diff options
| author | Scott Rifenbark <scott.m.rifenbark@intel.com> | 2010-11-11 11:05:19 -0800 |
|---|---|---|
| committer | Richard Purdie <rpurdie@linux.intel.com> | 2010-11-15 22:25:25 +0000 |
| commit | c2f7ed472c2a9fde96fee5931612ac12ccc5e038 (patch) | |
| tree | 8827cbd959348b1e2054929f2515753a4423adf2 /documentation | |
| parent | b1f69283b3606be8b031f7df6a8c56816ecd97d8 (diff) | |
| download | poky-c2f7ed472c2a9fde96fee5931612ac12ccc5e038.tar.gz | |
Poky Reference Manual: Removed the bsp.xml file.
Because I am single-sourcing the bsp.xml file that is used both as
chapter 4 in the Poky Reference Manual and as the singe file in the BSP
Guide I removed the bsp.xml file that was local to the poky-ref-manual
folder.
Signed-off-by: Scott Rifenbark <scott.m.rifenbark@intel.com>
Diffstat (limited to 'documentation')
| -rw-r--r-- | documentation/poky-ref-manual/bsp.xml | 469 |
1 files changed, 0 insertions, 469 deletions
diff --git a/documentation/poky-ref-manual/bsp.xml b/documentation/poky-ref-manual/bsp.xml deleted file mode 100644 index 3256760339..0000000000 --- a/documentation/poky-ref-manual/bsp.xml +++ /dev/null | |||
| @@ -1,469 +0,0 @@ | |||
| 1 | <!DOCTYPE chapter PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN" "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd"> | ||
| 2 | <chapter id="bsp"> | ||
| 3 | |||
| 4 | <title>Board Support Packages (BSP) - Developers Guide</title> | ||
| 5 | |||
| 6 | <para> | ||
| 7 | A Board Support Package (BSP) is a collection of information that | ||
| 8 | defines how to support a particular hardware device, set of devices, or | ||
| 9 | hardware platform. | ||
| 10 | The BSP includes information about the hardware features | ||
| 11 | present on the device and kernel configuration information along with any | ||
| 12 | additional hardware drivers required. | ||
| 13 | The BSP also lists any additional software | ||
| 14 | components required in addition to a generic Linux software stack for both | ||
| 15 | essential and optional platform features. | ||
| 16 | </para> | ||
| 17 | |||
| 18 | <para> | ||
| 19 | This section (or document if you are reading the BSP Developer's Guide) defines | ||
| 20 | a structure for these components | ||
| 21 | so that BSPs follow a commonly understood layout. | ||
| 22 | Providing a common form allows end-users to understand and become familiar | ||
| 23 | with the layout. | ||
| 24 | A common form also encourages standardization | ||
| 25 | of software support of hardware. | ||
| 26 | </para> | ||
| 27 | |||
| 28 | <para> | ||
| 29 | The proposed format does have elements that are specific to the Poky and | ||
| 30 | OpenEmbedded build systems. | ||
| 31 | It is intended that this information can be | ||
| 32 | used by other systems besides Poky and OpenEmbedded and that it will be simple | ||
| 33 | to extract information and convert it to other formats if required. | ||
| 34 | Poky, through its standard layers mechanism, can directly accept The format | ||
| 35 | described as a layer. | ||
| 36 | The BSP captures all | ||
| 37 | the hardware-specific details in one place in a standard format, which is | ||
| 38 | useful for any person wishing to use the hardware platform regardless of | ||
| 39 | the build system they are using. | ||
| 40 | </para> | ||
| 41 | |||
| 42 | <para> | ||
| 43 | The BSP specification does not include a build system or other tools - | ||
| 44 | it is concerned with the hardware-specific components only. | ||
| 45 | At the end | ||
| 46 | distribution point you can ship the BSP combined with a build system | ||
| 47 | and other tools. | ||
| 48 | However, it is important to maintain the distinction that these | ||
| 49 | are separate components that happen to be combined in certain end products. | ||
| 50 | </para> | ||
| 51 | |||
| 52 | <section id="bsp-filelayout"> | ||
