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* stm32f1: stm32.h: Tweak STM32_F1_LINE_xxx for mnemonic value.Marti Bolivar2012-05-081-6/+6
| | | | | | | | | | Change the values of the STM32_F1_LINE_xxx macros to match the part number better (so performance line, or F103s, now have STM32_F1_LINE_PERFORMANCE==3, F100s have STM32_F1_LINE_VALUE==0, etc.). This will hopefully make debugging or error checking easier for someone at some point. Signed-off-by: Marti Bolivar <mbolivar@leaflabs.com>
* stm32f1: stm32.h: Doxygen.Marti Bolivar2012-05-081-5/+5
| | | | Signed-off-by: Marti Bolivar <mbolivar@leaflabs.com>
* stm32f1: stm32.h: Cosmetics.Marti Bolivar2012-05-081-4/+10
| | | | Signed-off-by: Marti Bolivar <mbolivar@leaflabs.com>
* stm32f1: stm32.h: Add Doxygen comments.Marti Bolivar2012-05-081-0/+22
| | | | Signed-off-by: Marti Bolivar <mbolivar@leaflabs.com>
* stm32f1: stm32.h: Add hooks for USB access line.Marti Bolivar2012-05-081-1/+3
| | | | | | | There are five F1 lines in total. The necessary infrastructure for USB access line (STM32F102 MCUs) support is missing, so add it. Signed-off-by: Marti Bolivar <mbolivar@leaflabs.com>
* stm32f1: stm32.h: Fix wrong comment.Marti Bolivar2012-05-081-3/+0
| | | | | | We've got some value line values now. Signed-off-by: Marti Bolivar <mbolivar@leaflabs.com>
* adc: Add missing "static" on adc_dev adc3.Marti Bolivar2012-05-061-1/+1
| | | | Signed-off-by: Marti Bolivar <mbolivar@leaflabs.com>
* stm32f1/adc.h: Add missing includes.Marti Bolivar2012-05-031-0/+2
| | | | Signed-off-by: Marti Bolivar <mbolivar@leaflabs.com>
* stm32f1/adc.c: Cosmetics.Marti Bolivar2012-05-031-4/+6
| | | | Signed-off-by: Marti Bolivar <mbolivar@leaflabs.com>
* STM32F1: adc: Tweaks for XL-density MCUs.Marti Bolivar2012-05-032-5/+3
| | | | Signed-off-by: Marti Bolivar <mbolivar@leaflabs.com>
* stm32f1: Resurrect DMA support. (sets up breaking change)Marti Bolivar2012-05-033-0/+810
| | | | | | | | | | | | | | | | | Breaking change set up: struct dma_handler_config is no longer part of the public API in <libmaple/dma.h>. User code which was touching these was always mistaken; it should be using dma_attach_interrupt() or dma_detach_interrupt() instead. Other than that, just move the nonportable bits in <libmaple/dma.h> and libmaple/dma.c to the appropriate places under libmaple/stm32f1/. (Ouch. This is almost everything.) Patch the (new) STM32F1 <series/dma.h> here and there to make everything compile; this is mostly limited to forward-declaring struct dma_dev and providing a hack _dma_dev_regs() declaration so inline functions in the series header can still access a device's registers. Signed-off-by: Marti Bolivar <mbolivar@leaflabs.com>
* STM32VLDiscovery support filesAnton Eltchaninov2012-05-031-0/+15
| | | | | Signed-off-by: Anton Eltchaninov <anton.eltchaninov@gmail.com> Signed-off-by: Marti Bolivar <mbolivar@leaflabs.com>
* stm32.h: Various updates, mostly to help STM32F1 line support.Marti Bolivar2012-04-241-31/+69
| | | | | | | | | | | | | | | | | | | | | | | | | | | Add STM32_HAVE_USB feature test macro requirement for <series/stm32.h>. This will let us test if we've got a USB peripheral. wirish/stm32f1/boards_setup.cpp is set up to use this when turning on USB CDC ACM support at init() time. Rework the STM32F1 <series/stm32.h> to make it easier to support the various lines that subdivide that series. We don't really support anything besides performance line yet, but there's been enough enthusiasm for value and connectivity line support in the past that these hooks seem worth adding. This means adding an STM32_F1_LINE macro and STM32_F1_LINE_[PERFORMANCE,VALUE,ACCESS,CONNECTIVITY] macros for values that STM32_F1_LINE can take, and generalizing the rest of the file to begin taking this into account. Some TODOs remain, but filling these in is the responsibility of future libmaple porting efforts. One pleasant consequence of the F1 stm32.h rework is that the build system no longer has to tell us what density of F103 we're building for, so remove that from the relevant support/make/board-includes/ files. Add some tweaks to <libmaple/stm32.h> and the STM32F2 stm32.h header to make sure this went through properly, and continues to go through properly in the future.
