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2. Kernel, Variant and Extensions
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3. File server and File systems
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4. System startup
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5. GUI and beyond...
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Main stages of boot for a NAND Flash phone
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allows built-in software that expects to be in ROM to be in the usual place drive Z: . Given all this extra effort and delay during startup it is worth asking, what is the value of using NAND Flash for non-volatile storage in mobile phones The answer is the same issue that prompted the question: performance. NAND Flash provides similar performance to NOR Flash for reading, but can write data three or four times faster. This will become very important for mobile phones that have multi-megapixel cameras or allow download of music tracks from a PC NOR Flash is too slow for these use cases.
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16.2.2 Other reasons for startup
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The boot process usually starts because the user switched on the mobile phone, in which case the standard startup process is likely to be followed.
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ALTERNATIVE STARTUP SCENARIOS
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However, there are circumstances in which we follow alternative boot sequences, for example: A phone that is powered off displays its charging status when plugged into an electrical supply In the factory, when it is rst switched on, the phone runs a series of diagnostic self tests to verify that the hardware and software are all functioning correctly While the phone s rmware (in other words, the Flash memory on which Symbian OS resides) is being updated, Symbian OS cannot safely be running. Depending on how the update software is implemented, this startup sequence may diverge inside the bootstrap before the kernel runs. In the majority of Symbian phones, it is not the Symbian kernel that is initially aware of the reason for boot. The bootstrap provides a little information to the kernel through the superpage in the form of iBootReason, but this usually indicates only the difference between a cold boot (hardware power on) and a warm boot (software reset and reboot). Most often, the baseband software determines the reason for booting and provides this information to Symbian OS early on for example in ESTART. The system starter uses this information to select the con guration le that corresponds to this startup scenario.
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16.2.3 Booting in the emulator
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The introduction of process emulation makes it possible for the emulator to boot in a way that is much closer to the real thing. The most signi cant differences are: 1. The object that replaces the bootstrap 2. Running different types of emulator.
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EPOC.EXE is the standard bootstrap program. It is a Win32 executable and its sole reason for existence is to call BootEpoc() in EUSER from its Win32 entry point. BootEpoc() takes a single Boolean parameter, ultimately used to determine if the emulator should automatically run a program after boot is completed. BootEpoc() loads the kernel DLL dynamically and looks up the Symbian OS entry point, _E32Startup, by name. If it is successful, this entry point is then invoked, passing in BootEpoc() s parameter. The kernel s _E32Startup() function rst runs the kernel s static data constructors, then saves the parameter for later and calls the kernel s
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BootEpoc() function. This function does emulator speci c initialization before calling the common kernel startup code in KernelMain().
22.214.171.124 Variant and extensions
With no ROM, the kernel cannot immediately nd the variant and extensions to load. The variant is always called ECUST.DLL and P::CreateVariant() dynamically loads it the DLL entrypoint is located as for other emulator DLLs, and called as normal for the variant. A::CreateVariant() then invokes the rst ordinal in the variant, passing in the previously saved parameter that was originally passed to BootEpoc() by EPOC.EXE. Variant initialization then proceeds as usual. The list of extensions to load is retrieved from the variant as the extensions property. These are dynamically loaded, in order, and their Symbian OS DLL entry points are called as normal for extensions. The last of these should be EXSTART, which creates a process based on the EFILE.EXE image the le server.