Merge tag 'u-boot-imx-20210809' of https://source.denx.de/u-boot/custodians/u-boot-imx

[platform/kernel/u-boot.git] / doc / README.update

diff --git a/doc/README.update b/doc/README.update
index a476002..bf43792 100644 (file)
--- a/doc/README.update
+++ b/doc/README.update
@@ -39,11 +39,11 @@ The auto-update feature uses the following configuration knobs:
   These knobs control the timeouts during initial connection to the TFTP
   server. Since a transfer is attempted during each boot, it is undesirable to
   have a long delay when a TFTP server is not present.
-  CONFIG_UPDATE_TFTP_MSEC_MAX specifies the number of seconds to wait for the
-  server to respond to initial connection, and CONFIG_UPDATE_TFTP_CNT_MAX
+  CONFIG_UPDATE_TFTP_MSEC_MAX specifies the number of milliseconds to wait for
+  the server to respond to initial connection, and CONFIG_UPDATE_TFTP_CNT_MAX
   gives the number of such connection retries. CONFIG_UPDATE_TFTP_CNT_MAX must
   be non-negative and is 0 by default, CONFIG_UPDATE_TFTP_MSEC_MAX must be
-  positive and is 1 by default.
+  positive and is 100 by default.
 
 Since the update file is in FIT format, it is created from an *.its file using
 the mkimage tool. dtc tool with support for binary includes, e.g. in version
@@ -88,3 +88,10 @@ Example .its files
   An example containing three updates. It can be used to update Linux kernel,
   ramdisk and FDT blob stored in Flash. The procedure for preparing the update
   file is similar to the example above.
+
+TFTP update via DFU
+-------------------
+
+- It is now possible to update firmware (bootloader, kernel, rootfs, etc.) via
+  TFTP by using DFU (Device Firmware Upgrade). More information can be found in
+  ./doc/README.dfutftp documentation entry.