| 53 | <title>Example Filesystem Layout</title> | ||
| 54 | |||
| 55 | <para> | ||
| 56 | The BSP consists of a file structure inside a base directory, meta-bsp in this example, | ||
| 57 | where "bsp" is a placeholder for the machine or platform name. | ||
| 58 | Examples of some files that it could contain are: | ||
| 59 | </para> | ||
| 60 | |||
| 61 | <para> | ||
| 62 | <programlisting> | ||
| 63 | meta-bsp/ | ||
| 64 | meta-bsp/binary/zImage | ||
| 65 | meta-bsp/binary/poky-image-minimal.directdisk | ||
| 66 | meta-bsp/conf/layer.conf | ||
| 67 | meta-bsp/conf/machine/*.conf | ||
| 68 | meta-bsp/conf/machine/include/tune-*.inc | ||
| 69 | meta-bsp/packages/bootloader/bootloader_0.1.bb | ||
| 70 | meta-bsp/packages/linux/linux-bsp-2.6.50/*.patch | ||
| 71 | meta-bsp/packages/linux/linux-bsp-2.6.50/defconfig-bsp | ||
| 72 | meta-bsp/packages/linux/linux-bsp_2.6.50.bb | ||
| 73 | meta-bsp/packages/modem/modem-driver_0.1.bb | ||
| 74 | meta-bsp/packages/modem/modem-daemon_0.1.bb | ||
| 75 | meta-bsp/packages/image-creator/image-creator-native_0.1.bb | ||
| 76 | meta-bsp/prebuilds/ | ||
| 77 | </programlisting> | ||
| 78 | </para> | ||
| 79 | |||
| 80 | <para> | ||
| 81 | The following sections detail what these files and directories could contain. | ||
| 82 | </para> | ||
| 83 | |||
| 84 | </section> | ||
| 85 | |||
| 86 | <section id="bsp-filelayout-binary"> | ||
| 87 | <title>Prebuilt User Binaries (meta-bsp/binary/*)</title> | ||
| 88 | |||
| 89 | <para> | ||
| 90 | This optional area contains useful prebuilt kernels and userspace filesystem | ||
| 91 | images appropriate to the target system. | ||
| 92 | Users could use these to get a system | ||
| 93 | running and quickly get started on development tasks. | ||
| 94 | The exact types of binaries | ||
| 95 | present are highly hardware-dependent. | ||
| 96 | However, a README file should be present | ||
| 97 | that explains how to use them with the target hardware. | ||
| 98 | If prebuilt binaries are | ||
| 99 | present, source code to meet licensing requirements must also be provided in | ||
| 100 | some form. | ||
| 101 | </para> | ||
| 102 | |||
| 103 | </section> | ||
| 104 | |||
| 105 | <section id='bsp-filelayout-layer'> | ||
| 106 | <title>Layer Configuration (meta-bsp/conf/layer.conf)</title> | ||
| 107 | |||
| 108 | <para> | ||
| 109 | This file identifies the structure as a Poky layer, identifies the | ||
| 110 | contents of the layer and contains information about how Poky should use | ||
| 111 | it. | ||
| 112 | Generally, a standard boilerplate file consisting of the following works. | ||
| 113 | </para> | ||
| 114 | |||
| 115 | <para> | ||
| 116 | <programlisting> | ||
| 117 | # We have a conf directory, add to BBPATH | ||
| 118 | BBPATH := "${BBPATH}${LAYERDIR}" | ||
| 119 | |||
| 120 | # We have a recipes directory containing .bb and .bbappend files, add to BBFILES | ||
| 121 | BBFILES := "${BBFILES} ${LAYERDIR}/recipes/*/*.bb \ ${LAYERDIR}/recipes/*/*.bbappend" | ||
| 122 | |||
| 123 | BBFILE_COLLECTIONS += "bsp" | ||
| 124 | BBFILE_PATTERN_bsp := "^${LAYERDIR}/" | ||
| 125 | BBFILE_PRIORITY_bsp = "5" | ||
| 126 | </programlisting> | ||
| 127 | </para> | ||
| 128 | |||
| 129 | <para> | ||
| 130 | This file simply makes bitbake aware of the recipes and conf directories and is required | ||
| 131 | for recognition of the BSP by Poky. | ||
| 132 | </para> | ||
| 133 | |||
| 134 | </section> | ||
| 135 | |||
| 136 | <section id="bsp-filelayout-machine"> | ||
| 137 | <title>Hardware Configuration Options (meta-bsp/conf/machine/*.conf)</title> | ||
| 138 | |||
| 139 | <para> | ||
| 140 | The machine files bind together all the information contained elsewhere | ||
| 141 | in the BSP into a format that Poky/OpenEmbedded can understand. | ||
| 142 | If the BSP supports multiple machines, multiple machine configuration files | ||
| 143 | can be present. | ||
