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* arm:board:h2200: Add CONFIG_SYS_GENERIC_BOARDŁukasz Dałek2014-07-05-0/+1
| | | | | | | Enable 'generic board init' for H2200 palmtop. Signed-off-by: Lukasz Dalek <luk0104@gmail.com> Acked-by: Marek Vasut <marex@denx.de>
* socfpga: Adding Scan Manager driverChin Liang See2014-07-05-0/+1
| | | | | | | | | | | | Scan Manager driver will be called to configure the IOCSR scan chain. This configuration will setup the IO buffer settings Signed-off-by: Chin Liang See <clsee@altera.com> Cc: Dinh Nguyen <dinguyen@altera.com> Cc: Wolfgang Denk <wd@denx.de> CC: Pavel Machek <pavel@denx.de> Cc: Tom Rini <trini@ti.com> Cc: Albert Aribaud <albert.u.boot@aribaud.net>
* socfpga: Adding DesignWare watchdog supportChin Liang See2014-07-05-0/+14
| | | | | | | | | | | To enable the DesignWare watchdog support at SOCFPGA Cyclone V dev kit. Signed-off-by: Chin Liang See <clsee@altera.com> Cc: Anatolij Gustschin <agust@denx.de> Cc: Albert Aribaud <albert.u.boot@aribaud.net> Cc: Heiko Schocher <hs@denx.de> Cc: Tom Rini <trini@ti.com>
* arm: ep9315: Return back Cirrus Logic EDB9315A board supportSergey Kostanbaev2014-07-04-0/+292
| | | | | | | This patch returns back support for old ep93xx processors family Signed-off-by: Sergey Kostanbaev <sergey.kostanbaev@gmail.com> Cc: albert.u.boot@aribaud.net
* ARMv8/ls2085a_emu: Add LS2085A emulator and simulator board supportYork Sun2014-07-04-0/+261
| | | | | | | | | | | | | | | | LS2085A is an ARMv8 implementation. This adds board support for emulator and simulator: Two DDR controllers UART2 is used as the console IFC timing is tightened for speedy booting Support DDR3 and DDR4 as separated targets Management Complex (MC) is enabled Support for GIC 500 (based on GICv3 arch) Signed-off-by: York Sun <yorksun@freescale.com> Signed-off-by: Arnab Basu <arnab.basu@freescale.com> Signed-off-by: J. German Rivera <German.Rivera@freescale.com> Signed-off-by: Bhupesh Sharma <bhupesh.sharma@freescale.com>
* armv8/fsl-lsch3: Add support to load and start MC FirmwareJ. German Rivera2014-07-03-3/+70
| | | | | | | | | | | | | | | | Adding support to load and start the Layerscape Management Complex (MC) firmware. First, the MC GCR register is set to 0 to reset all cores. MC firmware and DPL images are copied from their location in NOR flash to DDR. MC registers are updated with the location of these images. Deasserting the reset bit of MC GCR register releases core 0 to run. Core 1 will be released by MC firmware. Stop bits are not touched for this step. U-boot waits for MC until it boots up. In case of a failure, device tree is updated accordingly. The MC firmware image uses FIT format. Signed-off-by: J. German Rivera <German.Rivera@freescale.com> Signed-off-by: York Sun <yorksun@freescale.com> Signed-off-by: Lijun Pan <Lijun.Pan@freescale.com> Signed-off-by: Shruti Kanetkar <Shruti@Freescale.com>
* ARMv8/FSL_LSCH3: Add FSL_LSCH3 SoCYork Sun2014-07-03-3/+2
| | | | | | | | | | | | | | Freescale LayerScape with Chassis Generation 3 is a set of SoCs with ARMv8 cores and 3rd generation of Chassis. We use different MMU setup to support memory map and cache attribute for these SoCs. MMU and cache are enabled very early to bootst performance, especially for early development on emulators. After u-boot relocates to DDR, a new MMU table with QBMan cache access is created in DDR. SMMU pagesize is set in SMMU_sACR register. Both DDR3 and DDR4 are supported. Signed-off-by: York Sun <yorksun@freescale.com> Signed-off-by: Varun Sethi <Varun.Sethi@freescale.com> Signed-off-by: Arnab Basu <arnab.basu@freescale.com>
* arm: Add support for semihosting for armv8 fastmodel targets.Darwin Rambo2014-07-03-7/+56
