State of this experiment as of December 2022

[icedream]

I didn't find time to continue working on custom firmware for the PRIME 4 again, as you probably noticed. In fact, the amount of times I've actually turned on my DJ controller in the months since October has decreased to exactly 0 as I've not been in the mood to play around with it at all, following several happenings in private life (had to take care of things around my dad as he suffered a stroke) as well as just generally feeling zapped off energy.

I also noticed a general slowdown in developments around the PRIME 4 (initial impression just looking over it again now). I still would love to see Mixxx running on the PRIME 4, but the main issue which stopped me from getting the experience started are issues with the graphics which I couldn't solve. Apps would either start rotated (due to the nature of touchscreens such as the one built into the PRIME 4), incredibly scaled up or just would fail to recognize the GPU properly (as was the case for chocolate-doom which is why that PoC still is not working at all).

At this point, I'm not sure whether the firmware ships some tweaked version of Qt or the needed driver to get rendering to the GPU working. The driver shipping with Buildroot does not seem to work reliably, and it's turned out difficult to look into this issue with buildroot in general - it is definitely not designed to provide "partial builds" but instead it would be preferable to somehow have it set up so it can build a complete firmware package right from scratch. Just replacing some files has some randomness to it working or not working.

I last attempted to update this repository to support the other devices that engine OS is available for. No way to test this reliably for me of course since I only own a PRIME 4, but the idea technically works. Also honestly kind of just sucks to do with the rudimentary build system based on the shell scripts in the repository.

Anyways, just wanted to report where I last got stuck with this. I hopefully can pick this back up in my upcoming vacation around end of this year, and once I am done coding other stuff (I'm currently also working on a migration tool for Twitter profiles to Mastodon).

[icedream]

Also don't get your hopes up for the SC LIVE devices… their firmware seems to use some proprietary format.

[dzelionis]

That's normal, everyone has their real life...so i don't think you need to explain anything to anyone... :D regarding SC LiIVE strange,
is that still using same rk3288 cpu and motherboard?

[honusz]

They did make some mention of having to meet some kind of secure computing requirements for in order to use Amazon Music, perhaps it's related to that.

[dzelionis]

Looks like hardware is Intel x86 or x64 based.... binwalk diff looks completely different from prime image, just for ref binwalk of SC Live 4:

