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doc: ti: am335x_evm: Minor general updates

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- At this point there are a large number of Beaglebone boards, refer to
  them as a family rather than a growing list.
- Reword customization as we're largely Kconfig-oriented now.
- Remove the NOR section as the relevant defconfigs have long been
  removed and the general support was not updated.

Signed-off-by: Tom Rini <trini@konsulko.com>
This commit is contained in:
Tom Rini 2021-09-11 08:57:32 -04:00
parent c8fff5d2b5
commit b8292240d7
1 changed files with 8 additions and 35 deletions
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43
doc/board/ti/am335x_evm.rst
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@ -4,8 +4,9 @@
Summary
=======
This document covers various features of the 'am335x_evm' build, and some of
the related build targets (am335x_evm_uartN, etc).
This document covers various features of the `am335x_evm` default
configuration, some of the related defconfigs, and how to enable hardware
features not present by default in the defconfigs.
Hardware
--------
@ -14,8 +15,7 @@ The binary produced by this board supports, based on parsing of the EEPROM
documented in TI's reference designs:
* AM335x GP EVM
* AM335x EVM SK
* Beaglebone White
* Beaglebone Black
* The Beaglebone family of designs
Customization
-------------
@ -35,13 +35,10 @@ The following blocks are required:
* I2C, to talk with the PMIC and ensure that we do not run afoul of
errata 1.0.24.
When removing options as part of customization,
CONFIG_EXTRA_ENV_SETTINGS will need additional care to update for your
needs and to remove no longer relevant options as in some cases we
define additional text blocks (such as for NAND or DFU strings). Also
note that all of the SPL options are grouped together, rather than with
the IP blocks, so both areas will need their choices updated to reflect
the custom design.
When removing options as part of customization, note that you will likely need
to look at both `include/configs/am335x_evm.h`,
`include/configs/ti_am335x_common.h` and `include/configs/am335x_evm.h` as the
migration to Kconfig is not yet complete.
NAND
----
@ -89,30 +86,6 @@ Step-2: Flashing NAND via MMC/SD
Step-3: Set BOOTSEL pin to select NAND boot, and POR the device.
The device should boot from images flashed on NAND device.
NOR
---
The Beaglebone White can be equipped with a "memory cape" that in turn can
have a NOR module plugged into it. In this case it is then possible to
program and boot from NOR. Note that due to how U-Boot is designed we
must build a specific version of U-Boot that knows we have NOR flash. This
build is named 'am335x_evm_nor'. Further, we have a 'am335x_evm_norboot'
build that will assume that the environment is on NOR rather than NAND. In
the following example we assume that and SD card has been populated with
MLO and u-boot.img from a 'am335x_evm_nor' build and also contains the
'u-boot.bin' from a 'am335x_evm_norboot' build. When booting from NOR, a
binary must be written to the start of NOR, with no header or similar
prepended. In the following example we use a size of 512KiB (0x80000)
as that is how much space we set aside before the environment, as per
the config file.
.. code-block:: text
U-Boot # mmc rescan
U-Boot # load mmc 0 ${loadaddr} u-boot.bin
U-Boot # protect off 08000000 +80000
U-Boot # erase 08000000 +80000
U-Boot # cp.b ${loadaddr} 08000000 ${filesize}
Falcon Mode
-----------