* stm32f1: stm32.h: Fix comment typo.Marti Bolivar2012-04-241-1/+1
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* stm32f1: stm32.h: Put MCU section first, allow overrides.Marti Bolivar2012-04-231-30/+47
| | | | | | | | | | Put the section defining MCU-specific values before the other sections. Surround the density-specific defines with #ifndef/#endif pairs. This allows any of the settings in the STM32F1 stm32.h to be overridden on a per-MCU basis. That's hopefully useful to e.g. people porting libmaple to STM32F100 MCUs, which have slower clocks. Signed-off-by: Marti Bolivar <mbolivar@leaflabs.com>
* libmaple/stm32f1/spi.c: cosmetics.Marti Bolivar2012-04-111-15/+16
| | | | | | Fix whitespace, move some definitions around. Signed-off-by: Marti Bolivar <mbolivar@leaflabs.com>
* libmaple/spi: Fixups, move nonportable bits into libmaple/stm32f1.Marti Bolivar2012-04-113-0/+168
| | | | | | | | | | | Standard family support refactoring: add STM32F1 series spi.h, spi.c, and move anything that won't port to STM32F2 there. As part of a general effort to be cleaner, remove the dependency on libmaple/util.h from libmaple/spi.h by not using BIT(). Also forward declare struct gpio_dev for spi_gpio_cfg() to remove that include. Signed-off-by: Marti Bolivar <mbolivar@leaflabs.com>
* STM32F1: Add support for timers 9 through 14.Marti Bolivar2012-04-112-8/+117
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This applies to XL-density STM32F1 devices. In stm32f1/timer.c, add timer_dev's for the new timers, using the timer_private API. These definitions are conditionally compiled based on the target density to avoid wasting space on smaller MCUs. Also add calls to the appropriate timer_private.h dispatch routines within the IRQ handlers for these timers. We need to change the IRQ handler names to reflect this eventually, but put that off for now, as it could break backwards compatibility in some exotic situations where the user refers to the libmaple IRQ handlers directly. In stm32f1/timer.h, add register map base pointers and device declarations for the new timers. timer_dev* declarations are compiled in only when the target MCU supports them, in keeping with the above stm32f1/timer.c changes. In libmaple/timer.c, update the (static) IRQ enable routines to account for the additional timers. This adds some code that's unnecessary on smaller STM32F1s, but it's minimal (40 extra bytes on my machine), so portability and readability win out. Size change, using GCC version "(Sourcery G++ Lite 2011.03-42) 4.5.2": Before: text data bss dec hex filename 615 0 0 615 267 build/home/mbolivar/leaf/libmaple/libmaple/timer.o After: text data bss dec hex filename 655 0 0 655 28f build/home/mbolivar/leaf/libmaple/libmaple/timer.o Signed-off-by: Marti Bolivar <mbolivar@leaflabs.com>
* stm32f1/nvic.h: Add nvic_irq_num's for XL-density timers; Doxygen fixup.Marti Bolivar2012-04-111-7/+45
| | | | | | | | | | | | | | | | | | | | | This is a backwards-compatible change, but it deprecates some existing functionality. XL density STM32F1 devices have additional timers 9 through 14. These share NVIC lines with timers 1 and 8. This scheme is also used on e.g. STM32F2, so the corresponding nvic_irq_num enumerators on that series have names like "NVIC_TIMER1_BRK_TIMER9" instead of "NVIC_TIMER1_BRK". For portability (and XL-density support), it makes sense to add these enumerators to the F1 version of nvic_irq_num, which we do here. For backwards compatibility, we keep the old enumerators (like NVIC_TIMER1_BRK) around as aliases to the new ones (like NVIC_TIMER1_BRK_TIMER9). These old enumerators are now deprecated. Also fix up the Doxygen @file header. Signed-off-by: Marti Bolivar <mbolivar@leaflabs.com>
* stm32f1/timer.h: Whitespace tweaks.Marti Bolivar2012-04-111-8/+8
| | | | Signed-off-by: Marti Bolivar <mbolivar@leaflabs.com>
* timer: Fixes, rip out nonportable bits.Marti Bolivar2012-04-113-0/+250