| | | | | | | | | | | | | | | | | | | | | | The armv8 ARM Trusted Firmware (ATF) can be used to load various ATF images and u-boot, and does this for virtual platforms by using semihosting. This commit extends this idea by allowing u-boot to also use semihosting to load the kernel/ramdisk/dtb. This eliminates the need for a bootwrapper and produces a more realistic boot sequence with virtual models. Though the semihosting code is quite generic, support for armv7 in fastmodel is less useful due to the wide range of available silicon and the lack of a free armv7 fastmodel, so this change contains an untested armv7 placeholder for the service trap opcode. Please refer to doc/README.semihosting for a more detailed description of semihosting and how it is used with the armv8 virtual platforms. Signed-off-by: Darwin Rambo <drambo@broadcom.com> Cc: trini@ti.com Cc: fenghua@phytium.com.cn Cc: bhupesh.sharma@freescale.com
* Merge remote-tracking branch 'u-boot-samsung/master'Albert ARIBAUD2014-07-01-54/+119
|\ | | | | | | | | | | | | | | Conflicts: boards.cfg Conflict was trivial between goni maintainer change and lager_nor removal.
| * Exynos: Split 5250 and 5420 memory bank configurationMichael Pratt2014-06-23-2/+9
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Since snow has a different memory configuration than peach, split the configuration between the 5250 and 5420. Exynos 5420 supports runtime memory configuration detection, and can make the determination between 4 and 7 banks at runtime. Include the bank size with the number of banks for context to make the number of banks meaningful. Signed-off-by: Michael Pratt <mpratt@chromium.org> Signed-off-by: Akshay Saraswat <akshay.s@samsung.com> Acked-by: Simon Glass <sjg@chromium.org> Tested-by: Simon Glass <sjg@chromium.org> Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>
| * Exynos5: Config: Enable USB boot mode for all Exynos5 SoCsAkshay Saraswat2014-06-23-6/+6
| | | | | | | | | | | | | | | | | | | | | | Right now USB booting is enabled for Exynos5250 only. Moving all the configs for USB boot mode from exynos5250-dt.h to exynos5-dt.h in order to enableUSB booting for all Exynos5 SoCs. Signed-off-by: Akshay Saraswat <akshay.s@samsung.com> Acked-by: Simon Glass <sjg@chromium.org> Tested-by: Simon Glass <sjg@chromium.org> Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>
| * Exynos5: Config: Increase SPL footprint for Exynos5420Akshay Saraswat2014-06-23-2/+4
| | | | | | | | | | | | | | | | | | | | | | | | | | Max footprint for SPL in both Exynos 5250 and 5420 is limited to 14 KB. For Exynos5250 we need to keep it 14 KB because BL1 supports only fixed size SPL downloading. But in case of Exynos5420 we need not restrict it to 14 KB. And also, the SPL size for Exynos5420 is expected to increase with the upcoming patches and the patches under review right now. Signed-off-by: Akshay Saraswat <akshay.s@samsung.com> Acked-by: Simon Glass <sjg@chromium.org> Tested-by: Simon Glass <sjg@chromium.org> Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>
| * Exynos5: Config: Place environment at the end of SPI flashAkshay Saraswat2014-06-23-1/+4
| | | | | | | | | | | | | | | | | | | | | | | | | | Currently environment resides at the location where BL2 ends. This may hold good in case there is an empty space at this position. But what if this place already has a binary or is expected to have one. To avoid such scenarios it is better to save environment at the end of the flash. Signed-off-by: Akshay Saraswat <akshay.s@samsung.com> Acked-by: Simon Glass <sjg@chromium.org> Tested-by: Simon Glass <sjg@chromium.org> Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>
| * Exynos5420: Introduce support for the Peach-Pit boardAkshay Saraswat2014-06-23-40/+80
