08:48 <keoLEg> hi I have a bananapro whic has A20 on it. And I made a linux distribution with yocto but somehow a littile bit confused about flashing the SD card. Should I dd the bootloader to the first partition of SD card . Are there any sector issues , because in the document it is stated as dd if=u-boot-sunxi-with-spl.bin of=${card} bs=1024 seek=8

08:51 <DuClare> That's obviously dd onto the card, not in any partition

08:59 <diego71> $card should be something like /dev/mmc0 or /dev/sdb

09:00 <diego71> otherwise you probably corrupt the filesystem in the partition

10:29 <apritzel> keoLEg: the BootROM in the SoC looks at said sector on the SD card (that's hardwired), so that's where the bootloader (the very first user code to run) needs to live

10:29 <apritzel> keoLEg: the BROM has no idea nor does it care about any partitions

10:30 <apritzel> typically most partitioning tools let the first partition start at only 1MB anyways, which leaves that part free for the bootloader

10:31 <apritzel> so yes: you need to dd u-boot-sunxi-with-spl.bin to sector 16 (8KB), and then you can have any partitions you like, just don't assign the first MB of the card

12:37 <keoLEg> diego71: card is exported as card=/dev/mmcblk0 in the documentation. I used it as /dev/mmcblk0.

13:12 <apritzel> keoLEg: the device name depends on how the device is attached. When you use an USB card reader, it's typically /dev/sd<X>, otherwise /dev/mmcblk<x>

13:13 <apritzel> but in any case you have to write the bootloader to the raw device, not to any partition