| | | | | | | | | | | | | | Fix copy-paste errors in, and add missing, register bit definitions. For copy-paste errors that would result in source incompatibilities with past releases, add some legacy defines. Add series header and C file for STM32F1 which fills in the missing API. Much of the F1 timer.c would be repeated on F2, so also add timer_private.h to hold these. Support for timers 9 through 14 is still missing. Signed-off-by: Marti Bolivar <mbolivar@leaflabs.com>
* Don't conditionally compile rcc_clk_id or nvic_irq_num enumerators.Marti Bolivar2012-04-112-6/+0
| | | | | | | | | | Whether or not a given peripheral is present on an F1 series MCU doesn't matter. It doesn't take up any extra space to include these enumerators, and it's convenient to have them defined so portable libmaple routines can safely refer to them. This can prevent the need for special series-specific versions of some functions. Signed-off-by: Marti Bolivar <mbolivar@leaflabs.com>
* Deprecate rcc_clk_init().Marti Bolivar2012-04-112-6/+20
| | | | | | | | | | | | This function has been with us from the earliest days of libmaple. It's showing its age, as the API it presents is tied to the STM32F1. Deprecate it, and provide instructions for how to use newer, more portable APIs. The new way is more verbose, but we can always add a portable "just set up the PLL, dammit" convenience function later (a nice candidate is to extract an interface from setup_clocks() in boards.cpp). Signed-off-by: Marti Bolivar <mbolivar@leaflabs.com>
* Resurrect ADC support.Marti Bolivar2012-04-113-1/+366
| | | | | | | | | | | | | Standard refactoring: add series headers for F1 and F2, along with series adc.c files. There are some issues relating to adc_extsel_event to hammer out later, but this will do for now. We also add some new portability interfaces to libmaple/adc.h in order for Wirish to use the same code to initialize the ADCs at init() time. As usual, F1 is untested. Signed-off-by: Marti Bolivar <mbolivar@leaflabs.com>
* Resurrect PWR support for F1 and F2.Marti Bolivar2012-04-111-0/+52
| | | | | | Just add the missing register bit definitions in new series headers. Signed-off-by: Marti Bolivar <mbolivar@leaflabs.com>
* Clean up rules.mk files.Marti Bolivar2012-04-111-4/+4
| | | | | | Alphabetize targets and remove continuation lines. Signed-off-by: Marti Bolivar <mbolivar@leaflabs.com>
* [UNTESTED] Resurrect FSMC support.Marti Bolivar2012-04-112-0/+96
| | | | | | | | | | fsmc_sram_init_gpios() is now series-specific, so move its existing implementation to the F1 backend, and add libmaple/stm32f2/fsmc.c for the F2 backend. Delete libmaple/fsmc.c; it is now empty. Signed-off-by: Marti Bolivar <mbolivar@leaflabs.com>
* stm32.h: Add STM32_HAVE_FSMC.Marti Bolivar2012-04-111-0/+2
| | | | | | | This is a feature test macro for the flexible static memory controller (FSMC) peripheral. Signed-off-by: Marti Bolivar <mbolivar@leaflabs.com>
* [FIXME] Resurrected, shinier USART support.Marti Bolivar2012-04-113-0/+247
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | FIXME: - Test F1 support - Solve problem of duplicated bytes being TXed unless delay is inserted after configuration but before first bytes are TXed. Rip out nonportable bits from top-level interfaces. The USART register maps are basically the same between F1 and F2, so leave these, but add register bit definitions which had name changes to the libmaple header to avoid needless repetition. There are also a few new bits in the F2 USART registers; add definitions for these in the F2 USART header. Add Doxygen comments for all USART bit definitions. Deprecate struct usart_dev's max_baud field. This is just bloat that doesn't bring us much real benefit. Add new series-specific USART files for F1 and F2: - libmaple/stm32f[1,2]/usart.c - libmaple/stm32f[1,2]/include/series/usart.h These are standard series-specific files, providing register map base pointers, defining devices, implementing nonportable routines, etc. We need a portable way to configure the USART GPIOs. To this end, add usart_async_gpio_cfg() to the top-level USART interface. This function is implemented in new F1 and F2 USART backends to take the appropriate action to configure the RX and TX pins for asynchronous full duplex mode. USART baud rate calculation is