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | While the Exynos5420 chip is used in both Smdk5420 and in the Peach-Pit line of devices, there could be other boards using the same chip, so a common configuration file is being added (exynos5420.h) as well as two common device tree files (exynos54xx.dtsi & exynos5420.dtsi). The peach board as declared in boards.cfg is a copy of smdk5420 declaration. The configuration files are similar, but define different default device trees, console serial ports and prompts. The device tree files for smdk5420 and peach-pit inherit from the same common file. Signed-off-by: Vadim Bendebury <vbendeb@chromium.org> Signed-off-by: Akshay Saraswat <akshay.s@samsung.com> Acked-by: Simon Glass <sjg@chromium.org> Tested-by: Simon Glass <sjg@chromium.org> Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>
| * Arndale: Enable preboot supportTushar Behera2014-06-18-0/+2
| | | | | | | | | | | | | | | | We need to run 'usb start' as preboot command so that ethernet comes up during u-boot prompt. Signed-off-by: Tushar Behera <tushar.b@samsung.com> Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>
| * FIX: config: goni: Change goni configuration to store envs at eMMCŁukasz Majewski2014-06-18-3/+6
| | | | | | | | | | | | | | | | Up till now goni's configuration has been stored at OneNAND. Since u-boot itself is now stored at eMMC it is more handy to store envs there as well. Signed-off-by: Lukasz Majewski <l.majewski@samsung.com> Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>
| * FIX: config: goni: Change goni configuration to use Tizen's THOR downlodaderŁukasz Majewski2014-06-16-0/+8
| | | | | | | | | | | | | | Modify GONI's configuration to utilize THOR downloader. Signed-off-by: Lukasz Majewski <l.majewski@samsung.com> Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>
* | Merge branch 'u-boot-tegra/master' into 'u-boot-arm/master'Albert ARIBAUD2014-07-01-5/+6
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| * | ARM: tegra: set initrd_high so boot scripts workStephen Warren2014-06-19-0/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | During bootm/z, U-Boot relocates the DTB and initrd to high memory so they are out of the way of the kernel. On ARM at least, some parts of high memory are "highmem" and can't be accessed at early boot. To solve this, we need to restrict this relocation process to use lower parts of RAM that area accessible. For the DTB, an earlier patch of mine set CONFIG_SYS_BOOTMAPSZ. However, since some platforms have different restrictions on DTB and initrd location, that config option doesn't affect the initrd. We need to set the initrd_high environment variable to control the initrd relocation. Since we have carefully chosen the load addresses for the DTB and initrd (see comments in include/configs/tegraNNN-common.h re: values in MEM_LAYOUT_ENV_SETTINGS), we don't actually need any DTB or initrd relocation at all. Skipping relocation removes some redundant work. Hence, set both fdt_high and initrd_high to ffffffff which completely disables relocation. If the user does something unusual, such as using custom locations for the DTB/initrd load address or wanting to use DTB/initrd relocation for some reason, they can simply set these variables to custom values to override these environment defaults. With this change, cmd_sysboot works correctly for a filesystem created by the Fedora installer. Signed-off-by: Stephen Warren <swarren@nvidia.com> Signed-off-by: Tom Warren <twarren@nvidia.com>
| * | ARM: tegra: fix extlinux.conf search locationStephen Warren2014-06-19-4/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | extlinux.conf is stored in /boot/extlinux/extlinux.conf rather than /boot/extlinux.conf. Adjust Tegra's default boot scripts to use the correct location. This change aligns Tegra's boot scripts with rpi_b.h and also the location that the Fedora installer actually puts the file. Signed-off-by: Stephen Warren <swarren@nvidia.com> Signed-off-by: Tom Warren <twarren@nvidia.com>
