7 ms·

I've got a device which I've bricked through CFE in a similar manner, I'm probably not going to unbrick it like this though :) Any tips on a cheap way to flash

by dvdkon 6y ago

I've got a device which I've bricked through CFE in a similar manner, I'm probably not going to unbrick it like this though :) Any tips on a cheap way to flash parallel NAND?

monocasa 6y ago
There's a lot of solutions for clipping a programmer on to an in circuit parallel Flash chip in the dozens of dollars range.
- merbanan 6y ago
  I never got a clip-on adapter working on later generation Broadcom devices. On previous ones I shorted the cs-pin to make the nand chip disappear from the SoC. Then you could flash the chip.
  - monocasa 6y ago
    Were you trying to flash while the device was on?
    - merbanan 6y ago
      Yes, the clip-on adapter could not power the chip in-circuit. So I use the power from the board. As I said this worked fine on some boards but not others.
      - monocasa 6y ago
        I would see what's wrong with your clip. They're supposed to provide power.
- rtpg 6y ago
  I have never found one for TSOP-48 chips beyond the 360-clip/wii-clip, do you know of others in that space for this size of chip?
  - monocasa 6y ago
    There's a bunch on alibaba. A quick search also as this popping up, but I haven't tried them. https://shop.zeigren.com/ https://shop.zeigren.com/
justdionysus 6y ago
I've used a clip similar to the "360-clip" to reflash TSOP-48 NAND flash without desoldering. Honestly, I found it easier to desolder with chipquik than try to get a clip like the above to work though. Chipquik and a breakout board and then a SD/MMC controller (see: http://www.trapbit.com/reports/blueray-blues-1.pdf http://www.trapbit.com/reports/blueray-blues-1.pdf) Edit: but, also, I'm pretty bad at this stuff and hope someone jumps in with some more experience / saner advice
- bri3d 6y ago
  This is totally reasonable advice IMO. TSOP clips are an option and work OK, but are expensive and fiddly. Rework onto a breakout board is usually the cheapest and easiest option, whether hot air or chipquik. Another sketchy option is deadbug to the chip in situ (using solder or microclips), or test points if you're lucky and they are provided. This can be quite questionable depending on how backfeeding power into the board via the chip's Vcc works out, but is sometimes possible.
merbanan 6y ago
Arm based devices have an early boot menu accessible by holding the "a" button. From here boot with fail-safe defaults.
- monocasa 6y ago
  Arm based devices are not consistent enough with their bootloader to allow such a thing.
  - merbanan 6y ago
    Broadcom arm-based devices should have it.
    - monocasa 6y ago
      The raspberry pi is a broadcom arm-based device and doesn't have it. Perhaps if you listed a specific product segment, that might be more enlightening.

by dvdkon 6y ago

I've got a device which I've bricked through CFE in a similar manner, I'm probably not going to unbrick it like this though :) Any tips on a cheap way to flash parallel NAND?

monocasa 6y ago

There's a lot of solutions for clipping a programmer on to an in circuit parallel Flash chip in the dozens of dollars range.

merbanan 6y ago
I never got a clip-on adapter working on later generation Broadcom devices. On previous ones I shorted the cs-pin to make the nand chip disappear from the SoC. Then you could flash the chip.
- monocasa 6y ago
  Were you trying to flash while the device was on?
  - merbanan 6y ago
    Yes, the clip-on adapter could not power the chip in-circuit. So I use the power from the board. As I said this worked fine on some boards but not others.
    - monocasa 6y ago
      I would see what's wrong with your clip. They're supposed to provide power.
rtpg 6y ago
I have never found one for TSOP-48 chips beyond the 360-clip/wii-clip, do you know of others in that space for this size of chip?
- monocasa 6y ago
  There's a bunch on alibaba. A quick search also as this popping up, but I haven't tried them. https://shop.zeigren.com/ https://shop.zeigren.com/

justdionysus 6y ago

I've used a clip similar to the "360-clip" to reflash TSOP-48 NAND flash without desoldering. Honestly, I found it easier to desolder with chipquik than try to get a clip like the above to work though. Chipquik and a breakout board and then a SD/MMC controller (see: http://www.trapbit.com/reports/blueray-blues-1.pdf http://www.trapbit.com/reports/blueray-blues-1.pdf) Edit: but, also, I'm pretty bad at this stuff and hope someone jumps in with some more experience / saner advice

bri3d 6y ago
This is totally reasonable advice IMO. TSOP clips are an option and work OK, but are expensive and fiddly. Rework onto a breakout board is usually the cheapest and easiest option, whether hot air or chipquik. Another sketchy option is deadbug to the chip in situ (using solder or microclips), or test points if you're lucky and they are provided. This can be quite questionable depending on how backfeeding power into the board via the chip's Vcc works out, but is sometimes possible.

merbanan 6y ago

Arm based devices have an early boot menu accessible by holding the "a" button. From here boot with fail-safe defaults.

monocasa 6y ago
Arm based devices are not consistent enough with their bootloader to allow such a thing.
- merbanan 6y ago
  Broadcom arm-based devices should have it.
  - monocasa 6y ago
    The raspberry pi is a broadcom arm-based device and doesn't have it. Perhaps if you listed a specific product segment, that might be more enlightening.