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by Bakul Shah
Sun Jul 21, 2019 12:26 am
Forum: Off topic discussion
Topic: Something I'd like to see. ( USB to SATA bridge )
Replies: 34
Views: 1162

Re: Something I'd like to see.

The problem with doing a line expansion on the single PCIe is that you're back at the same problem the Pis prior to the Pi4B had. You have a single, limited capacity line into the SoC. No matter how much stuff is at the other end, it's all got to get down to that single line at some point. It comes...
by Bakul Shah
Sat Jul 20, 2019 9:10 pm
Forum: Off topic discussion
Topic: Something I'd like to see. ( USB to SATA bridge )
Replies: 34
Views: 1162

Re: Something I'd like to see.

Some of the folks in the CM forum were practically drooling over the prospect getting access to a PCIe lane. Unfortunately, some of them seemed to think that there were multiple PCIe lanes (if only...). There are PCIe expansion switch devices: 1 upstream, 2 or more downstream ports. This can be put...
by Bakul Shah
Sat Jul 20, 2019 12:32 pm
Forum: Off topic discussion
Topic: Something I'd like to see. ( USB to SATA bridge )
Replies: 34
Views: 1162

Re: Something I'd like to see.

Therefore, I think that once the RPT launches a CM4, I would dearly love to see them build a *proper* CM4 SATA Adapter board. It should have at least 2 USB ports (USB 2.0 would be fine), Ethernet jack, and one HDMI output would be sufficient. It might be interesting to use the single PCIe lane from...
by Bakul Shah
Wed Jul 10, 2019 9:54 pm
Forum: Bare metal, Assembly language
Topic: JTAG with the FT232H
Replies: 1
Views: 426

Re: JTAG with the FT232H

Perhaps this page may help you? BARE METAL RASPBERRY PI 3B+: JTAG
by Bakul Shah
Sat Jun 29, 2019 10:35 am
Forum: Advanced users
Topic: Can the pi 4 boot off exfat?
Replies: 18
Views: 839

Re: Can the pi 4 boot off exfat?

IIRC the current bootloader doesn't support long filenames when accessing the boot files due to the MS patent on those, hence the elf, dat, txt, and kernel img files all conform to the 8.3 filename convention. If you are talking about US Patent 5,579,517 I believe it has expired. See https://patent...
by Bakul Shah
Sat Jun 29, 2019 8:29 am
Forum: Advanced users
Topic: Can the pi 4 boot off exfat?
Replies: 18
Views: 839

Re: Can the pi 4 boot off exfat?

IIRC the current bootloader doesn't support long filenames when accessing the boot files due to the MS patent on those, hence the elf, dat, txt, and kernel img files all conform to the 8.3 filename convention. If you are talking about US Patent 5,579,517 I believe it has expired. See https://patent...
by Bakul Shah
Sat Jun 29, 2019 8:05 am
Forum: General discussion
Topic: Gibberish output from GPS module
Replies: 2
Views: 151

Re: Gibberish output from GPS module

The link you posted says the default baud rate is 9600 while you are specifying 4800. This can be an issue.
by Bakul Shah
Thu Jun 27, 2019 9:41 pm
Forum: General discussion
Topic: Raspberry Pi 4 Thread - general discussion
Replies: 752
Views: 64714

Re: Raspberry Pi 4 Thread - general discussion

With the first 3 bytes fixed and last 3 bytes to play with, you get only 16 million unique MAC addresses and they’ve already sold 26 million units! Expect to see more 3 byte (or six hex digit) prefixes for RPF or RPT! Nope. Just expect to see more address collisions. Rare for individuals. More comm...
by Bakul Shah
Thu Jun 27, 2019 7:34 pm
Forum: General discussion
Topic: Raspberry Pi 4 Thread - general discussion
Replies: 752
Views: 64714

