Easy projects: Difference between revisions
No edit summary |
No edit summary |
||
| (22 intermediate revisions by 4 users not shown) | |||
| Line 1: | Line 1: | ||
This page is listing small projects for the beginners, to start learning about flashrom development and do some useful tasks. | |||
If you're a flashrom newbie, this page is for you. | If you're a flashrom newbie, this page is for you. | ||
= Open tasks = | = Open tasks = | ||
Important note: every task in easy projects has a topic. If you send a patch for one of the projects, please add a topic to your gerrit patch. Before sending a patch, have a look at currently open patches for the same topic, to avoid accidentally duplicating someone else's effort. | |||
We've had situations when two contributors sent patches for the same thing (without knowing about each other), and situations like that are usually stressful and not easily resolved. Please look for patches under the topic, and add a topic to your own patches. | |||
Topic can be added when pushing the patch, for example <tt>git push upstream HEAD:refs/for/master%topic=easy_projects_unit_tests</tt>. Alternatively topic can be added on Gerrit UI. | |||
== Write a unit test == | |||
Topic: easy_projects_unit_test | |||
Unit tests are located under tests/ directory in the tree. Have a look at existing tests, and think of what you can add. The test for easy projects can be small. Hint: it is easier to add a test scenario for the area that already has tests (for example new scenario for programmer lifecycle, given that the programmer has some tests). It is harder to write a test for the programmer that has no tests at all. | |||
== Take a bug in a bugtracker == | |||
Topic: easy_projects_bugtracker | |||
We have an "Easy projects" category in our bugtracker, and you can take a bug from there. | |||
List of bugs in the category can be found by the [[https://ticket.coreboot.org/projects/flashrom/issues?utf8=%E2%9C%93&set_filter=1&sort=id%3Adesc&f%5B%5D=status_id&op%5Bstatus_id%5D=o&f%5B%5D=category_id&op%5Bcategory_id%5D=%3D&v%5Bcategory_id%5D%5B%5D=16&f%5B%5D=&c%5B%5D=tracker&c%5B%5D=status&c%5B%5D=priority&c%5B%5D=category&c%5B%5D=subject&c%5B%5D=assigned_to&c%5B%5D=updated_on&group_by=&t%5B%5D link]] | |||
== Fix issues found by scan-build == | |||
Topic: easy_project_scan_build | |||
Run scan-build in the tree: | |||
<tt>make clean && CFLAGS='-fsanitize=leak' scan-build make</tt> | |||
At the moment of writing this, it produces around 30 issues, which means there are plenty of easy projects. | |||
In general, one issue == one Easy project. However, you can fix more than one issue in the same patch if there are multiple occurrences of the same issue in the same file. | |||
You need to install clang-tools for this project. | |||
== Find chips without voltage data == | |||
Topic: easy_project_chips_voltage | |||
We have added allowed supply voltage ranges (usually denoted VCC in datasheets) to the chip definitions in flashchips.c, but not all of them. | |||
Complete the list by looking for the right datasheet and editing flashchips.c accordingly. | |||
== Find boards that have a board enable but are not mentioned in print.c == | == Find boards that have a board enable but are not mentioned in print.c == | ||
There may be a few boards that had a | Topic: easy_projects_boards | ||
There may be a few boards that had a [[Board Enable]] added (in board_enable.c) but which were not added to the array named boards_known in print.c (usually by mistake). | |||
Find those and send a list or even a patch for print.c to the mailing list. | Find those and send a list or even a patch for print.c to the mailing list. | ||
Even better would be an automatic detection of such mistakes. | |||
We already do some sanity checks on startup (cf. <tt>selfcheck()</tt> in <tt>flashrom.c</tt>). | |||
== Add timing info to flash chip definitions (mostly done) == | == Add timing info to flash chip definitions (mostly done) == | ||
Topic: easy_project_chip_timing | |||
Go through the list of flash chips in flashchips.c inside the flashrom source. For each chip (except SPI chips), read through the data sheets and add a comment to the flash chip definition which contains the timing information in microseconds(!) for the probe sequence. | Go through the list of flash chips in flashchips.c inside the flashrom source. For each chip (except SPI chips), read through the data sheets and add a comment to the flash chip definition which contains the timing information in microseconds(!) for the probe sequence. | ||
| Line 19: | Line 61: | ||
== Add new flash chip definitions == | == Add new flash chip definitions == | ||
Topic: easy_project_new_chip | |||
We have a few dozen chip IDs listed in flash.h, but not in flashchips.c. | We have a few dozen chip IDs listed in flash.h, but not in flashchips.c. You can find them by running '''util/list_yet_unsupported_chips.sh'''. Then dig up the data sheets and add chip definitions for them to flashchips.c. You can use similar flash chips as a guideline. Check our list of pending patches (http://patchwork.coreboot.org/project/flashrom/list/) to not duplicate someone's work. Reviewing any pending patches by verifying the values in the patches is of course also very welcomed too! The process of adding a chip and the needed data structures are explained [[Development_Guidelines#Adding.2Freviewing_a_new_flash_chip|here]]. | ||
This will reduce the number of undetected chips. | This will reduce the number of undetected chips and every added chip broadens flashrom support. | ||
== Add (ferroelectric, F-RAM) SPI chips made by Cypress / Ramtron == | |||
Topic: easy_project_cypress_ramtron | |||
http://www.cypress.com/products/f-ram-serial | |||
Example datasheet: http://www.cypress.com/file/41676/download | |||
These work mostly like SPI flashes, except for (these are just the biggest points): | |||
* No erase command (or erasing necessary) | |||
* 2-byte addresses (atleast for smaller/older devices) | |||
== | == Test flashrom == | ||
Topic: easy_project_test_flashrom | |||
Please see the [[Board Testing HOWTO]]. | |||
== Replace programmer_delay() with internal_sleep() where appropriate == | |||
Topic: easy_project_delay | |||
If a delay call does not depend on precise timing and if the '''programmer''' in question '''does not offer its own delay function''', programmer_delay() can be replaced with internal_sleep(). | |||
If a delay call does not depend on precise timing and if the delay '''should run on the host''', programmer_delay() can be replaced with internal_sleep(). | |||
Latest revision as of 10:39, 3 March 2023
This page is listing small projects for the beginners, to start learning about flashrom development and do some useful tasks.