done differently on the different series. Keep the usart_set_baud_rate() declaration in the top-level USART header, but move the implementations into the series-specific usart.c files. In usart_set_baud_rate(), allow for deriving clock_speed automatically by letting user tell us to figure out the peripheral clock speed by mapping the device's rcc_clk_id onto an STM32_PCLK[1,2] value. This preserves flexibility for users with non-default clock configurations, but makes things easier on everyone else. Add private USART files for portable private USART routines: - libmaple/usart_private.h - libmaple/usart_private.c Signed-off-by: Marti Bolivar <mbolivar@leaflabs.com>
* rcc_reconfigure_pll(): Assert that the PLL is disabled.Marti Bolivar2012-04-111-0/+3
| | | | Signed-off-by: Marti Bolivar <mbolivar@leaflabs.com>
* RCC: Add new mechanism for configuring the main PLL.Marti Bolivar2012-04-112-0/+30
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The new style for configuring the PLL is to initialize a (series-specific) struct rcc_pll_cfg, and pass a pointer to it to rcc_configure_pll(). After that's done, you can use rcc_turn_on_clk(RCC_CLK_PLL) to turn on the main PLL, and busy-wait until rcc_is_clk_ready(RCC_CLK_PLL) is true to make sure the new configuration took effect. - libmaple/rcc.h: -- Add struct rcc_pll_cfg, which specifies a PLL configuration. This specifies a PLL source and a void pointer to series-specific PLL configuration data. -- Add rcc_configure_pll(), which takes a pointer to struct rcc_pll_cfg, and configures the main PLL. It's up to each series to define this function. - stm32f1/rcc.h: Add struct stm32f1_rcc_pll_data, to store F1-specific PLL configuration state. - stm32f1/rcc.c: Add an implementation for rcc_configure_pll(). - stm32f2/rcc.h: Add struct stm32f2_rcc_pll_data, to store F2-specific PLL configuration data. - stm32f2/rcc.c: Add an implementation for rcc_configure_pll(). Signed-off-by: Marti Bolivar <mbolivar@leaflabs.com>
* stm32f1/rcc.h: Deprecate rcc_clk_init().Marti Bolivar2012-04-111-0/+1
| | | | | | We're going to replace this with a more portable mechanism. Signed-off-by: Marti Bolivar <mbolivar@leaflabs.com>
* RCC: Clean up and sanitize interfaces across F1, F2 series.Marti Bolivar2012-04-112-19/+38
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Additions: - rcc_switch_sysclk(): For changing the clock used as SYSCLK's source. - enum rcc_clk: One for each system and secondary clock source (e.g. HSE, LSE). These are defined on a per-series basis in each of the <series/rcc.h>. - rcc_turn_on_clk(), rcc_turn_off_clk(), rcc_is_clk_ready(): For turning on system and secondary clock sources, and checking whether or not they're ready. Uses enum rcc_clk. Removals: - rcc_clk_init(): There's no way to port this to F2. Move it to the F1 header. This also means we can remove the empty implementation and enum rcc_pll_multiplier from the F2 RCC header, where it doesn't make any sense. Also fix up some includes, and rewrite rcc_clk_init() in terms of the new clock source management functions. Signed-off-by: Marti Bolivar <mbolivar@leaflabs.com>
* Clean up Flash interface; add flash_enable_features().Marti Bolivar2012-04-113-42/+8
| | | | | | | | | | | | | | | | Make a single function, flash_enable_features(), to control the access characteristics of Flash memory (i.e. to write to the non-latency bits of ACR). In so doing, make everybody pretend to allow instruction and data caching. On STM32F1, trying to turn these on simply has no effect. This allows unconditionally trying to turn them on, which will simplify users' lives. This has the ancillary benefit of making the stm32f2- and stm32f1-specific flash.c files unnecessary; delete these. Signed-off-by: Marti Bolivar <mbolivar@leaflabs.com>
* Make BKP support STM32F1-only.Marti Bolivar2012-04-112-0/+130
| | | | | | | | | - libmaple/bkp.h: Mark availability restriction. - Move libmaple/bkp.c to libmaple/stm32f1; adjust rules.mk files accordingly. Signed-off-by: Marti Bolivar <mbolivar@leaflabs.com>
* libmaple/stm32: Add enum stm32_series, STM32_MCU_SERIES.Marti Bolivar2012-04-111-1/+3