domas.zelionis@LinuxBigMate:/denon$ binwalk SCLIVE4-2.4.0-Update.img 

DECIMAL       HEXADECIMAL     DESCRIPTION
--------------------------------------------------------------------------------
1008          0x3F0           Flattened device tree, size: 1468 bytes, version: 17
23524         0x5BE4          Certificate in DER format (x509 v3), header length: 4, sequence length: 28927
50640         0xC5D0          SHA256 hash constants, little endian
89888         0x15F20         CRC32 polynomial table, little endian
108168        0x1A688         Flattened device tree, size: 6278 bytes, version: 17
115116        0x1C1AC         Flattened device tree, size: 1632 bytes, version: 17
119184        0x1D190         CRC32 polynomial table, little endian
343540        0x53DF4         SHA256 hash constants, little endian
377191        0x5C167         mcrypt 2.2 encrypted data, algorithm: blowfish-448, mode: CBC, keymode: 4bit
379963        0x5CC3B         mcrypt 2.2 encrypted data, algorithm: blowfish-448, mode: CBC, keymode: 4bit
387543        0x5E9D7         mcrypt 2.2 encrypted data, algorithm: blowfish-448, mode: CBC, keymode: 4bit
423497        0x67649         LZO compressed data
473383        0x73927         Intel x86 or x64 microcode, sig 0x00001001, pf_mask 0x502b301, 2000-05-14, size 1
530204        0x8171C         Flattened device tree, size: 62448 bytes, version: 17
592656        0x90B10         Flattened device tree, size: 1468 bytes, version: 17
615172        0x96304         Certificate in DER format (x509 v3), header length: 4, sequence length: 28927
642232        0x9CCB8         SHA256 hash constants, little endian
681480        0xA6608         CRC32 polynomial table, little endian
699760        0xAAD70         Flattened device tree, size: 6006 bytes, version: 17
706764        0xAC8CC         Flattened device tree, size: 1616 bytes, version: 17
710816        0xAD8A0         CRC32 polynomial table, little endian
935172        0xE4504         SHA256 hash constants, little endian
968823        0xEC877         mcrypt 2.2 encrypted data, algorithm: blowfish-448, mode: CBC, keymode: 4bit
971595        0xED34B         mcrypt 2.2 encrypted data, algorithm: blowfish-448, mode: CBC, keymode: 4bit
979175        0xEF0E7         mcrypt 2.2 encrypted data, algorithm: blowfish-448, mode: CBC, keymode: 4bit
1015129       0xF7D59         LZO compressed data
1065015       0x104037        Intel x86 or x64 microcode, sig 0x00001001, pf_mask 0x502b301, 2000-05-14, size 1
1121836       0x111E2C        Flattened device tree, size: 56504 bytes, version: 17
1178344       0x11FAE8        Flattened device tree, size: 1468 bytes, version: 17
1200860       0x1252DC        Certificate in DER format (x509 v3), header length: 4, sequence length: 28927
1227920       0x12BC90        SHA256 hash constants, little endian
1267168       0x1355E0        CRC32 polynomial table, little endian
1285448       0x139D48        Flattened device tree, size: 6006 bytes, version: 17
1292452       0x13B8A4        Flattened device tree, size: 1616 bytes, version: 17
1296504       0x13C878        CRC32 polynomial table, little endian
1520860       0x1734DC        SHA256 hash constants, little endian
1554511       0x17B84F        mcrypt 2.2 encrypted data, algorithm: blowfish-448, mode: CBC, keymode: 4bit
1557283       0x17C323        mcrypt 2.2 encrypted data, algorithm: blowfish-448, mode: CBC, keymode: 4bit
1564863       0x17E0BF        mcrypt 2.2 encrypted data, algorithm: blowfish-448, mode: CBC, keymode: 4bit
1600817       0x186D31        LZO compressed data
1650703       0x19300F        Intel x86 or x64 microcode, sig 0x00001001, pf_mask 0x502b301, 2000-05-14, size 1
1707524       0x1A0E04        Flattened device tree, size: 56504 bytes, version: 17
1764032       0x1AEAC0        xz compressed data
1769720       0x1B00F8        xz compressed data
1775392       0x1B1720        xz compressed data
1780912       0x1B2CB0        xz compressed data
1786416       0x1B4230        xz compressed data
7076992       0x6BFC80        xz compressed data
13978715      0xD54C5B        xz compressed data
14042526      0xD6459E        xz compressed data
14102651      0xD7307B        MySQL MISAM compressed data file Version 2
14104473      0xD73799        xz compressed data
14166680      0xD82A98        xz compressed data
14214051      0xD8E3A3        xz compressed data
14257038      0xD98B8E        xz compressed data
14286498      0xD9FEA2        xz compressed data
14346785      0xDAEA21        xz compressed data
14359004      0xDB19DC        xz compressed data
14411264      0xDBE600        xz compressed data
14464515      0xDCB603        xz compressed data
14516366      0xDD808E        xz compressed data
14561933      0xDE328D        xz compressed data
14613348      0xDEFB64        xz compressed data
14663319      0xDFBE97        xz compressed data
14718938      0xE097DA        xz compressed data
14762262      0xE14116        xz compressed data
14813397      0xE208D5        xz compressed data
14862732      0xE2C98C        xz compressed data
14893656      0xE34258        xz compressed data
14900407      0xE35CB7        xz compressed data
14956675      0xE43883        xz compressed data
14983826      0xE4A292        xz compressed data
15018210      0xE528E2        xz compressed data
15064993      0xE5DFA1        xz compressed data
15118440      0xE6B068        xz compressed data
15170007      0xE779D7        xz compressed data
15260918      0xE8DCF6        xz compressed data
15364100      0xEA7004        xz compressed data
15412355      0xEB2C83        xz compressed data
15463734      0xEBF536        xz compressed data
15512765      0xECB4BD        xz compressed data
15563881      0xED7C69        xz compressed data
15620720      0xEE5A70        xz compressed data
15705734      0xEFA686        xz compressed data
15743762      0xF03B12        xz compressed data
15759121      0xF07711        xz compressed data
15788309      0xF0E915        xz compressed data
15840456      0xF1B4C8        xz compressed data
15914679      0xF2D6B7        xz compressed data
15917807      0xF2E2EF        xz compressed data
15973910      0xF3BE16        xz compressed data
16030185      0xF499E9        xz compressed data
16037525      0xF4B695        xz compressed data
16095544      0xF59938        xz compressed data
16134511      0xF6316F        xz compressed data
16166667      0xF6AF0B        xz compressed data
16202186      0xF739CA        xz compressed data
16240313      0xF7CEB9        xz compressed data
16273893      0xF851E5        xz compressed data
16306576      0xF8D190        xz compressed data
16338156      0xF94CEC        xz compressed data
16376983      0xF9E497        xz compressed data
16389095      0xFA13E7        xz compressed data
16426158      0xFAA4AE        xz compressed data
16460830      0xFB2C1E        xz compressed data
16514361      0xFBFD39        xz compressed data
16545788      0xFC77FC        xz compressed data
16583228      0xFD0A3C        xz compressed data
16635879      0xFDD7E7        xz compressed data
16680678      0xFE86E6        xz compressed data
16705666      0xFEE882        xz compressed data
16731333      0xFF4CC5        xz compressed data
16743797      0xFF7D75        xz compressed data
16749101      0xFF922D        xz compressed data
16769077      0xFFE035        xz compressed data
55727661      0x352562D       MySQL MISAM index file Version 9
82063283      0x4E42FB3       PNG image, 1280 x 800, 8-bit/color RGBA, non-interlaced
86355981      0x525B00D       MySQL MISAM compressed data file Version 5
158502261     0x9728D75       Zlib compressed data, default compression

[dzelionis]

Intel does some proper stuff these days, had my fingers on come netwrok switch if is 1U rack mountable:

basically it has an intel cpu + motherboard as a module, wher x86 linux is spinning and you can run docker or linux kvm virtualized images with no problem, so in this particular case you could have some customer require a firewall service, so you just sping kvm image of Fortigatate + apply the license and you have it.... no need for any additional site visits or hardware installations.....its very cool....
From my experience with it, it has u-boot bootloader and i have not seen any support of fastboot....but may point it is very different from rk3288 :D

SC LIVE 4 still should have a console connection on the motherboard, easy way to get root access is to interrupt U-boot boot loader and add "single init=/bin/sh" to kernel options.....