Hacking PXA270 internal USB HOST

[afarre]

Originally Posted by radish28

So do any of you have any background in electronics engineering or anything similar? I dont see this being fruitful at all if not.

Take a look at some previous posts like #59 and #140.
See also user public profiles.

[afarre]

Originally Posted by bigbop

OK - I received the X51v board finally and I'm looking at it. It will take me a little while to check this out and I'm taking pictures and making notes as I go through this so please bear with me as it's also starting to get busy where I work - you know - real work.

I also found this interesting link on a Chinese(?) "Programmers United Development Network" website:
http://www.pudn.com/downloads51/sour...4%CB%FB&kw=USB
And Google can translate it:
http://translate.google.com/translat...lr%3D%26sa%3DN

Take your time and thank you for your effort.
Very interesting link.
I have tried to download the USB host driver. I had to create a user, it took me a lot of time, I finally got it writing my user name in chinese. Now I think it is expected some upload to enable downloading, but still having problems with chinese, the translator and filling formats in between
Any chinese user traking this thread?

[yeung_bt]

Originally Posted by afarre

Take your time and thank you for your effort.
Very interesting link.
I have tried to download the USB host driver. I had to create a user, it took me a lot of time, I finally got it writing my user name in chinese. Now I think it is expected some upload to enable downloading, but still having problems with chinese, the translator and filling formats in between
Any chinese user traking this thread?

I can read Chinese. Pls let me know if I can help.

[afarre]

Originally Posted by yeung_bt

I can read Chinese. Pls let me know if I can help.

Could you please download the driver "winceUSBHost"?
http://www.pudn.com/downloads51/sour...4%CB%FB&kw=USB

Same page has also a link to some "WINCE-usb-DRIVER", it could also be interesting.

You can also search the site, any other USB drivers for Windows CE would be also helpful.

Let me know if you need to upload source to enable downloading.

[yeung_bt]

Originally Posted by afarre

Could you please download the driver "winceUSBHost"?
http://www.pudn.com/downloads51/sour...4%CB%FB&kw=USB

Same page has also a link to some "WINCE-usb-DRIVER", it could also be interesting.

You can also search the site, any other USB drivers for Windows CE would be also helpful.

Let me know if you need to upload source to enable downloading.

I need to upload any five C or JAVA source code programs before they allow me to download 'winCEUSBHost'. i.e. they need me to contribute first before I can take anything from the site.

[afarre]

Originally Posted by yeung_bt

I need to upload any five C or JAVA source code programs before they allow me to download 'winCEUSBHost'. i.e. they need me to contribute first before I can take anything from the site.

Have you seen any other condition?
Like if they should be drivers, or if C++ is also accepted, etc.
Give me some time to see if I have 5 "interesting" souce code to upload.

[yeung_bt]

Originally Posted by afarre

Have you seen any other condition?
Like if they should be drivers, or if C++ is also accepted, etc.
Give me some time to see if I have 5 "interesting" souce code to upload.

They just said these need to be 'high quality' source code and also need the endorsement from the web administrator.

[afarre]

Originally Posted by yeung_bt

They just said these need to be 'high quality' source code and also need the endorsement from the web administrator.

I am afraid I do not have such software that I can upload.

[bigbop]

Originally Posted by radish28

So do any of you have any background in electronics engineering or anything similar? I dont see this being fruitful at all if not.

I've worked with electronics for the past 45 years - 30 of those with one of the largest tech companies in the world. I grew up with electron tubes and germanium transistors - graduated to RTL logic, then DTL and TTL. I've seen it all and then some. For 'entertainment' I like to redesign stuff.

[Mystik]

any new progress bigbop?

it's been a while since anyone's been updated. i'm curious to see how things are progressing.

[bigbop]

Originally Posted by Mystik

any new progress bigbop?

it's been a while since anyone's been updated. i'm curious to see how things are progressing.

I finally found the engineer who knew how to set the temperature profile on the BGA rework machine: http://www.ape.com/flomaster_z.html
I'll try to remove the CPU on Friday.

One interesting thing I found was that pins 20 & 24 seem to be capacitively coupled to something. Don't know what yet and I don't want to speculate (but it would be nice to have a stereo line input) but I'm not speculating

As I stated earlier, I have to do this at work when I have some spare time so please be patient.

[Mystik]

Originally Posted by bigbop

I finally found the engineer who knew how to set the temperature profile on the BGA rework machine: http://www.ape.com/flomaster_z.html
I'll try to remove the CPU on Friday.

One interesting thing I found was that pins 20 & 24 seem to be capacitively coupled to something. Don't know what yet and I don't want to speculate (but it would be nice to have a stereo line input) but I'm not speculating

As I stated earlier, I have to do this at work when I have some spare time so please be patient.

i'm doing my best to be patient here, just wanted to know that things were moving

thanks for the update

[afarre]

Originally Posted by bigbop

I finally found the engineer who knew how to set the temperature profile on the BGA rework machine: http://www.ape.com/flomaster_z.html
I'll try to remove the CPU on Friday.

One interesting thing I found was that pins 20 & 24 seem to be capacitively coupled to something. Don't know what yet and I don't want to speculate (but it would be nice to have a stereo line input) but I'm not speculating

As I stated earlier, I have to do this at work when I have some spare time so please be patient.

Time ago I read somewhere in the web the time and temperature to set to a home oven to remove BGA chips

[bigbop]

Originally Posted by afarre

Time ago I read somewhere in the web the time and temperature to set to a home oven to remove BGA chips

Yes, you might be able to do that but remember - you're going to melt the solder on every part and you still have to place your hands into the oven with a pair of tweezers to grab and remove the part, without touching anything else around it.

I've been taking my time with this so that I can learn how to use the rework equipment (FloMaster) so I don't (hopefully) damage anything on the X51v PCB.

The rework equipment has a high temperature suction cup that pulls the part off the PCB when the solder melts. This is what PocketPC Techs use to do their RAM upgrade.

[bigbop]

Finally got the cpu removed. It wasn't as straight forward as I thought but it eventually popped off, leaving most of the solder balls intact.

There are no obvious traces from the USB host pins but neither are there from the USB client pins. There are a ton of buried (blind) vias on this board. The PCB technology is just amazing. You're probably looking at an 8 layer circuit board!

In any case, if any of you have X-ray eyes, gaze upon the photo below and tell us what each pin is connected to....