33c3: add Linux kernel / system level slides + diagram
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@ -207,35 +207,79 @@ image:images/legato_flash.png[width="80%"]
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// Show it is a highly complex SoC... with even more things
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// that are unknown.. device tree file, periperhal, etc
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== MDM SW Overview
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== MDM 9615 AP SW Overview
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image:images/gandroid_logo.png[height=200,role="gimmick_right"]
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* GNU libc, busybox userland
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* Android Debug Bridge (adb)
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* Android Linux kernel
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The software stack seems to be called *Qualcomm LE*
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* Android Bootloader
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* Android Linux kernel
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* Android Debug Bridge (adb)
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* but: GNU libc, busybox userland
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* Using OpenEmbedded to build images
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* Developed and maintained by Qualcomm
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== Linux kernel overview
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== Qualcomm Linux kernel overview
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* Qualcomm Android Linux kernel
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* Huge changes compared to mainline
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* CPU and peripheral support
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* <List frameworks here>
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* Huge changes compared to mainline `git diff -w | wc -l`
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** `v3.0.21` in EC20: 1.5 million lines
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** `v3.18.20` in EC25: 1.9 million lines
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* Expected: CPU + peripheral drivers
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* Less expected:
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** smem_log, ipc_log, remote spinlocks, etc.
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== ...
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== Qualcomm Linux kernel subsystems
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[cols="20%,80%"]
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|===
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|SMD|Shared Memory Device
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|IPC|Inter Processor Communications
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|RMNET|Remote Network
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|BAM|Bus Access Manager
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|IPA|Internet Packet Accelerator
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|DIAGFWD|DIAG Forwarding
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|===
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== Qualcomm LE System Architecture
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image:images/qualcomm_le.svg[width="50%",role="gimmick_right"]
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* simplified block diagram
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* USB interface fully controlled by Linux AP
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** very complex Qualcomm Android USB Gadget
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** some endpoints mapped to SMD queues
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** other endpoints handled by _regular_ Linux
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** GPS NMEA takes completely different path than AT commands, despite
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both being serial ports?
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** DIAG and QMI handled in more complex ways
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== DIAG in Qualcomm LE
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* DIAG interface of Modem exposed on SMD
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* diagfwd distributes messages between USB, SMD and `/dev/diagchar`
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* Linux userspace processes don't use syslog, but diag msg for logging via `libdiag.so`
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image:images/diag.svg[width="100%"]
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== QMI in Qualcomm LE
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every `rmnet` data device has associated QMI control
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* on your Linux PC: `qmi_wwan` and `/dev/cdc-wdm`
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* on Qualcomm LE modem: `/dev/smdcntlN`, multiplexed by `qmuxd`
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image:images/qmi_smd_qmuxd.svg[width="100%"]
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== Funny commands
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* AT+QLINUXCMD, e.g. switch usb config to get adb
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* AT+QFASTBOOT, switch to the bootloader
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* AT+QPRINT, print dmesg
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* AT for system("echo mem > /sys/power/state")
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* `AT+QLINUXCMD`, e.g. switch usb config to get adb
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** arbitrary shell commands executed as root on r/w rootfs!
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* `AT+QFASTBOOT`, switch to the bootloader
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* `AT+QPRINT`, print dmesg
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* AT for `system("echo mem > /sys/power/state")`
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@ -3,9 +3,9 @@ digraph G {
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graph [ dpi = 50 ];
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rankdir = RL;
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MDSP[ label = "Modem DSP" ];
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MDSP [ label = "Modem DSP" ];
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SMD [ label = "Shared Memory Devices" ];
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SMD
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diagfwd
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f_diag
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USB
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@ -21,8 +21,8 @@ digraph G {
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subgraph cluster_userspace {
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label = "Linux Userspace"
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qmuxd -> diagchar [ label = "/dev/diag" ];
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atfwd_daemon -> qmuxd [ label = "/dev/diagt" ]
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QCMAP -> qmuxd [ label = "/dev/diagt" ]
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atfwd_daemon -> qmuxd [ label = "/dev/diag" ]
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QCMAP -> qmuxd [ label = "/dev/diag" ]
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quectel_daemon -> qmuxd [ label = "/dev/diag" ]
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}
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Host -> USB
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@ -9,9 +9,9 @@
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width="210mm"
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height="297mm"
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viewBox="0 0 744.09448819 1052.3622047"
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width="156.46683mm"
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height="180.56444mm"
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Reference in New Issue