summaryrefslogtreecommitdiff
path: root/doc/README.fsl-ddr
diff options
context:
space:
mode:
Diffstat (limited to 'doc/README.fsl-ddr')
-rw-r--r--doc/README.fsl-ddr7
1 files changed, 7 insertions, 0 deletions
diff --git a/doc/README.fsl-ddr b/doc/README.fsl-ddr
index 3992640..59583b3 100644
--- a/doc/README.fsl-ddr
+++ b/doc/README.fsl-ddr
@@ -268,6 +268,13 @@ be activated by saving an environment variable "ddr_interactive". The value
doesn't matter. Once activated, U-boot prompts "FSL DDR>" before enabling DDR
controller. The available commands can be seen by typing "help".
+Another way to enter debug mode without using environment variable is to send
+a key press during boot, like one would do to abort auto boot. To save booting
+time, no additioal delay is added so the window to send the key press is very
+short. For example, user can send the key press using reset command followed by
+hitting enter key twice. In case of power on reset, user can keep hitting any
+key while applying the power.
+
The example flow of using interactive debugging is
type command "compute" to calculate the parameters from the default
type command "print" with arguments to show SPD, options, registers