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Chuanhong Guo 7612ecb201 ramips: mt7621: do memory detection on KSEG1 
It's reported that current memory detection code occasionally detects
larger memory under some bootloaders.
Current memory detection code tests whether address space wraps around
on KSEG0, which is unreliable because it's cached.

Rewrite memory size detection to perform the same test on KSEG1 instead.
While at it, this patch also does the following two things:
1. use a fixed pattern instead of a random function pointer as the magic
   value.
2. add an additional memory write and a second comparison as part of the
   test to prevent possible smaller memory detection result due to
   leftover values in memory.

Fixes: 6d91ddf517 ("ramips: mt7621: add support for memory detection")
Reported-by: Rui Salvaterra <rsalvaterra@gmail.com>
Tested-by: Rui Salvaterra <rsalvaterra@gmail.com>
Signed-off-by: Chuanhong Guo <gch981213@gmail.com>
(cherry picked from commit 2f024b7933)
[backport for OpenWrt 21.02 as it was reproducible with Kernel 5.4, see [1]]
[1]: https://forum.openwrt.org/t/113081
Tested-by: Dimitri Souza <dimitri.souza@gmail.com> [mt7621/archer-c6-v3]
Signed-off-by: Szabolcs Hubai <szab.hu@gmail.com>
2022-02-22 20:48:46 +08:00
.github build: Update README & github help 2018-07-08 09:41:53 +01:00
config build: Replace KERNEL_LOCKUP_DETECTOR with KERNEL_SOFTLOCKUP_DETECTOR 2021-09-13 18:48:55 +02:00
include OpenWrt v21.02.2: revert to branch defaults 2022-02-17 19:00:44 +01:00
LICENSES LICENSES: include all used licenses in LICENSES directory 2021-02-14 19:21:38 +01:00
package rpcd: backport 802.11ax support 2022-02-19 10:01:03 +01:00
scripts build,json: fix generation with empty profiles 2021-06-21 09:43:21 -10:00
target ramips: mt7621: do memory detection on KSEG1 2022-02-22 20:48:46 +08:00
toolchain glibc: update to latest 2.33 HEAD 2022-02-13 00:23:30 +01:00
tools tools/mtools: update to 4.0.35 2022-02-16 20:38:47 +01:00
.gitattributes add .gitattributes to prevent the git autocrlf option from messing with CRLF/LF in files 2012-05-08 13:30:49 +00:00
.gitignore gitignore: add .vscode for VS Code users 2021-03-29 22:26:27 +02:00
BSDmakefile build: use SPDX license tags 2021-02-05 14:54:47 +01:00
Config.in build: use SPDX license tags 2021-02-05 14:54:47 +01:00
COPYING COPYING: add COPYING file to specify project licenses 2021-02-14 19:21:38 +01:00
feeds.conf.default OpenWrt v21.02.2: revert to branch defaults 2022-02-17 19:00:44 +01:00
Makefile Revert "build: replace which with Bash command built-in" 2021-03-03 23:02:30 +01:00
README.md README: switch from freenode to oftc 2021-06-12 12:41:29 -10:00
rules.mk build: make sure asm gets built with -DPIC 2021-04-10 15:05:18 +02:00

README.md

OpenWrt logo

OpenWrt Project is a Linux operating system targeting embedded devices. Instead of trying to create a single, static firmware, OpenWrt provides a fully writable filesystem with package management. This frees you from the application selection and configuration provided by the vendor and allows you to customize the device through the use of packages to suit any application. For developers, OpenWrt is the framework to build an application without having to build a complete firmware around it; for users this means the ability for full customization, to use the device in ways never envisioned.

Sunshine!

Development

To build your own firmware you need a GNU/Linux, BSD or MacOSX system (case sensitive filesystem required). Cygwin is unsupported because of the lack of a case sensitive file system.

Requirements

You need the following tools to compile OpenWrt, the package names vary between distributions. A complete list with distribution specific packages is found in the Build System Setup documentation.

gcc binutils bzip2 flex python3 perl make find grep diff unzip gawk getopt
subversion libz-dev libc-dev rsync which

Quickstart

  1. Run ./scripts/feeds update -a to obtain all the latest package definitions defined in feeds.conf / feeds.conf.default

  2. Run ./scripts/feeds install -a to install symlinks for all obtained packages into package/feeds/

  3. Run make menuconfig to select your preferred configuration for the toolchain, target system & firmware packages.

  4. Run make to build your firmware. This will download all sources, build the cross-compile toolchain and then cross-compile the GNU/Linux kernel & all chosen applications for your target system.

Related Repositories

The main repository uses multiple sub-repositories to manage packages of different categories. All packages are installed via the OpenWrt package manager called opkg. If you're looking to develop the web interface or port packages to OpenWrt, please find the fitting repository below.

Support Information

For a list of supported devices see the OpenWrt Hardware Database

Documentation

Support Community

  • Forum: For usage, projects, discussions and hardware advise.
  • Support Chat: Channel #openwrt on oftc.net.

Developer Community

License

OpenWrt is licensed under GPL-2.0