| * | ARM: tegra: fix include guardJeroen Hofstee2014-06-19-1/+1
| |/ | | | | | | | | | | | | cc: Stephen Warren <swarren@nvidia.com> Signed-off-by: Jeroen Hofstee <jeroen@myspectrum.nl> Acked-by: Stephen Warren <swarren@nvidia.com> Signed-off-by: Tom Warren <twarren@nvidia.com>
* | Merge branch 'u-boot-ti/master' into 'u-boot-arm/master'Albert ARIBAUD2014-07-01-6/+16
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| * | omap3: overo: Select fdtfile for expansion boardAsh Charles2014-06-19-5/+5
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The u-boot Overo board actually supports both Overo (OMAP35xx) and Overo Storm (AM/DM37xx) COMs with a range of different expansion boards. This provides a mechanism to select the an appropriate device tree file based on the processor version and, if available, the expansion board ID written on the expansion board EEPROM. To match the 3.15+ kernels, fdtfile names have this format: "omap3-overo[-storm]-<expansion board name>.dtb" By default, we use "omap3-overo-storm-tobi.dtb". Signed-off-by: Ash Charles <ashcharles@gmail.com> Conflicts: include/configs/omap3_overo.h
| * | board: ti: am43xx: add support for AM43xx Starter KitFelipe Balbi2014-06-19-0/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | AM43xx Starter Kit is a new board based on AM437x line of SoCs. Being a low-cost EVM and small size EVM are intended to provide an entry level development platform on a full fledged Hardware System. Signed-off-by: Felipe Balbi <balbi@ti.com>
| * | ARM: keystone: aemif: move aemif driver to drivers/memory/ti-aemif.cKhoronzhuk, Ivan2014-06-19-0/+4
| | | | | | | | | | | | | | | | | | | | | | | | Move AEMIF driver to drivers/memory/ti-aemif.c along with AEMIF definitions collected in arch/arm/include/asm/ti-common/ti-aemif.h Acked-by: Vitaly Andrianov <vitalya@ti.com> Signed-off-by: Ivan Khoronzhuk <ivan.khoronzhuk@ti.com>
| * | mtd: nand: davinci: add header file for driver definitionsKhoronzhuk, Ivan2014-06-19-0/+4
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The definitions inside emif_defs.h concern davinci nand driver and should be in it's header. So create header file for davinci nand driver and move definitions from emif_defs.h and nand_defs.h to it. Acked-by: Vitaly Andrianov <vitalya@ti.com> Signed-off-by: Ivan Khoronzhuk <ivan.khoronzhuk@ti.com> [trini: Fixup more davinci breakage] Signed-off-by: Tom Rini <trini@ti.com>
| * | omap4: duovero: Correct name of default device treeAsh Charles2014-06-19-1/+1
| |/ | | | | | | Signed-off-by: Ash Charles <ashcharles@gmail.com>
* | Merge branch 'u-boot-imx/master' into 'u-boot-arm/master'Albert ARIBAUD2014-06-30-4/+109
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| * | mx25pdk: Remove CONFIG_SYS_GENERIC_BOARDFabio Estevam2014-06-26-2/+0
| | | | | | | | | | | | | | | | | | | | | | | | With CONFIG_SYS_GENERIC_BOARD the board hangs after issuing a 'save' command. Remove CONFIG_SYS_GENERIC_BOARD until this issue can be fixed properly. Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
| * | mx28evk: Fix warning when CONFIG_ENV_IS_IN_SPI_FLASH is selectedFabio Estevam2014-06-17-1/+4
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | When building a target with CONFIG_ENV_IS_IN_SPI_FLASH the following warning is seen: include/configs/mx28evk.h:73:0: warning: "CONFIG_ENV_SIZE" redefined [enabled by default] Protect the definition of CONFIG_ENV_SIZE to avoid the warning. Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
| * | embestmx6boards: Fix the dtb file name for riotboardFabio Estevam2014-06-17-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | The name of the dtb file used in the kernel is 'imx6dl-riotboard.dtb', so fix it accordingly. Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com> Tested-by: Iain Paton <ipaton0@gmail.com>