Re: Raspberry Pi 4 Thread - general discussion

WiFi MAC address changes My older Pis up to Pi 3B all have MAC addresses B8:27:EB:xx:xx:xx (Raspberry Pi Foundation) The Pi4 has DC:A6:32:xx:xx:xx (Raspberry Pi Trading) What's the significance of this change - apart from making the Pi a bit harder to spot in IpScan24? With the first 3 bytes fixed ...
by Bakul Shah
Mon Jun 24, 2019 9:33 am
Forum: General discussion
Topic: PiDP-11 Retro Computer
Replies: 13
Views: 943

Re: PiDP-11 Retro Computer

Hmmm... Now if one could only lay hands on a copy of bsd 2.9 to run on the PDP-11 simulator...one could reconstruct UC Berkeley's UNIX-A to -E systems.... BSD 2.11 on PiDP-11: https://github.com/rricharz/pidp11-2.11bsd A mirror of the Unix Heritage Society's Unix-archives (historical Unix versions ...
by Bakul Shah
Sat Oct 13, 2018 1:13 am
Forum: Plan 9
Topic: I/O performance question(s)
Replies: 2
Views: 7162

Re: I/O performance question(s)

You can use venti for backups -- it is a content addressable block storage. It is not the fastest but may be good enough if your incrementals are on the order of few hundred megabytes. You never do *full backup* every month as each unique block is written only once. The end result of each backup is ...
by Bakul Shah
Fri Aug 03, 2018 7:10 am
Forum: Plan 9
Topic: WiFI on Raspberry Pi 3
Replies: 8
Views: 6765

Re: WiFI on Raspberry Pi 3

Could not perform cross-compilation. I even pulled the source from Plan9front and tried to compile it on the device - the attempt ended in failure. Cross-compilation also on Plan9front did not help - could not pull out the executable file - it's just not copied ... I was able to cross-compile with ...
by Bakul Shah
Wed Aug 01, 2018 6:41 am
Forum: Plan 9
Topic: WiFI on Raspberry Pi 3
Replies: 8
Views: 6765

Re: WiFI on Raspberry Pi 3

I heard about this fork. The only thing for which I'm interested in updates is Python 2.5.1 (I could not build it from the sources that I extracted from contrib and plan9front) or ObjectIcon (I simply do not get it from the source code at the linking stage, although it fully adapted to Plan9) :( Wh...
by Bakul Shah
Tue Jul 31, 2018 9:21 pm
Forum: Plan 9
Topic: WiFI on Raspberry Pi 3
Replies: 8
Views: 6765

Re: WiFI on Raspberry Pi 3

There is still a question, if you do not mind: does the update with replica now work? I am afraid not. The sources.cs.bell-labs.com (from where the updates were being pulled) is gone. Note that there are hardly any changes to the base sources any more. If you just want to play with plan9 this is mo...
by Bakul Shah
Tue Jul 31, 2018 9:04 am
Forum: Plan 9
Topic: WiFI on Raspberry Pi 3
Replies: 8
Views: 6765

Re: WiFI on Raspberry Pi 3

See https://www.mail-archive.com/9fans@9fans.net/msg37143.html for some help. It has one mistake: ether1=type=4330 should go in cmdline.txt , not config.txt on the dos partition. See cmdline-wifi.txt for an example. Latest disk image can be downloaded from https://9p.io/sources/contrib/miller/ . You...
by Bakul Shah
Wed Jun 20, 2018 10:12 pm
Forum: General discussion
Topic: Pi Is Too Complicated
Replies: 113
Views: 8758

Re: Pi Is Too Complicated

I would suggest that the Raspberry Pi have a stable operating system targeted for use in teaching computer science that is easy to understand and to modify. But what would that be ? I don't think there are many Operating Systems which are easy to understand and modify, and it's a rather niche area ...
by Bakul Shah
Wed Jun 20, 2018 10:00 pm
Forum: General discussion
Topic: PMs being turned off from June 13
Replies: 54
Views: 5265

