Hi, it seems that the linux-sunxi guys have used this before: http://linux-sunxi.org/JTAG it is an adapter to attach a debug via the pins of the microsd card socket. If you compare that to the Pine schematic, the pins seem to be there: http://files.pine64.org/doc/Pine%20A64%2...elease.pdf so there could be a possibility to have JTAG access. The question is, what would you want to do with it? You can use the FEL mode bootloader via USB if you want off-board images running from your development box for example, or are you looking into bare-metal programming?
Maybe talk to the kernel developers over at #linux-sunxi at Freenode...
Maybe talk to the kernel developers over at #linux-sunxi at Freenode...
Come have a chat in the Pine IRC channel >>