| * | embestmx6boards: Fix CONFIG_CONSOLE_DEVFabio Estevam2014-06-17-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | mars and riot boards use UART2 as console, so CONFIG_CONSOLE_DEV should point to 'ttymxc1' instead. Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com> Tested-by: Iain Paton <ipaton0@gmail.com>
| * | mx6: drop ARM errata 742230Shawn Guo2014-06-17-1/+0
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Commit e9fd66defd7e (ARM: mx6: define CONFIG_ARM_ERRATA_742230) enables errata 742230 for imx6, because it helps remove one reboot issue. However, this errata does not really apply on imx6, because Cortex-A9 on imx6 is r2p10 while the errata only applies to revisions r1p0..r2p2. At a later time, commit f71cbfe3ca5d (ARM: Add workaround for Cortex-A9 errata 794072) adds support of errata 794072, which applies to all Cortex-A9 revisions. As the workaround for both errata are exactly same, it makes a lot more sense to select 794072 instead of 742230 for imx6. Since we already enable 794072 for imx6, it's time to drop errata 742230 to avoid confusion. Signed-off-by: Shawn Guo <shawn.guo@freescale.com> Acked-by: Nitin Garg <nitin.garg@freescale.com>
| * | arm: mx5: Enable CONFIG_SYS_GENERIC_BOARD on M53EVKMarek Vasut2014-06-17-0/+1
| | | | | | | | | | | | Signed-off-by: Marek Vasut <marex@denx.de>
| * | mx25pdk: Add generic board supportFabio Estevam2014-06-06-0/+2
| | | | | | | | | | | | Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
| * | imx: ventana: switch to SPLTim Harvey2014-06-06-0/+11
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Switch to an SPL image. The SPL for Ventana does the following: - setup i2c and read the factory programmed EEPROM to obtain DRAM config and model for board-specific calibration data - configure DRAM per CPU/size/layout/devices/calibration - load u-boot.img from NAND and jump to it This allows for a single SPL+u-boot.img to replace the previous multiple boa configurations. Cc: Stefan Roese <sr@denx.de> Cc: Otavio Salvador <otavio@ossystems.com.br> Cc: Andy Ng <andreas2025@gmail.com> Cc: Eric Nelson <eric.nelson@boundarydevices.com> Cc: Tapani Utriainen <tapani@technexion.com> Cc: Tom Rini <trini@ti.com> Signed-off-by: Tim Harvey <tharvey@gateworks.com>
| * | mx6: add common SPL configurationTim Harvey2014-06-06-0/+71
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Add a common header which can hopefully be shared amon imx6 SPL users Cc: Stefan Roese <sr@denx.de> Cc: Otavio Salvador <otavio@ossystems.com.br> Cc: Andy Ng <andreas2025@gmail.com> Cc: Eric Nelson <eric.nelson@boundarydevices.com> Cc: Tapani Utriainen <tapani@technexion.com> Cc: Tom Rini <trini@ti.com> Signed-off-by: Tim Harvey <tharvey@gateworks.com> Acked-by: Stefano Babic <sbabic@denx.de> Acked-by: Nikita Kiryanov <nikita@compulab.co.il>
| * | mx6sabred: Add PFUZE100 PMIC supportFabio Estevam2014-05-28-0/+16
| | | | | | | | | | | | | | | | | | | | | | | | mx6sabresd boards have a PFUZE100 PMIC connected to I2C2 bus. Add support for it Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
| * | mx6sabreauto: Add the mx6dual-lite variantFabio Estevam2014-05-28-0/+4
| | | | | | | | | | | | | | | | | | Tested by booting a mainline kernel via TFTP. Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
* | | Merge branch 'u-boot/master' into 'u-boot-arm/master'Albert ARIBAUD2014-06-25-4067/+864
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| * \ \ Merge branch 'master' of git://git.denx.de/u-boot-dmTom Rini2014-06-24-1/+1
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| | * | | include/dm.h: fix inclusion guardJeroen Hofstee2014-06-21-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | cc: Simon Glass <sjg@chromium.org> Signed-off-by: Jeroen Hofstee <jeroen@myspectrum.nl> Acked-by: Simon Glass <sjg@chromium.org>