Re: STICKY: PMs being turned off from June 13

Is there a way to get an archive of my past PMs (and responses to them)? Thanks.
by Bakul Shah
Fri Apr 13, 2018 2:32 am
Forum: Plan 9
Topic: plan9 support for 3B+
Replies: 0
Views: 8095

plan9 support for 3B+

FYI. Richard Miller has added support for 3B+ to 9pi. From his email to the 9fans list: Apart from 3B+ support (including firmware files for the new wifi chip), this update should make some improvement on all Pi models: slightly faster usb and ethernet, corrections for a few very old Plan 9 bugs flu...
by Bakul Shah
Wed Nov 02, 2016 7:17 am
Forum: Plan 9
Topic: IBM USB keyboard not detected
Replies: 5
Views: 10153

Re: IBM USB keyboard not detected

If nobody has any ideas, perhaps you could tell me a couple of better places/people to ask? Thanks plan9 doesn't handle as many different kinds of keyboards as Linux. You'll have a better chance of success with a basic, nothing fancy keyboard (the one I use is under $10 in the US). As for where to ...
by Bakul Shah
Mon Aug 17, 2015 4:33 am
Forum: Off topic discussion
Topic: Lemon Pi, $35 ARM Quad-core A9 open source board
Replies: 63
Views: 15309

Re: Lemon Pi, $35 ARM Quad-core A9 open source board

This seems to be the same board as (or very very similar to) Actions Technology's bubblegum-s500 devel. board
by Bakul Shah
Thu May 07, 2015 7:06 pm
Forum: Plan 9
Topic: Plan 9 on Raspberry Pi 2
Replies: 4
Views: 12021

Re: Plan 9 on Raspberry Pi 2

kyounger wrote:so has 9pi been made to work on Pi2 with SMP enabled? if so, is there a iso somewhere?
Yes. You can pick up 9pi.img.gz from the link supllied in the first message in this thread.
by Bakul Shah
Fri Feb 06, 2015 6:49 pm
Forum: General discussion
Topic: The Raspberry Pi 2 Q&A thread
Replies: 442
Views: 107529

Re: The Raspberry Pi 2 Q&A thread

I reread the Sept 19, 2012 blog post on the turbo mode (aka the irreversible bit and the voided warranty) but am still not clear. If the bit is set, is the warranty voided? In the context of Pi2, are there any settings (manually done) that will void the warranty?

Thanks!
by Bakul Shah
Wed Aug 27, 2014 7:04 am
Forum: FreeBSD
Topic: Unable to build any ports
Replies: 7
Views: 2527

Re: Unable to build any ports

Has anyone successfully built any port on a Raspberry Pi? I've tried a few but get lots of errors which I don't understand and can't help wondering if I've missed something... When building a port is there normally a buildlog so that I have a record of any error messages generated? I would love to ...
by Bakul Shah
Mon Jul 07, 2014 5:54 pm
Forum: Graphics, sound and multimedia
Topic: Raspberry Pi and 4k @ 15Hz
Replies: 123
Views: 160258

Re: Raspberry Pi and 4k @ 15Hz

Interesting. Can you get 3840 x 2160 @ 24Hz? You may need to increase the hdmi pixel clock limit. It defaults to 163682864. Perhaps try hdmi_pixel_freq_limit=400000000 What is the highest supported pixel clock frequency? On plan9 I can get "4k" @20Hz but at 24Hz the display seems to turn itself off...
by Bakul Shah
Sun Nov 03, 2013 7:50 pm
Forum: Beginners
Topic: IP address for crossover cable
Replies: 36
Views: 4527

Re: IP address for crossover cable

To test, you can just use telnet, no need for the client program! On the linux machine just do telnet 192.168.1.1 1234 It should return something like Trying 192.168.1.1... Connected to 192.168.1.1. Escape character is '^]'. To get out type ctl-] followed with q. If this works then the problem is in...

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