| 144 | These filenames correspond to the values to which users have set the MACHINE variable. | ||
| 145 | </para> | ||
| 146 | |||
| 147 | <para> | ||
| 148 | These files define things such as what kernel package to use | ||
| 149 | (PREFERRED_PROVIDER of virtual/kernel), what hardware drivers to | ||
| 150 | include in different types of images, any special software components | ||
| 151 | that are needed, any bootloader information, and also any special image | ||
| 152 | format requirements. | ||
| 153 | </para> | ||
| 154 | |||
| 155 | <para> | ||
| 156 | At least one machine file is required for a Poky BSP layer. | ||
| 157 | However, you can supply more than one file. | ||
| 158 | </para> | ||
| 159 | |||
| 160 | </section> | ||
| 161 | |||
| 162 | <section id="bsp-filelayout-tune"> | ||
| 163 | <title>Hardware Optimization Options (meta-bsp/conf/machine/include/tune-*.inc)</title> | ||
| 164 | |||
| 165 | <para> | ||
| 166 | These are shared hardware "tuning" definitions and are commonly used to | ||
| 167 | pass specific optimization flags to the compiler. | ||
| 168 | An example is tune-atom.inc: | ||
| 169 | </para> | ||
| 170 | <para> | ||
| 171 | <programlisting> | ||
| 172 | BASE_PACKAGE_ARCH = "core2" | ||
| 173 | TARGET_CC_ARCH = "-m32 -march=core2 -msse3 -mtune=generic -mfpmath=sse" | ||
| 174 | </programlisting> | ||
| 175 | </para> | ||
| 176 | <para> | ||
| 177 | This example defines a new package architecture called "core2" and uses the | ||
| 178 | specified optimization flags, which are carefully chosen to give best | ||
| 179 | performance on atom processors. | ||
| 180 | </para> | ||
| 181 | <para> | ||
| 182 | The tune file would be included by the machine definition and can be | ||
| 183 | contained in the BSP or referenced from one of the standard core set of | ||
| 184 | files included with Poky itself. | ||
| 185 | </para> | ||
| 186 | <para> | ||
| 187 | Both the base package architecuture file and the tune file are optional for a Poky BSP layer. | ||
| 188 | </para> | ||
| 189 | </section> | ||
| 190 | |||
| 191 | <section id='bsp-filelayout-kernel'> | ||
| 192 | <title>Linux Kernel Configuration (meta-bsp/packages/linux/*)</title> | ||
| 193 | |||
| 194 | <para> | ||
| 195 | These files make up the definition of a kernel to use with this | ||
| 196 | hardware. | ||
| 197 | In this case, it is a complete self-contained kernel with its own | ||
| 198 | configuration and patches. | ||
| 199 | However, kernels can be shared between many machines as well. | ||
| 200 | Following is an example: | ||
| 201 | <programlisting> | ||
| 202 | meta-bsp/packages/linux/linux-bsp_2.6.50.bb | ||
| 203 | </programlisting> | ||
| 204 | This example file is the core kernel recipe that details from where to get the kernel | ||
| 205 | source. | ||
| 206 | All standard source code locations are supported so this could | ||
| 207 | be a release tarball, some git repository, or source included in | ||
| 208 | the directory within the BSP itself. | ||
| 209 | </para> | ||
| 210 | <para> | ||
| 211 | The file then contains information about what patches to apply and how to configure and build them. | ||
| 212 | It can reuse the main Poky kernel build class, so the definitions here can remain very simple. | ||
| 213 | </para> | ||
| 214 | <para> | ||
| 215 | <programlisting> | ||
| 216 | linux-bsp-2.6.50/*.patch | ||
| 217 | </programlisting> | ||
| 218 | </para> | ||
| 219 | <para> | ||
| 220 | The above example file contains patches you can apply against the base kernel, from wherever | ||
| 221 | they may have been obtained. | ||
| 222 | </para> | ||
| 223 | <para> | ||
| 224 | <programlisting> | ||
| 225 | meta-bsp/packages/linux/linux-bsp-2.6.50/defconfig-bsp | ||
| 226 | </programlisting> | ||
| 227 | </para> | ||
| 228 | <para> | ||
| 229 | Finally, this last example file contains kernel configuration information. | ||