| * | | | mpc8313: add CONFIG_SYS_GENERIC_BOARD to ids8313 boardHeiko Schocher2014-06-23-1/+2
| |/ / / | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | - add CONFIG_SYS_GENERIC_BOARD - remove CONFIG_OF_CONTROL to boot again Signed-off-by: Heiko Schocher <hs@denx.de> Acked-by: Kim Phillips <kim.phillips@freescale.com> Acked-by: Simon Glass <sjg@chromium.org>
| * | | dm: Tidy up four minor code nitsSimon Glass2014-06-20-6/+28
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | There is a spelling mistake and two functions are missing comments altogether. Also the flags declaration is correct, but doesn't follow style. Finally, the uclass_get_device() function has some errors in its documentation. Fix these problems. Signed-off-by: Simon Glass <sjg@chromium.org> Acked-by: Marek Vasut <marex@denx.de>
| * | | tegra: Enable driver modelSimon Glass2014-06-20-0/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | | | Enable driver model for Tegra boards. Signed-off-by: Simon Glass <sjg@chromium.org> Acked-by: Stephen Warren <swarren@nvidia.com>
| * | | tegra: dts: Bring in GPIO bindings from linuxSimon Glass2014-06-20-0/+107
| | | | | | | | | | | | | | | | | | | | | | | | | | | | These files are taken from Linux 3.14. Signed-off-by: Simon Glass <sjg@chromium.org> Acked-by: Stephen Warren <swarren@nvidia.com>
| * | | dm: Cast away the const-ness of the global_data pointerSimon Glass2014-06-20-0/+4
| | | | | | | | | | | | | | | | | | | | | | | | | | | | In a very few cases we need to adjust the driver model root device, such as when setting it up at initialisation. Add a macro to make this easier. Signed-off-by: Simon Glass <sjg@chromium.org>
| * | | dm: Rename struct device_id to udevice_idSimon Glass2014-06-20-3/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | | | It is best to avoid having any occurence of 'struct device' in driver model, so rename to achieve this. Signed-off-by: Simon Glass <sjg@chromium.org>
| * | | sandbox: Support iotrace featureSimon Glass2014-06-20-0/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | | | Support the iotrace feature for sandbox, and enable it, using some dummy I/O access methods. Signed-off-by: Simon Glass <sjg@chromium.org>
| * | | Add an I/O tracing featureSimon Glass2014-06-20-0/+104
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | When debugging drivers it is useful to see what I/O accesses were done and in what order. Even if the individual accesses are of little interest it can be useful to verify that the access pattern is consistent each time an operation is performed. In this case a checksum can be used to characterise the operation of a driver. The checksum can be compared across different runs of the operation to verify that the driver is working properly. In particular, when performing major refactoring of the driver, where the access pattern should not change, the checksum provides assurance that the refactoring work has not broken the driver. Add an I/O tracing feature and associated commands to provide this facility. It works by sneaking into the io.h heder for an architecture and redirecting I/O accesses through its tracing mechanism. For now no commands are provided to examine the trace buffer. The format is fairly simple, so 'md' is a reasonable substitute. Note: The checksum feature is only useful for I/O regions where the contents do not change outside of software control. Where this is not suitable you can fall back to manually comparing the addresses. It might be useful to enhance tracing to only checksum the accesses and not the data read/written. Signed-off-by: Simon Glass <sjg@chromium.org>
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