#garfield Logs

Apr 05 2022

04:50 AM Tom_L: morning
05:15 AM rue_mohr: AAAH
05:32 AM rue_mohr: I'm playing with reverse engineering a samsung drive
05:32 AM rue_mohr: its got a "marvel" controller, their, ... odd
05:34 AM rue_mohr: having to use the serial port tho, I cant get any of these darn things to answer jtag
07:09 AM Tom_L: what you gonna do if it phones home?
07:29 AM rue_mohr: heh, it cant anymore most of its brain is gone
07:29 AM rue_mohr: its an arm processor
07:29 AM rue_mohr: but
07:30 AM rue_mohr: not the same as the stm32
07:30 AM rue_mohr: I should take a nap
08:56 AM rue_mohr: it LOOKS like they use uboot
01:45 PM WormFood: This is interesting. I've been downloading an eprom image, every 30 seconds, while the eprom erases. I just now figured out, how to add a bmp header to each eprom image, and then turned them into a video, showing a graphical representation of the memory as it erases. What is interesting, is that the bits flicker, before being totally erased.
04:48 PM rue_mohr: yea, whitequark worked that out
04:48 PM rue_mohr: bad bits oscillate
04:48 PM rue_mohr: as it were
04:48 PM rue_mohr: you can play with the voltage on the chip a bit and get moof out what the values of a bad rom should be
04:48 PM rue_mohr: iirc thats how it went
04:55 PM Tom_L: picked up some dowel pins to play with
04:55 PM Tom_L: had an idea but don't think it will work
04:55 PM rue_mohr: ?
04:56 PM rue_mohr: you can just shape the top of a bar tho
04:56 PM rue_mohr: those pins were the only way I could do it
04:56 PM Tom_L: it's quick and easy
04:56 PM rue_mohr: :)
04:57 PM Tom_L: i'd have to sit down and write a program for the boss etc
05:13 PM rue_mohr: WormFood,
05:13 PM rue_mohr: https://twitter.com/elektronaut1/status/1498045224727183360
05:33 PM WormFood: rue_mohr, I've seen that before. I'm doing it under Linux :P Would you like to see my video?
05:34 PM WormFood: so far I've gotten over 6300 images. it's almost 80% erased now. I'm using the wrong color UV light
05:42 PM rue_mohr: bugger the power went out
05:43 PM rue_mohr: I wonder how the UPS' are going to do
05:43 PM rue_mohr: WormFood, cool, I'll wait till its done
05:43 PM rue_mohr: give it some funkey music
05:43 PM rue_mohr: peer gynt?
08:25 PM Tom_L: rue_mohr,
08:32 PM Tom_L: http://tom-itx.no-ip.biz:81/~webpage/rue/Can_Holder/A9_New/MODS/fixture/A9_Fixture6.jpg
08:32 PM Tom_L: http://tom-itx.no-ip.biz:81/~webpage/rue/Can_Holder/A9_New/MODS/fixture/A9_Fixture7.jpg
08:32 PM Tom_L: http://tom-itx.no-ip.biz:81/~webpage/rue/Can_Holder/A9_New/MODS/fixture/A9_Fixture8.jpg
08:32 PM Tom_L: http://tom-itx.no-ip.biz:81/~webpage/rue/Can_Holder/A9_New/MODS/fixture/A9_Fixture9.jpg
08:32 PM Tom_L: http://tom-itx.no-ip.biz:81/~webpage/rue/Can_Holder/A9_New/MODS/fixture/A9_Fixture10.jpg
08:35 PM Tom_L: need to add a block to the top for pin clearance
08:38 PM Tom_L: http://tom-itx.no-ip.biz:81/~webpage/rue/Can_Holder/A9_New/MODS/fixture/A9_Fixture11.jpg
09:12 PM Tom_L: may not work.. it may not bend it far enough with the springback
09:40 PM Tom_L: http://tom-itx.no-ip.biz:81/~webpage/rue/Can_Holder/A9_New/MODS/fixture/A9_Fixture12.jpg
09:40 PM Tom_L: http://tom-itx.no-ip.biz:81/~webpage/rue/Can_Holder/A9_New/MODS/fixture/A9_Fixture13.jpg
09:41 PM Tom_L: http://tom-itx.no-ip.biz:81/~webpage/rue/Can_Holder/A9_New/MODS/fixture/A9_Fixture14.jpg
09:41 PM Tom_L: better than i thought..