| 230 | </para> | ||
| 231 | <para> | ||
| 232 | Examples of kernel recipes are available in Poky itself. | ||
| 233 | These files are optional since a kernel from Poky could be selected, although it | ||
| 234 | would be unusual not to have a kernel configuration. | ||
| 235 | </para> | ||
| 236 | </section> | ||
| 237 | |||
| 238 | <section id='bsp-filelayout-packages'> | ||
| 239 | <title>Other Software (meta-bsp/packages/*)</title> | ||
| 240 | |||
| 241 | <para> | ||
| 242 | This section describes other pieces of software that the hardware might need for best | ||
| 243 | operation. | ||
| 244 | This section shows examples of the kinds of things that you could encounter. | ||
| 245 | The examples are standard <filename>.bb</filename> file recipes in the | ||
| 246 | usual Poky format. | ||
| 247 | You can include the source directly by referring to it in the source control system or | ||
| 248 | the released tarballs of external software projects. | ||
| 249 | You only need to provide these types of files if the platform requires them. | ||
| 250 | </para> | ||
| 251 | <para> | ||
| 252 | The following file is a bootloader recipe that can be used to generate a new | ||
| 253 | bootloader binary. | ||
| 254 | Sometimes these files are included in the final image format and are needed to re-flash hardware. | ||
| 255 | </para> | ||
| 256 | <para> | ||
| 257 | <programlisting> | ||
| 258 | meta-bsp/packages/bootloader/bootloader_0.1.bb | ||
| 259 | </programlisting> | ||
| 260 | </para> | ||
| 261 | <para> | ||
| 262 | These next two files are examples of a hardware driver and a hardware daemon that might need | ||
| 263 | to be included in images to make the hardware useful. | ||
| 264 | Although the example uses "modem" there may be other components needed, such as firmware. | ||
| 265 | </para> | ||
| 266 | <para> | ||
| 267 | <programlisting> | ||
| 268 | meta-bsp/packages/modem/modem-driver_0.1.bb | ||
| 269 | meta-bsp/packages/modem/modem-daemon_0.1.bb | ||
| 270 | </programlisting> | ||
| 271 | </para> | ||
| 272 | <para> | ||
| 273 | Sometimes the device needs an image in a very specific format so that the update | ||
| 274 | mechanism can accept and re-flash it. | ||
| 275 | Recipes to build the tools needed to do this can be included with the BSP. | ||
| 276 | Following is an example. | ||
| 277 | </para> | ||
| 278 | <para> | ||
| 279 | <programlisting> | ||
| 280 | meta-bsp/packages/image-creator/image-creator-native_0.1.bb | ||
| 281 | </programlisting> | ||
| 282 | </para> | ||
| 283 | </section> | ||
| 284 | |||
| 285 | <section id='bs-filelayout-bbappend'> | ||
| 286 | <title>Append BSP-Specific Information to Existing Recipes</title> | ||
| 287 | <para> | ||
| 288 | Suppose you have a recipe such as 'pointercal' that requires machine-specific information. | ||
| 289 | At the same time, you have your new BSP code nicely partitioned into a layer through which | ||
| 290 | you would also like to specify any machine-specific information associated with your new machine. | ||
| 291 | Before the <filename>.bbappend</filename> extension was introduced, you would have to copy the whole | ||
| 292 | pointercal recipe and files into your layer and then add the single file for your machine. | ||
| 293 | </para> | ||
| 294 | <para> | ||
| 295 | With the <filename>.bbappend</filename> extension, however, your work becomes much easier. | ||
| 296 | This extension allows you to easily merge BSP-specific information with the original recipe. | ||
| 297 | Whenever bitbake finds any <filename>.bbappend</filename> files they will be | ||
| 298 | included after bitbake loads the associated <filename>.bb</filename> but before any finalize | ||
| 299 | or anonymous methods run. | ||
| 300 | This allows the BSP layer to do whatever it might want to do to customize the original recipe. | ||
| 301 | </para> | ||
