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| 4 Mb DRAM during boot - faulty Carambola? https://www.8devices.com/community/viewtopic.php?f=13&t=841 |
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| Author: | usa303 [ 24 Nov 2014, 23:10 ] |
| Post subject: | 4 Mb DRAM during boot - faulty Carambola? |
Hello, We bought recently 20 pcs of Carambola2 for our test project. Carambola modules are installed on our board that provides all voltages and control signals. The problem is that 4 out of 20 boards stopped on U-boot stage with the following message: U-Boot 1.1.4-g33f82657-dirty (Sep 16 2013 - 16:09:28) ===================================== CARAMBOLA2 v1.0 (AR9331) U-boot http://www.8devices.com/ ------------------------------------- DRAM: 4 MB and nothing after that. I checked voltage (it is 3.3V), and state of Reset signal - all seems OK. The rest of boards work well. Is it possible that we got faulty Carambola2 boards, or we should consider others possibilities? Carambola modules have been soldered to our board with standard lead-free reflow profile. |
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| Author: | FPeter [ 25 Nov 2014, 02:15 ] |
| Post subject: | Re: 4 Mb DRAM during boot - faulty Carambola? |
| Author: | usa303 [ 25 Nov 2014, 09:14 ] |
| Post subject: | Re: 4 Mb DRAM during boot - faulty Carambola? |
GPIO12 is not used in our board. I guess, it has pull-down resistor right on Carambola2 module, so we can leave it unconnected. The same is done on Carambola2 dev.board. |
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| Author: | FPeter [ 25 Nov 2014, 14:30 ] |
| Post subject: | Re: 4 Mb DRAM during boot - faulty Carambola? |
| Author: | MotusLab [ 18 Mar 2015, 09:38 ] |
| Post subject: | Re: 4 Mb DRAM during boot - faulty Carambola? |
I've the same problem, any solution? |
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| Author: | Giedrius [ 18 Mar 2015, 10:53 ] |
| Post subject: | Re: 4 Mb DRAM during boot - faulty Carambola? |
Are you using development board or a custom PCB? |
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| Author: | mobius [ 08 Mar 2016, 08:46 ] |
| Post subject: | Re: 4 Mb DRAM during boot - faulty Carambola? |
I am having a similar problem. Does anyone have any more information on this issue? Thank you! |
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| Author: | gedass [ 08 Mar 2016, 09:37 ] |
| Post subject: | Re: 4 Mb DRAM during boot - faulty Carambola? |
| Author: | mobius [ 08 Mar 2016, 16:22 ] |
| Post subject: | Re: 4 Mb DRAM during boot - faulty Carambola? |
@gedass Thanks for your reply. The module is soldered on to a custom board. Power supplies are OK. I have tested with an external PSU plus the onboard PSU is good. Could the DDR2 RAM be an issue? Is there a way to verify this? |
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| Author: | gedass [ 08 Mar 2016, 18:41 ] |
| Post subject: | Re: 4 Mb DRAM during boot - faulty Carambola? |
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