09:41 PM Tom_L: i should have used a little lube on it but i think i need to remake that top piece
09:41 PM Tom_L: i kinda screwed up and it has a step as you can see
09:41 PM Tom_L: i may try blending the step first
10:23 PM Tom_L: ok i think i fixed it but i don't have another annealed part to bend that i know of
10:28 PM rue_mohr: hi
10:28 PM Tom_L: hi
10:29 PM rue_mohr: ah, huh
10:30 PM rue_mohr: it didn't cup the top..
10:30 PM rue_mohr: cool
10:30 PM Tom_L: is it supposed to?
10:31 PM rue_mohr: no
10:31 PM Tom_L: i rounded that step so it shouldn't grab the material now
10:31 PM Tom_L: if it does, i'll make another top
10:31 PM rue_mohr: without the top being supported during the bend, I didn't expect it to come out ok
10:32 PM Tom_L: how long and hot did you heat those tabs to anneal them?
10:32 PM Tom_L: i have one i know is hard
10:32 PM rue_mohr: you should find that the bottom corners just need to come off them now, and it would slide right into the pipe
10:32 PM rue_mohr: I used the propane torch till the flame comming off them started to bounce of orange
10:33 PM Tom_L: ok
10:33 PM Tom_L: i think i have one more that is soft but i'm not sure
10:33 PM Tom_L: those sides won't hurt anything since they get ground down anyway
10:33 PM Tom_L: just pissed me off
10:34 PM rue_mohr: the tempered one had the taps snap off pretty clearly
10:34 PM Tom_L: just 2 though right?
10:34 PM rue_mohr: on A9, the bottom outter corners need to be sanded back after bending to fit in the pipe
10:35 PM Tom_L: i know
10:35 PM rue_mohr: I only wrecked one
10:35 PM Tom_L: ok
10:35 PM rue_mohr: one other is just "stressed"
10:35 PM rue_mohr: it started to crack and I stopped and annealed it
10:35 PM Tom_L: the one i did bent like butter
10:36 PM rue_mohr: yep
10:36 PM Tom_L: need a little fixture or something to tap the top off after it's pressed together
10:36 PM Tom_L: it wasn't hard to get off but sticks a little
10:37 PM rue_mohr: yup, aluminum
10:37 PM Tom_L: or wood
10:37 PM rue_mohr: I mean sticky aluminum
10:37 PM Tom_L: oh
10:37 PM Tom_L: well the ears push out a little on it
10:37 PM Tom_L: it actually worked better than i expected the first time off
10:42 PM rue_mohr: heh, the top might have to be hinged and the bottom undercut ;)
10:49 PM rue_mohr: ok I have to be carefull, 2am creeps up really freaking fast
10:49 PM Tom_L: yeah it's nearly lights out here
10:50 PM Tom_L: neighbor's dog kept me up last night
10:50 PM rue_mohr: ouch
10:51 PM Tom_L: went out sometime around 3 or so and turned the back light on and told him to stfu
10:52 PM Tom_L: just making sure he wasn't barking for a reason
10:52 PM rue_mohr: locked out
10:52 PM Tom_L: yeah i don't think they were home
10:52 PM Tom_L: they have a small farm they go to sometimes
10:53 PM Tom_L: he's an outside dog anyway
10:59 PM Tom_L: maybe if i drill another hole in the top i can put a 3rd dowel in to tap the part free
10:59 PM Tom_L: just thru the top part
11:00 PM Tom_L: my local guy had some used oversize reamers he gave me i used on the top
11:09 PM rue_mohr: nice
11:09 PM rue_mohr: how oversize?