If you're a flashrom newbie, this page is for you.
Open tasks
Important note: every task in easy projects has a topic. If you send a patch for one of the projects, please add a topic to your gerrit patch. Before sending a patch, have a look at currently open patches for the same topic, to avoid accidentally duplicating someone else's effort.
We've had situations when two contributors sent patches for the same thing (without knowing about each other), and situations like that are usually stressful and not easily resolved. Please look for patches under the topic, and add a topic to your own patches.
Topic can be added when pushing the patch, for example git push upstream HEAD:refs/for/master%topic=easy_projects_unit_tests. Alternatively topic can be added on Gerrit UI.
Write a unit test
Topic: easy_projects_unit_test
Unit tests are located under tests/ directory in the tree. Have a look at existing tests, and think of what you can add. The test for easy projects can be small. Hint: it is easier to add a test scenario for the area that already has tests (for example new scenario for programmer lifecycle, given that the programmer has some tests). It is harder to write a test for the programmer that has no tests at all.
Take a bug in a bugtracker
Topic: easy_projects_bugtracker
We have an "Easy projects" category in our bugtracker, and you can take a bug from there. List of bugs in the category can be found by the [link]
Fix issues found by scan-build
Topic: easy_project_scan_build
Run scan-build in the tree:
make clean && CFLAGS='-fsanitize=leak' scan-build make
At the moment of writing this, it produces around 30 issues, which means there are plenty of easy projects.
In general, one issue == one Easy project. However, you can fix more than one issue in the same patch if there are multiple occurrences of the same issue in the same file.
You need to install clang-tools for this project.
Find chips without voltage data
Topic: easy_project_chips_voltage
We have added allowed supply voltage ranges (usually denoted VCC in datasheets) to the chip definitions in flashchips.c, but not all of them. Complete the list by looking for the right datasheet and editing flashchips.c accordingly.
Find boards that have a board enable but are not mentioned in print.c
Topic: easy_projects_boards
There may be a few boards that had a Board Enable added (in board_enable.c) but which were not added to the array named boards_known in print.c (usually by mistake).
Find those and send a list or even a patch for print.c to the mailing list.
Even better would be an automatic detection of such mistakes. We already do some sanity checks on startup (cf. selfcheck() in flashrom.c).
Add timing info to flash chip definitions (mostly done)
Topic: easy_project_chip_timing
Go through the list of flash chips in flashchips.c inside the flashrom source. For each chip (except SPI chips), read through the data sheets and add a comment to the flash chip definition which contains the timing information in microseconds(!) for the probe sequence.
This will make probing a lot more reliable.
Every annotated chip helps.
Add new flash chip definitions
Topic: easy_project_new_chip
We have a few dozen chip IDs listed in flash.h, but not in flashchips.c. You can find them by running util/list_yet_unsupported_chips.sh. Then dig up the data sheets and add chip definitions for them to flashchips.c. You can use similar flash chips as a guideline. Check our list of pending patches (http://patchwork.coreboot.org/project/flashrom/list/) to not duplicate someone's work. Reviewing any pending patches by verifying the values in the patches is of course also very welcomed too! The process of adding a chip and the needed data structures are explained here.
This will reduce the number of undetected chips and every added chip broadens flashrom support.
Add (ferroelectric, F-RAM) SPI chips made by Cypress / Ramtron
Topic: easy_project_cypress_ramtron
http://www.cypress.com/products/f-ram-serial
Example datasheet: http://www.cypress.com/file/41676/download
These work mostly like SPI flashes, except for (these are just the biggest points):
- No erase command (or erasing necessary)
- 2-byte addresses (atleast for smaller/older devices)
Test flashrom
Topic: easy_project_test_flashrom
Please see the Board Testing HOWTO.
Replace programmer_delay() with internal_sleep() where appropriate
Topic: easy_project_delay
If a delay call does not depend on precise timing and if the programmer in question does not offer its own delay function, programmer_delay() can be replaced with internal_sleep(). If a delay call does not depend on precise timing and if the delay should run on the host, programmer_delay() can be replaced with internal_sleep().