06:57 <Necrosporus> Hi there. I have discovered that my device based on AMLOGIC MESON3 8726M SKT SH writes this messages when SD card is inserted: Hit any key to stop autoboot: 0 // auto upgrade from sdcard... // command: mmc read 0 82000000 400 200 // MMC read: dev # 0, addr # 400, byte count 200 ... 1 blocks read: OK

06:58 <Necrosporus> This suggest that I can write something to the third 512-byte sector of an SD card to make it bootable. The question is what it could be?

11:14 <chewitt> signed u-boot

11:15 <chewitt> the issue you have is, you don't have the u-boot sources for your box/board

11:15 <chewitt> and mainline u-boot doesn't support anything below Meson 9

11:16 <chewitt> the box boots from nand/emmc first, always, if there is signed u-boot there

11:17 <chewitt> it will also boot from an SD card, but to force this and test whatever u-boot things you can find in github etc. to experiment with, you'll have to wipe the emmc

11:48 <asdf28> chewitt: a few weeks ago, you gave me a patch for adding p212 audio support to linux

11:48 <asdf28> i tried it yesterday, it works great. thanks!

12:32 <Necrosporus> chewitt, I have SPI NOR and NAND chips there

12:32 <Necrosporus> Also I have had wiped SPI nor by mistake and it did indeed run u-boot from begginning of an SD card

12:33 <Necrosporus> chewitt, regarding u-boot sources, how do you know I don't have it? I mean maybe they are downloadable from some vendor FTP, I didn't look for them yet though

12:38 <Necrosporus> chewitt, I can probably chainload u-boot from external card with something like fatload and bootm

12:50 <Necrosporus> chewitt, but maybe I can just change signature of u-boot or whatever?

12:50 <Necrosporus> Though I did achieve what I wanted by changing bootcmd env variable and running saveenv, then the device checks for SD card and if it's inserted, runs the kernel from it

12:51 <Necrosporus> if not, it runs from nand

12:56 <Necrosporus> I have found a similar board booting with same message: MyGica ATV510B Android boot https://pastebin.com/raw/9ZBbt8AX (made in 2013, not my paste)

13:03 <Necrosporus> [ 3.710547] Creating 2 MTD partitions on "apollospi:0":

13:03 <Necrosporus> [ 3.715723] 0x00000004e000-0x000000050000 : "ubootenv"

13:03 <Necrosporus> How do I read unpartitioned space on SPI flash from the loaded OS? Is it possible?

13:03 <Necrosporus> [ 3.721885] 0x0000003fe000-0x000000400000 : "ids"

13:03 <Necrosporus> I have been able to dump it from u-boot with md.b though