| | | | | | | | | | enum stm32_series gives a tag to each STM32 series, including the ones we don't yet support. STM32_MCU_SERIES is a define which the series stm32.h header must provide, identifying the series of the MCU being targeted. Signed-off-by: Marti Bolivar <mbolivar@leaflabs.com>
* Great renaming: use "series" instead of "family".Marti Bolivar2012-04-115-3/+3
| | | | | | | | | | | | | | | | | This is for greater consistency with the ST application notes, which refer to migrating "across" series (e.g. F1 to F2), but compatibility "within" a family (e.g. F1). So: - Move libmaple/stm32x/include/family to .../include/series/ and fix up includes appropriately. - Refer to "family" headers as "series" headers in comments. - Make similar "find and replace"-style changes to build system variable names and comments. - Move support/ld/stm32/family to .../stm32/series. Signed-off-by: Marti Bolivar <mbolivar@leaflabs.com>
* libmaple/flash: Add family-specific FLASH_SAFE_WAIT_STATES.Marti Bolivar2012-04-111-1/+8
| | | | | | | | | | | | This is the smallest wait state value that is safe for use when the MCU is at its fastest rate, not considering overclocking. This requires moving the FLASH_WAIT_STATE defines above the family include, so do that, and add the missing #defines (for wait states up to 7). For the STM32F1, the correct value for FLASH_SAFE_WAIT_STATES is FLASH_WAIT_STATE_2; say so in the F1-family flash.h. Signed-off-by: Marti Bolivar <mbolivar@leaflabs.com>
* Move nonportable bits of libmaple/stm32.h into libmaple/stm32f1.Marti Bolivar2012-04-111-0/+100
| | | | | | | | These go in a new family header, libmaple/stm32f1/include/family/stm32.h. While we're at it, do some reorganizing. Signed-off-by: Marti Bolivar <mbolivar@leaflabs.com>
* stm32f1: License headers, portability markers.Marti Bolivar2012-04-112-2/+54
| | | | | | | | | Add license headers to libmaple/stm32f1/isrs_performance.S and libmaple/stm32f1/vector_table_performance.S. Copyright to Perry Hung. I was present when Perry wrote these files. Also mark these as STM32F1 specific (rather than "STM32", say "STM32F1"). Signed-off-by: Marti Bolivar <mbolivar@leaflabs.com>
* stm32f1/rcc.c: Add cautionary comment.Marti Bolivar2012-04-111-0/+4
| | | | Signed-off-by: Marti Bolivar <mbolivar@leaflabs.com>
* RCC: Break out some portable functionality from stm32f1/.Marti Bolivar2012-04-111-34/+7
| | | | | | | | | | | | | Portions of rcc_clk_enable(), rcc_reset_dev(), and rcc_set_prescaler() are portable; break these into static inline helpers in rcc_private.h. These guts of these are portable, but the arrays of registers etc. are not. Also add an extern declaration for rcc_dev_table into rcc_private.h. This lets us put rcc_dev_clk() into a newly resurrected libmaple/rcc.c, since that's portable. Signed-off-by: Marti Bolivar <mbolivar@leaflabs.com>
* libmaple: Add build infrastructure for private headers.Marti Bolivar2012-04-111-1/+1
| | | | | | | | | | | libmaple/rules.mk: Add LIBMAPLE_PRIVATE_INCLUDES, a place for storing headers which should be commonly available throughout libmaple, but not made public. Currently, this is just the libmaple directory. Add LIBMAPLE_PRIVATE_INCLUDES to the target flags in the STM32F1 and USB submodules. Signed-off-by: Marti Bolivar <mbolivar@leaflabs.com>
* Move GPIO support for STM32F1 to libmaple/stm32f1.Marti Bolivar2012-04-113-0/+664
| | | | | | | | | | | | | | | Make a new family header, libmaple/stm32f1/include/family/gpio.h, and supporting libmaple/stm32f1/gpio.c. Beyond registers and devices, these also include anything mentioning AFIO, which doesn't exist on F2. Update libmaple/stm32f1/rules.mk for new gpio.c. Alter gpio_write_bit() to use dev->regs->BSRR only. BRRs are not present on STM32F2. Signed-off-by: Marti Bolivar <mbolivar@leaflabs.com>
* Move NVIC support for STM32F1 to libmaple/stm32f1.Marti Bolivar2012-04-111-0/+139
| | | | | | Backwards-compatible. Only the headers need to change. Signed-off-by: Marti Bolivar <mbolivar@leaflabs.com>
* Move Flash support for STM32F1 to libmaple/stm32f1/.Marti Bolivar2012-04-113-0/+178
