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README: davinci: Clarify when SPL is used and the target devices. 

The documentation states that SPL is enabled in all config options
for the da850.  This incorrect, because devices booting from NOR
do not need the SPL to do the low level initializion because when
booting from NOR, the board is able to execute in place (XIP)

This also clarifies that SPL isn't only used for booting from SPI,
because it is also used for booting from MMC and NAND for those
devices supporting those boot options.

Signed-off-by: Adam Ford <aford173@gmail.com>
This commit is contained in:
Adam Ford 2020-06-29 18:32:02 -05:00 committed by Lokesh Vutla
parent 3f09ebfbde
commit 5f1600e03e
1 changed files with 7 additions and 3 deletions
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10
doc/README.davinci
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@ -37,11 +37,15 @@ Bootloaders
===============
For DA850 an SPL (secondary program loader, see doc/README.SPL) is provided
to load U-Boot directly from SPI flash. The SPL takes care of the low level
to load U-Boot from SPI flash, MMC or NAND. The SPL takes care of the low level
initialization.
The SPL is built as u-boot.ais for all DA850 defconfigs. The resulting
image file can be programmed to the SPI flash of the DA850 EVM/LCDK.
The SPL is built as u-boot.ais for all DA850 defconfigs except those booting
from NOR flash. The resulting image file can be programmed to the SPI flash
of the DA850 EVM/LCDK.
Devices that support booting from NOR utilize execute in place (XIP) and do
not require SPL to perform low level initialization.
Environment Variables
=====================