Critical corrections based on actual build test on 2026-03-01:
1. Machine: tqma6ulx-mba6ulx → tqma6ul-multi-mba6ulx
(the -multi variant is the correct one for the MBa6ULx carrier)
2. Config: imx → mainline
(TQMa6UL machines are NOT in the imx config, only in mainline)
3. Carrier: MBa6x → MBa6ULx
(MBa6x is for the Quad/Dual, MBa6ULx is for the UltraLite)
4. C library: glibc 2.38 → musl 1.2+
(BSP uses musl: TARGET_SYS=arm-tq-linux-musleabi)
5. README rewritten with verified build output
Verified: DISTRO=spaetzle 5.0.11, BB_VERSION=2.8.0
227e1f259f