| 302 | <para> | ||
| 303 | If your recipe needs to reference extra files it can use the FILESEXTRAPATH variable | ||
| 304 | to specify their location. | ||
| 305 | The example below shows extra files contained in a folder called ${PN} (the package name). | ||
| 306 | </para> | ||
| 307 | <programlisting> | ||
| 308 | FILESEXTRAPATHS := "${THISDIR}/${PN}" | ||
| 309 | </programlisting> | ||
| 310 | <para> | ||
| 311 | This technique allows the BSP to add machine-specific configuration files to the layer directory, | ||
| 312 | which will be picked up by bitbake. | ||
| 313 | For an example see <filename>meta-emenlow/packages/formfactor</filename>. | ||
| 314 | </para> | ||
| 315 | </section> | ||
| 316 | |||
| 317 | <section id="bsp-filelayout-prebuilds"> | ||
| 318 | <title>Prebuild Data (meta-bsp/prebuilds/*)</title> | ||
| 319 | <para> | ||
| 320 | This location can contain precompiled representations of the source code | ||
| 321 | contained elsewhere in the BSP layer. | ||
| 322 | Assuming a compatible configuration is used, Poky can process and use these optional precompiled | ||
| 323 | representations to provide much faster build times. | ||
| 324 | </para> | ||
| 325 | </section> | ||
| 326 | |||
| 327 | <section id='bsp-click-through-licensing'> | ||
| 328 | <title>BSP 'Click-Through' Licensing Procedure</title> | ||
| 329 | |||
| 330 | <note><para> This section describes how | ||
| 331 | click-through licensing is expected to work. | ||
| 332 | Currently, this functionality is not yet implemented. | ||
| 333 | </para></note> | ||
| 334 | |||
| 335 | <para> | ||
| 336 | In some cases, a BSP contains separately licensed IP | ||
| 337 | (Intellectual Property) for a component that imposes | ||
| 338 | upon the user a requirement to accept the terms of a | ||
| 339 | 'click-through' license. | ||
| 340 | Once the license is accepted the | ||
| 341 | Poky build system can then build and include the | ||
| 342 | corresponding component in the final BSP image. | ||
| 343 | Some affected components might be essential to the normal | ||
| 344 | functioning of the system and have no 'free' replacement | ||
| 345 | (i.e. the resulting system would be non-functional | ||
| 346 | without them). | ||
| 347 | On the other hand, other components might be simply | ||
| 348 | 'good-to-have' or purely elective, or if essential | ||
| 349 | nonetheless have a 'free' (possibly less-capable) | ||
| 350 | version that could be used as a in the BSP recipe. | ||
| 351 | </para> | ||
| 352 | |||
| 353 | <para> | ||
| 354 | For cases where you can substitute something and still maintain functionality, the Poky website will make | ||
| 355 | available a 'de-featured' BSP completely free of | ||
| 356 | the encumbered IP. | ||
| 357 | In that case you can use the substitution directly and without | ||
| 358 | any further licensing requirements. | ||
| 359 | If present, this | ||
| 360 | fully 'de-featured' BSP will be named meta-bsp (i.e. the | ||
| 361 | normal default naming convention). | ||
| 362 | If available, this is the simplest the most preferred option. | ||
| 363 | This, of course, assumes the resulting functionality meets requirements. | ||
| 364 | </para> | ||
| 365 | |||
| 366 | <para> | ||
| 367 | If however, a non-encumbered version is unavailable or | ||
| 368 | the 'free' version would provide unsuitable | ||
| 369 | functionality or quality, an encumbered version can be | ||
| 370 | used. | ||
| 371 | Encumbered versions of a BSP are given names of | ||
| 372 | the form meta-bsp-nonfree. | ||
| 373 | </para> | ||
| 374 | |||
| 375 | <para> | ||
| 376 | Several methods exist within the Poky build system to satisfy the licensing | ||
| 377 | requirements for an encumbered BSP. | ||
| 378 | The following list describes them in preferential order: | ||
| 379 | </para> | ||
| 380 | |||
| 381 | <orderedlist> | ||
