BMC building questions

Question

Hi I got my Turing Pi2 some days ago and experimented a bit with it Nice Now I want to automate the BMC a bit more I found several things while until I got my own BMC rootfs running 1 mnt sdcard is missing from official 1 0 1 preventing updates 2 The docs state for the BMC it is a 1G flash but in fact it seems a only 1GBits = 128MBytes flash What is correct 2 There is a two partion scheme for updating ubi0 5 vs ubi0 6 So when swupdate or OTA does not work You could do something like this when booted from ubi0 6 ``` swupdate i $PWD turingpi 1 0 2 swu e stable upgrade ubi5 fw setenv nand root ubi0 5 ``` In fact this is what the BMC webapp is doing 3 The switch on the TPi2 is according to the docs in a default bridge on all ports How can I change this I like to have VLANs on the Switch ports Is this planned Or better in OpenWRT is Distribute Switch Architecure driver which makes all ports of the switch individual network devices but the switching is offloaded to the hardware That would be nice 4 ADB is not working when the UBI filesystem is in readonly eg when it is to large This is do to system bin sh is created by the initscript as a link ot bin busybox 5 The kernel is not part of the UBI image I am a bit puzzled how the kernel is updated As it is a small linux device I wonder if certain features like wireguard f2fs proper NTFS support via NTFS 3G needs fuse can be included How is the kernel updated I guest it is in ubi0 4 but never touched by any images generated by the official sources so far I see What I am missing

j0jux · Answer

6 The kernel device tree is in UBI though but it is a full blown device tree also including the not used HDMI of the t113 s3 and some more things are defined there and thus activated in the kernel whcih will never work 6 The BMC app is claimed to be opensource but there is an binary blob for the ASP GoAhead engine in the git

j0jux · Answer

7 Is there a description of the flash layout or can someone give some insights I did a dump of all partions an I am puzzled ``` mtd0 boot0 bin SysEx File mtd1 uboot bin data mtd2 secure storage bin data mtd3 sys bin UBI image version 1 ubi0 0 mbr bin data ubi0 1 boot resource bin DOS MBR boot sector code offset 0x3c+2 OEM ID mkfs fat sectors cluster 4 root entries 512 sectors 4096 volumes <=32 MB Media descriptor 0xf8 sectors FAT 3 sectors track 32 heads 64 serial number 0xa7734277 unlabeled FAT 12 bit ubi0 2 env bin data ubi0 3 env redund bin data ubi0 4 boot bin Android bootimg kernel 0x40200000 ramdisk 0x41200000 page size 2048 ubi0 5 rootfs bin UBIfs image sequence number 19617 length 4096 CRC 0xd8c7d38f ubi0 6 recovery bin UBIfs image sequence number 20007 length 4096 CRC 0x2e35dbf3 ubi0 7 dsp0 bin ELF 32 bit LSB executable Tensilica Xtensa version 1 SYSV statically linked stripped ubi0 8 private bin ISO 8859 text with very long lines 65536 with no line terminators ubi0 9 UDISK bin ISO 8859 text with very long lines 65536 with no line terminators cat mtd txt dev size erasesize name mtd0 00100000 00040000 boot0 mtd1 00300000 00040000 uboot mtd2 00100000 00040000 secure storage mtd3 07b00000 00040000 sys cat ubi txt name size mbr 16777216 boot resource 2322432 env 1290240 env redund 1290240 boot 18063360 rootfs 33804288 recovery 33804288 dsp0 1290240 private 1290240 UDISK 10579968 ``` Why is there an xtensa Image This looks like the demo application for the Allwinner T113 s3 Pretty useless without HDMI or sound

j0jux · Answer

8 How to enter Uboot CTRL C does not work 9 The random MAC address issue I solved by adding an mac variable to UBoots environement if it is empty or not defined This is automagically given as kernel parameter and then might be extracted by the ifupdown script best regards

terry6200 · Answer

ubi0 5

j0jux · Answer

I figured that out a while ago Which ended in a pre 1 0 firmware repository with some reversing docs here https github com j0ju turing pi this repos is not latest and update anymore