add some rough directions on how to buld a Mobian image

README.md

@@ -132,3 +132,51 @@ To Do:
 - Push changes for Mobian recipes to git
 - Add droid-juicer config
 - Amend qcom-phone-utils package (initramfs hooks, perhaps more)
+
+## Building the Kernel .deb
+
+```
+make defconfig pdx213_defconfig usb-gadget-network.config
+make -j`nproc` bindeb-pkg
+```
+
+## Obtaining firmware files
+
+This should normally happen automatically using `droid-juicer` on first boot, however, as UFS is not supported yet, we have to boot a working system and obtain the files manually for now.
+
+Easiest way to do that is to use SailfishOS. The licence is not required, the trial image works just fine.
+
+Firmware files can be obtained from the partitions `modem`, `vendor`, `bluetooth`...
+
+Recommendation:
+
+- dump partitions to `.img` files
+- mount `.img` files and extract files
+- use pil-squasher to get the files into the right format the kernel expects
+
+## Building the Image
+
+Clone my fork of mobian-recipes (temporary fork, will integrate changes once I get to it...)
+
+```
+git clone https://salsa.debian.org/erebion/mobian-recipes
+git checkout wip/erebion/add-pdx213
+```
+
+Place kernel .deb at `devices/qcom/packages/`
+
+Put firmware files into `devices/qcom/firmware/`, this currently what I have in there:
+
+```
+a615_zap.mbn  adsp.b03  adsp.b08  adsp.b14  adsp.b19  adsp.b24  adsp.b29  adsp.mbn      apbtfw11.tlv  crbtfw20.tlv  crnv21.bin   modem.mbn          wlanmdsp.mbn
+a619_gmu.bin  adsp.b04  adsp.b09  adsp.b15  adsp.b20  adsp.b25  adsp.b30  adspr.jsn     apnv10.bin    crbtfw21.tlv  crnv32.bin   modemst1.img
+adsp.b00      adsp.b05  adsp.b10  adsp.b16  adsp.b21  adsp.b26  adsp.b31  adsps.jsn     apnv11.bin    crbtfw32.tlv  crnv32u.bin  modemst2.img
+adsp.b01      adsp.b06  adsp.b12  adsp.b17  adsp.b22  adsp.b27  adsp.b32  adspua.jsn    cdsp.mbn      crnv11.bin    egista.mbn   qcom_firmware_tmp
+adsp.b02      adsp.b07  adsp.b13  adsp.b18  adsp.b23  adsp.b28  adsp.b33  apbtfw10.tlv  crbtfw11.tlv  crnv20.bin    ipa_fws.mbn  venus.mbn
+```
+
+Build image:
+
+```
+sudo ./build.sh -t qcom-wip -s -u mobian -p 1234 | tee mobian-build.log
+```