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| author | Andrey Smirnov <andrew.smirnov@gmail.com> | 2018-08-20 23:41:07 -0700 |
|---|---|---|
| committer | Sascha Hauer <s.hauer@pengutronix.de> | 2018-08-31 08:30:07 +0200 |
| commit | b4e43bf44a43edd852cab4ece6ccbbbc1939e7d6 (patch) | |
| tree | 484aa7573ac09461dd938faee0b254e0cbf12842 /Documentation/boards | |
| parent | db6ee951649939a4a7c75d7ba7f20a4342f76780 (diff) | |
| download | barebox-b4e43bf44a43edd852cab4ece6ccbbbc1939e7d6.tar.gz barebox-b4e43bf44a43edd852cab4ece6ccbbbc1939e7d6.tar.xz | |
Revert "i.MX: Add provisions to boot from IRAM"
After being introduced 3 years ago this feature ended up being
"obsoleted by events" and project it was supposed to be a part of
winded down.
Revert this feature due to:
a) Lack of users
b) Existence of better way to make barebox load via SRAM as
intermediary step that does not require two separate images to be
built (.imx-sram-img)
This reverts commit 903c9477a08c5655161779ef4144886928ecc7d1.
Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Diffstat (limited to 'Documentation/boards')
| -rw-r--r-- | Documentation/boards/imx.rst | 27 |
1 files changed, 0 insertions, 27 deletions
diff --git a/Documentation/boards/imx.rst b/Documentation/boards/imx.rst index 56fd3ab41c..99ca10b7cc 100644 --- a/Documentation/boards/imx.rst +++ b/Documentation/boards/imx.rst @@ -118,33 +118,6 @@ Some notes about the mentioned *conditions*. - ``until_any_bit_clear`` waits until ``(*addr & mask) != mask`` is true - ``until_any_bit_set`` waits until ``(*addr & mask) != 0`` is true. -Internal Boot Mode Through Internal RAM(IRAM) ---------------------------------------------- - -The Internal Boot Mode Through Internal RAM is supported on: - -* i.MX51 - -As can be easily deduced from its name, the Internal Boot Mode Through -Internal RAM is just a variant of Internal Boot Mode so all of the -stated above still applies in this case. What it differs in is the following: - -* Boot process is done in two stages(First stage binary can be - produced with ``imx_v7-xload_defconfig``) -* DCD of the first stage image is set such that the image is fetched - into an unoccupied area or IRAM -* First stage image once uncompressed and set up will look for a - second stage bootloader on the same media it booted from and start - it(see mach-imx/xload.c for more details) -* Second stage images are just regular i.MX boot images - -Since on a typical i.MX SoC unused IRAM area is not enough to run -anything but a PBL this mode, due to its very limited usability, -serves only one purpose -- allow for a portion of a bootloader to be -executed without depending on DRAM to be functional. This peculiarity -of the mode can be used to implement various memory testing -scenarious. - USB Boot ^^^^^^^^ |