FreeCalypso > hg > freecalypso-sw
view doc/Firmware_Status @ 1008:5f919af515f1
rvinterf: beginning of support for new TCH and KEEPALIVE RVTMUX channels
author | Mychaela Falconia <falcon@ivan.Harhan.ORG> |
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date | Sun, 20 Mar 2016 19:59:19 +0000 |
parents | 0ee75fdf082f |
children | e1d670ec6012 |
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The goal of the gcc-built Calypso GSM firmware project contained in the gsm-fw directory of this source tree is to replace the Windows-built firmwares which have been produced in other subprojects under the FreeCalypso umbrella - see leo2moko and tcs211-c139. Our leo2moko project has produced a production quality modem fw image for the Openmoko GTA02, while a C139 reflashed with tcs211-c139 is the first dumbphone in history that can still function as an untethered phone after having had its fw replaced with an indie one that bears no relation to the manufacturer's original - but those TCS211-based Windows-built projects have severe limitations. Much of the firmware code base in those versions is in the form of unmodifiable binary object libraries, and the Windows-based configuration and build system is incompatible with the long-term needs of FreeCalypso development. The present FreeCalypso GSM fw project seeks to rectify the situation by replacing the blob-laden, Windows-built firmware with a version that is built from full source (no binary blobs) with gcc, with an entirely different configuration mechanism that actually suits our needs. Because one of the key goals of this project is to build the firmware from *full source*, the binary object versions of L1 (GSM Layer 1) and G23M (layers 2&3 of the protocol stack) featured in our reference TCS211 fw could not be reused. Instead this project uses versions of L1 and G23M (and some other pieces) that have been lifted from the firmware for TI's other chipset (LoCosto) and backported to Calypso. The current state of the project is that we have made remarkable progress, but are unfortunately nowhere near the goal of actually being able to replace TCS211 for practical use. Specifically: * Only the bare minimal modem functionality for the voice+SMS subset has been integrated so far. "Modem" means our fw can only be controlled via AT commands; no UI code (as in LCD+keypad) has been integrated at all. But it is not a true modem either as none of the data functions have been integrated yet: no CSD, no fax, no GPRS. Thus it is an AT-command-controlled voice+SMS pseudo-modem. * The firmware can be built for the following targets: Mot C11x/12x Mot C139/140 Mot C155/156 Openmoko GTA01/02 Pirelli DP-L10 All configurations are built from the same source tree. The firmware functions identically on all supported targets. Because there is no UI code integrated yet, the LCD stays dark and the buttons do nothing on those target devices that have such hardware. * Most of our supported target devices have only one practically accessible serial port (UART). Our firmware presents TI's RVTMUX interface on this UART; the operator is expected to interface to it by running our rvinterf tools on the host PC/laptop. One of the utilities in the rvinterf suite is fc-shell; this tool is used to send AT commands to the running firmware, which is the only way to control its operation. * With a valid SIM card inserted and a valid IMEISV configured, a GSM device running our firmware can successfully connect to live commercial GSM networks and send and receive SMS. * Voice calls are broken: using appropriate AT commands, one can dial outgoing calls and answer incoming ones, and they connect as they should. However, the voice audio path is broken: nothing but noise is heard in the earpiece speaker. We reason that the problem must be somewhere in L1, which has been backported from LoCosto to Calypso in a rather Frankensteinian manner. * Deep sleep is broken and needs to be disabled with AT%SLEEP=2; the breakage is likewise assumed to be somewhere in L1. The two current points of breakage in L1 (broken deep sleep and broken voice calls) are deemed to be show-stoppers, i.e., we are not going to progress this work in any other direction until these two are fixed. And we currently see only two possible ways to fix these L1 issues: Option 1: find and obtain another copy of TCS211 that has its L1 component in source form, or a separate L1-by-itself source that would be compatible with Calypso DSP ROM 3606 and with the TCS211 fw architecture. Option 2: painstakingly reconstruct a TCS211-fitting version of L1 from the disassembly of the available binary objects, by taking LoCosto L1 sources and massaging them until they compile into object code that matches our TCS211 reference. Option 1 involves more prayer than actionable work, while Option 2 is currently being worked on in another subproject of FreeCalypso - see tcs211-l1-reconst. Target-specific usage instructions ================================== If you would like to play with our work-in-progress firmware and check it out for yourself, see the following target-specific instructions: Mot C1xx (Compal) FC-on-Compal Openmoko GTA01/02 Freerunner-Howto Pirelli DP-L10 Pirelli-Howto