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-rw-r--r--2016/33c3/33c3-modems.adoc72
-rw-r--r--2016/33c3/images/diag.dot8
-rw-r--r--2016/33c3/images/qualcomm_le.svg394
3 files changed, 202 insertions, 272 deletions
diff --git a/2016/33c3/33c3-modems.adoc b/2016/33c3/33c3-modems.adoc
index dc4070d..815ec96 100644
--- a/2016/33c3/33c3-modems.adoc
+++ b/2016/33c3/33c3-modems.adoc
@@ -207,35 +207,79 @@ image:images/legato_flash.png[width="80%"]
// Show it is a highly complex SoC... with even more things
// that are unknown.. device tree file, periperhal, etc
-== MDM SW Overview
+== MDM 9615 AP SW Overview
image:images/gandroid_logo.png[height=200,role="gimmick_right"]
-* GNU libc, busybox userland
-* Android Debug Bridge (adb)
-* Android Linux kernel
+The software stack seems to be called *Qualcomm LE*
+
* Android Bootloader
+* Android Linux kernel
+* Android Debug Bridge (adb)
+* but: GNU libc, busybox userland
* Using OpenEmbedded to build images
* Developed and maintained by Qualcomm
+== Qualcomm Linux kernel overview
+
+* Qualcomm Android Linux kernel
+* Huge changes compared to mainline `git diff -w | wc -l`
+** `v3.0.21` in EC20: 1.5 million lines
+** `v3.18.20` in EC25: 1.9 million lines
+* Expected: CPU + peripheral drivers
+* Less expected:
+** smem_log, ipc_log, remote spinlocks, etc.
+== Qualcomm Linux kernel subsystems
-== Linux kernel overview
+[cols="20%,80%"]
+|===
+|SMD|Shared Memory Device
+|IPC|Inter Processor Communications
+|RMNET|Remote Network
+|BAM|Bus Access Manager
+|IPA|Internet Packet Accelerator
+|DIAGFWD|DIAG Forwarding
+|===
-* Qualcomm Android Linux kernel
-* Huge changes compared to mainline
-* CPU and peripheral support
-* <List frameworks here>
+== Qualcomm LE System Architecture
+
+image:images/qualcomm_le.svg[width="50%",role="gimmick_right"]
+
+* simplified block diagram
+* USB interface fully controlled by Linux AP
+** very complex Qualcomm Android USB Gadget
+** some endpoints mapped to SMD queues
+** other endpoints handled by _regular_ Linux
+** GPS NMEA takes completely different path than AT commands, despite
+both being serial ports?
+** DIAG and QMI handled in more complex ways
+
+== DIAG in Qualcomm LE
+
+* DIAG interface of Modem exposed on SMD
+* diagfwd distributes messages between USB, SMD and `/dev/diagchar`
+* Linux userspace processes don't use syslog, but diag msg for logging via `libdiag.so`
+
+image:images/diag.svg[width="100%"]
+
+== QMI in Qualcomm LE
+
+every `rmnet` data device has associated QMI control
+
+* on your Linux PC: `qmi_wwan` and `/dev/cdc-wdm`
+* on Qualcomm LE modem: `/dev/smdcntlN`, multiplexed by `qmuxd`
-== ...
+image:images/qmi_smd_qmuxd.svg[width="100%"]
== Funny commands
-* AT+QLINUXCMD, e.g. switch usb config to get adb
-* AT+QFASTBOOT, switch to the bootloader
-* AT+QPRINT, print dmesg
-* AT for system("echo mem > /sys/power/state")
+* `AT+QLINUXCMD`, e.g. switch usb config to get adb
+** arbitrary shell commands executed as root on r/w rootfs!
+* `AT+QFASTBOOT`, switch to the bootloader
+* `AT+QPRINT`, print dmesg
+* AT for `system("echo mem > /sys/power/state")`
diff --git a/2016/33c3/images/diag.dot b/2016/33c3/images/diag.dot
index 66dcec8..4114e52 100644
--- a/2016/33c3/images/diag.dot
+++ b/2016/33c3/images/diag.dot
@@ -3,9 +3,9 @@ digraph G {
graph [ dpi = 50 ];
rankdir = RL;
- MDSP[ label = "Modem DSP" ];
+ MDSP [ label = "Modem DSP" ];
- SMD [ label = "Shared Memory Devices" ];
+ SMD
diagfwd
f_diag
USB
@@ -21,8 +21,8 @@ digraph G {
subgraph cluster_userspace {
label = "Linux Userspace"
qmuxd -> diagchar [ label = "/dev/diag" ];
- atfwd_daemon -> qmuxd [ label = "/dev/diagt" ]
- QCMAP -> qmuxd [ label = "/dev/diagt" ]
+ atfwd_daemon -> qmuxd [ label = "/dev/diag" ]
+ QCMAP -> qmuxd [ label = "/dev/diag" ]
quectel_daemon -> qmuxd [ label = "/dev/diag" ]
}
Host -> USB
diff --git a/2016/33c3/images/qualcomm_le.svg b/2016/33c3/images/qualcomm_le.svg
index 051cd7a..a1c76ba 100644
--- a/2016/33c3/images/qualcomm_le.svg
+++ b/2016/33c3/images/qualcomm_le.svg
@@ -9,9 +9,9 @@
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- height="297mm"
- viewBox="0 0 744.09448819 1052.3622047"
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+ height="180.56444mm"
+ viewBox="0 0 554.41002 639.79525"
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personal git repositories of Harald Welte. Your mileage may vary