 sramc1:fs@8192) %DBG-PPT: Looking at: sa@2048,fs@6144 sramc1:fs@8192) %DBG-PPT: Added partition 0 type 184 size 4096 at offset 2 %DBG-PPT: Looking at: fs@6144 sramc1:fs@8192) %DBG-PPT: Added partition 1 type 183 size 12288 at offset 4098 PP Schema: (sramc0:sa@2048,fs@6144 sramc1:fs@8192) Attempting partition of sramc1... %DBG-PPT: Device Name: sramc1: (7 chars) %DBG-PPT: Device found. %DBG-PPT: We now like this bit: fs@8192) %DBG-PPT: Looking at: fs@8192) %DBG-PPT: Added partition 0 type 183 size 16384 at offset 2 sd0: type SDHC, size 3932160 kbytes, speed 20 Mbit/sec phys mem = 128 kbytes user mem = 96 kbytes root dev = rd0a (0,1) root size = 128000 kbytes swap dev = rd1a (1,1) swap size = 2048 kbytes /dev/rd0a: 611 files, 17023 used, 110476 free /dev/rd0c: 3 files, 2 used, 19918 free Getting disk size for /dev/rd1b Size: 6144 kbytes Inodes: 384 Getting disk size for /dev/rd2a Size: 8192 kbytes Inodes: 512 I2C dev found, adr(r/w): 51(A3/A2) RTC: 1412201943.08 Sat Dec 20 19:43:08 MET 2014 Starting daemons: update cron 2.11 BSD UNIX (pic32) (console) login: root Password: Welcome to RetroBSD! erase, kill ^U, intr ^C # date Sat Dec 20 19:44:05 MET 2014 # df -i Filesystem 1K-blocks Used Avail Capacity iused ifree %iused Mounted on /dev/rd0a 127499 16891 110608 13% 611 7389 7% / /dev/rd0c 19920 2 19918 0% 4 1260 0% /u /dev/rd1b 6119 2 6117 0% 3 381 0% /tmp0 /dev/rd2a 8159 2 8157 0% 3 509 0% /tmp1 #