upstream u-boot with additional patches for our devices/boards: https://lists.denx.de/pipermail/u-boot/2017-March/282789.html (AXP crashes) ; Gbit ethernet patch for some LIME2 revisions ; with SPI flash support
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u-boot/doc/SPI
Marek Vasut df155672ff spi: altera: Add short note about EPCS/EPCQx1 10 years ago
..
README.altera_spi spi: altera: Add short note about EPCS/EPCQx1 10 years ago
README.dual-flash sf: Add dual memories support - DUAL_PARALLEL 11 years ago
README.ftssp010_spi_test spi: Add Faraday SPI controller support 11 years ago
README.sandbox-spi sandbox: spi: Add new SPI flash driver 11 years ago
README.sh_qspi_test spi: Add support SH Quad SPI driver 11 years ago
README.ti_qspi_am43x_test doc: SPI: Add qspi test details on AM43xx 11 years ago
README.ti_qspi_dra_test
README.ti_qspi_flash
status.txt doc: SPI: Update status.txt 11 years ago

README.ti_qspi_flash

QSPI U-boot support
------------------

Host processor is connected to serial flash device via qpsi
interface. QSPI is a kind of spi module that allows single,
dual and quad read access to external spi devices. The module
has a memory mapped interface which provide direct interface
for accessing data form external spi devices.

The one QSPI in the device is primarily intended for fast booting
from Quad SPI flash devices.

Usecase
-------

MLO/u-boot.img will be flashed from SD/MMC to the flash device
using serial flash erase and write commands. Then, switch settings
will be changed to qspi boot. Then, the ROM code will read MLO
from the predefined location in the flash, where it was flashed and
execute it after storing it in SDRAM. Then, the MLO will read
u-boot.img from flash and execute it from SDRAM.

SPI mode
-------
SPI mode uses mtd spi framework for transfer and reception of data.
Can be used in:
1. Normal mode: use single pin for transfers
2. Dual Mode: use two pins for transfers.
3. Quad mode: use four pin for transfer

Memory mapped read mode
-----------------------
In this, SPI controller is configured using configuration port and then
controler is switched to memory mapped port for data read.

Driver
------
drivers/qspi/ti_qspi.c
- Newly created file which is responsible for configuring the
qspi controller and also for providing the low level api which
is responsible for transferring the datas from host controller
to flash device and vice versa.

Testing
-------
A seperated file named README.dra_qspi_test has been created which gives all the
details about the commands required to test qspi at u-boot level.