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by chocis
Fri May 09, 2014 6:20 am
Forum: General discussion
Topic: Format SD card on Linux, by fully erasing NAND content.
Replies: 6
Views: 3488

Re: Format SD card on Linux, by fully erasing NAND content.

Thank you guys, but none of these still answers the question. How to erase SD card completely from Linux (if it supports ERASE) command.
by chocis
Thu May 08, 2014 8:54 am
Forum: General discussion
Topic: Format SD card on Linux, by fully erasing NAND content.
Replies: 6
Views: 3488

Format SD card on Linux, by fully erasing NAND content.

Hi, recently I've done some research on how SD card's internal NAND memory and its controller work and I've come to conclusion that 80% of tutorials and advices about formatting SD card are wrong, because many do not understand the internal wear-leveling functionality. There are already many discuss...
by chocis
Thu Apr 24, 2014 9:19 pm
Forum: General discussion
Topic: The longest living SD card solution.
Replies: 9
Views: 7388

Re: The longest living SD card solution.

Yes, thank you, I saw it. Did some reading on F2FS, but need some more investigation. I guess the most two important aspects are life of SD card and file system stability (journal). If F2FS can provide that, then its fine. After some reading didn't really understand if it gives benefit for flash lif...
by chocis
Thu Apr 24, 2014 7:23 pm
Forum: General discussion
Topic: The longest living SD card solution.
Replies: 9
Views: 7388

Re: The longest living SD card solution.

The main idea is having an embedded box (doh) with a network connection, where written/backuped data are now and then sent/received from server. And of course this box should work as long as possible without SD corruption. Use cases: - RPi receives data from many sensors, but there is no network ava...
by chocis
Thu Apr 24, 2014 5:57 pm
Forum: General discussion
Topic: The longest living SD card solution.
Replies: 9
Views: 7388

Re: The longest living SD card solution.

Yes, I completely understand the possibility of writing to /tmp and later moving to SD card or specific mount options for rootfs partition to reduce writes. I will make the desired result more specific: Imagine I have 1st partition containing rootfs mounted as read only. And the rest of SD card is a...
by chocis
Thu Apr 24, 2014 1:04 pm
Forum: General discussion
Topic: The longest living SD card solution.
Replies: 9
Views: 7388

The longest living SD card solution.

HI, i've done quite a research regarding SD card lifespan and would like to discuss a 'best' scenario for application, that will live the longest life without corrupting SD card and it should work after a brutal power cycle. Because SD cars, USB flash dongles, eMMC, SSD drives are based on NAND tech...
by chocis
Wed Jan 16, 2013 8:02 pm
Forum: Bare metal, Assembly language
Topic: SD driver problems
Replies: 22
Views: 4282

Re: SD driver problems

O thanks guys. Finally I know in which year my card is manufactured, but of course that wasn't the important part. :)
I am very interested where did you get this information? (that first 8 bits are shifted, there is no CRC)?
by chocis
Sun Jan 06, 2013 8:20 pm
Forum: Bare metal, Assembly language
Topic: SD driver problems
Replies: 22
Views: 4282

Re: SD driver problems

Hi, guys. I am trying to achieve the same thing - read CID parameters, but I have a strange response. (I am following DexOS source code, but with C) //ALL_SEND_CID (CMD2) - Request all cards to send their unique CID numbers. POINTVAL_(MMC_ARG1) = 0x00000000; //0x02010000 binary is "00000010 00000001...
by chocis
Wed Nov 14, 2012 7:25 am
Forum: Android
Topic: system UI has stopped android 4.0
Replies: 7
Views: 5560

Re: system UI has stopped android 4.0

Seriously, you should read information in page you downloaded the image. Current status CyanogenMOD 9 (based on Android 4.0): Boots, unusable Framebuffer issues: possibly due to the lack of double buffering and/or page flipping in the bcm2708 framebuffer driver Proper libEGL library not present: lib...
by chocis
Mon Nov 05, 2012 6:47 pm
Forum: Android
Topic: Project: Android JB 4.1 with Hardware acceleration
Replies: 126
Views: 96701

Project: Android JB 4.1 with Hardware acceleration

Hi, recently I bought RPi to start learning embedded Linux and Android development. Since then it's been super fun :) Purpose of this topic: There are few threads going on about Android porting on RPi, but I wanted to start a new one specially for JB and hardware acceleration functionality. My progr...

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