| | | | | | | | | | | | | | | This is a backwards-compatible change. The Flash registers on the STM32F2 line are different than on STM32F1. Therefore, move the register map and bit definitions to new libmaple/stm32f1/include/family/flash.h. Move flash_enable_prefetch() from libmaple/flash.c to new libmaple/stm32f1/flash.c. The remaining pieces of libmaple/flash.c use a common subset of the Flash registers, so they're's portable to F2, and that's all we're currently interested in. Signed-off-by: Marti Bolivar <mbolivar@leaflabs.com>
* Move RCC support for STM32F1 to libmaple/stm32f1/.Marti Bolivar2012-04-113-1/+766
| | | | | | | | | | | | This is a backwards-compatible change. Modify libmaple/rules.mk to include the family's include directory. This allows libmaple/include/libmaple/rcc.h to include the STM32F1 RCC header with #include <family/rcc.h>. We'll use this convention henceforth to distinguish between top-level and family-specific headers. Signed-off-by: Marti Bolivar <mbolivar@leaflabs.com>
* Remove "CS3" prefix from libmaple symbol names.Marti Bolivar2012-04-111-6/+6
| | | | | | | | | | | | | | | | | | | We're no longer even marginally compatible with CS3, so it's inappropriate to use that prefix in our names. Rename: __cs3_stm32_vector_table -> __stm32_vector_table. __cs3_stack -> __msp_init __cs3_reset -> __exc_reset __cs3_start_c -> start_c Also add an MIT license header and assert LeafLabs copyright over wirish/start.S and wirish/start_c.c. These files are modified from the original CodeSourcery versions, which were distributed under a license that permits modifications to be distributed under a different copyright and licensing terms than the originals. Signed-off-by: Marti Bolivar <mbolivar@leaflabs.com>
* Remove CS3-style initialization.Marti Bolivar2012-04-113-0/+348
Remove libcs3-related bits from support/ld. Break them out into libmaple proper and Wirish as appropriate: vector table definition and ISR declarations go into libmaple proper, and startup code goes into Wirish. Vector table symbols are included into common.inc from an STM32 family-specific directory under support/ld/stm32. This is a combination of 5 commits. Individual commit messages follow: libcs3_stm32_src: Don't depend on cs3.h. So we can use the existing toolchain. Move ISR decls/vector table into libmaple proper. This allows us to configure the vector table on a per-family basis. - Move support/ld/libcs3_stm32_src/stm32_isrs.S stm32_vector_table.S to libmaple/stm32f1/isrs_performance.S vector_table_performance.S, respectively. The directory libmaple/stm32f1/ is intended to hold all STM32F1-specific code within libmaple. Obviously, there's a lot of work to do before this becomes true. - support/ld/libcs3_stm32_src/Makefile: Don't try to compile stm32_isrs.S and stm32_vector_table.S anymore. - Add libmaple/stm32f1/rules.mk to include these new files in the standard libmaple build. - support/make/target-config.mk: Add LIBMAPLE_MODULE_FAMILY, which selects a directory to use as a family-specific libmaple submodule. - Makefile: Add LIBMAPLE_MODULE_FAMILY to LIBMAPLE_MODULES. Remove support/ld/libcs3_stm32_src and derived object files. From support/ld/libcs3_stm32_src, move start.S and start_c.c into Wirish. Modify wirish/rules.mk accordingly. Delete support/ld/libcs3_stm32_*_density.a. These are no longer necessary, as the relevant objects are included in the standard Wirish build. Remove the GROUP statements from the board linker scripts accordingly. Remove SEARCH_DIR(.) from common.inc; it's no longer necessary. Also fix up some comments that are now out of date. wirish/start_c.c: Don't use CS3-style memory initialization. Switch memory initialization to a simpler style of initializing .data if necessary, then zeroing .bss. Initializing .data is only necessary during Flash builds, since during RAM builds, LOADADDR(.data) == ADDR(.data). This makes libmaple completely incompatible with the CS3 startup sequence. Subsequent commits will clean up the namespace to reflect that fact. Signed-off-by: Marti Bolivar <mbolivar@leaflabs.com>
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