| 382 | <listitem> | ||
| 383 | |||
| 384 | <para> | ||
| 385 | Get a license key (or keys) for the encumbered BSP | ||
| 386 | by visiting | ||
| 387 | <ulink url='https://pokylinux.org/bsp-keys.html'>https://pokylinux.org/bsp-keys.html</ulink> | ||
| 388 | and give the name of the BSP and your e-mail address in the web form. | ||
| 389 | </para> | ||
| 390 | |||
| 391 | <programlisting> | ||
| 392 | [screenshot of dialog box] | ||
| 393 | </programlisting> | ||
| 394 | |||
| 395 | <para> | ||
| 396 | After agreeing to any applicable license terms, the | ||
| 397 | BSP key(s) will be immediately sent to the address | ||
| 398 | you gave and you can use them by specifying BSPKEY_<keydomain> | ||
| 399 | environment variables when building the image: | ||
| 400 | </para> | ||
| 401 | |||
| 402 | <programlisting> | ||
| 403 | $ BSPKEY_<keydomain>=<key> bitbake poky-image-sato | ||
| 404 | </programlisting> | ||
| 405 | |||
| 406 | <para> | ||
| 407 | These steps allow the encumbered image to be built | ||
| 408 | with no change at all to the normal build process. | ||
| 409 | </para> | ||
| 410 | |||
| 411 | <para> | ||
| 412 | Equivalently and probably more conveniently, a line | ||
| 413 | for each key can instead be put into the user's | ||
| 414 | <filename>local.conf</filename> file. | ||
| 415 | </para> | ||
| 416 | |||
| 417 | <para> | ||
| 418 | The <keydomain> component of the | ||
| 419 | BSPKEY_<keydomain> is required because there | ||
| 420 | might be multiple licenses in effect for a give BSP. | ||
| 421 | In such cases, a given <keydomain> corresponds to | ||
| 422 | a particular license. In order for an encumbered | ||
| 423 | BSP that encompasses multiple key domains to be built | ||
| 424 | successfully, a <keydomain> entry for each | ||
| 425 | applicable license must be present in <filename>local.conf</filename> or | ||
| 426 | supplied on the command-line. | ||
| 427 | </para> | ||
| 428 | </listitem> | ||
| 429 | <listitem> | ||
| 430 | <para> | ||
| 431 | Do nothing - build as you normally would. | ||
| 432 | When a license is needed the build will stop and prompt you with instructions. | ||
| 433 | Follow the license prompts that originate from the | ||
| 434 | encumbered BSP. | ||
| 435 | These prompts usually take the form of instructions | ||
| 436 | needed to manually fetch the encumbered package(s) | ||
| 437 | and md5 sums into the required directory (e.g. the poky/build/downloads) | ||
| 438 | Once the manual package fetch has been | ||
| 439 | completed, restart the build to continue where | ||
| 440 | it left off. | ||
| 441 | During the build the prompt will not appear again since you have satisfied the | ||
| 442 | requirement. | ||
| 443 | </para> | ||
| 444 | </listitem> | ||
| 445 | <listitem> | ||
| 446 | <para> | ||
| 447 | Get a full-featured BSP recipe rather than a key, by | ||
| 448 | visiting | ||
| 449 | <ulink url='https://pokylinux.org/bsps.html'>https://pokylinux.org/bsps.html</ulink>. | ||
| 450 | Accepting the license agreement(s) presented will | ||
| 451 | subsequently allow you to download a tarball | ||
| 452 | containing a full-featured BSP that is legally cleared for | ||
| 453 | your use by the just-given license agreement(s). | ||
| 454 | This method will also allow the encumbered image to | ||
| 455 | be built with no change at all to the normal build | ||
| 456 | process. | ||
| 457 | </para> | ||
| 458 | </listitem> | ||
| 459 | </orderedlist> | ||
| 460 | <para> | ||
| 461 | Note that the third method is also the only option available | ||
| 462 | when downloading pre-compiled images generated from | ||
| 463 | non-free BSPs. | ||
| 464 | Those images are likewise available at | ||
| 465 | <ulink url='https://pokylinux.org/bsps.html'>https://pokylinux.org/bsps.html</ulink>. | ||
| 466 | </para> | ||
| 467 | </section> | ||
| 468 | |||
| 469 | </chapter> | ||
