This patch will create a configuration option for a minimum configuration for
the ns16550 serial driver at drivers/serial/ns16550.c which will exclude all
functions with exception of NS16550_putc and NS16550_init. This will be used
primarily to save space and remove unused code from builds in which space is
limited.
Signed-off-by: Ron Madrid <ron_mad...@sbcglobal.net>
---
README | 7 +++++++
drivers/serial/ns16550.c | 4 ++++
2 files changed, 11 insertions(+), 0 deletions(-)
diff --git a/README b/README
index 132650e..84e30da 100644
--- a/README
+++ b/README
@@ -2434,6 +2434,13 @@ use the "saveenv" command to store a valid environment.
- CONFIG_SYS_64BIT_STRTOUL:
Adds simple_strtoull that returns a 64bit value
+- CONFIG_SYS_NS16550_MIN_FUNCTIONS:
+ Define this if you desire to only have use of the NS16550_init
+ and NS16550_putc functions for the serial driver located at
+ drivers/serial/ns16550.c. This option is useful for saving
+ space for already greatly restricted images, including but not
+ limited to NAND_SPL configurations.
+
Low Level (hardware related) configuration options:
---------------------------------------------------
diff --git a/drivers/serial/ns16550.c b/drivers/serial/ns16550.c
index 93c2243..67a42b6 100644
--- a/drivers/serial/ns16550.c
+++ b/drivers/serial/ns16550.c
@@ -39,6 +39,7 @@ void NS16550_init (NS16550_t com_port, int baud_divisor)
#endif
}
+#ifndef CONFIG_SYS_NS16550_MIN_FUNCTIONS
void NS16550_reinit (NS16550_t com_port, int baud_divisor)
{
com_port->ier = 0x00;
@@ -53,6 +54,7 @@ void NS16550_reinit (NS16550_t com_port, int baud_divisor)
com_port->dlm = (baud_divisor >> 8) & 0xff;
com_port->lcr = LCRVAL;
}
+#endif /* CONFIG_SYS_NS16550_MIN_FUNCTIONS */
void NS16550_putc (NS16550_t com_port, char c)
{
@@ -60,6 +62,7 @@ void NS16550_putc (NS16550_t com_port, char c)
com_port->thr = c;
}
+#ifndef CONFIG_SYS_NS16550_MIN_FUNCTIONS
char NS16550_getc (NS16550_t com_port)
{
while ((com_port->lsr & LSR_DR) == 0) {
@@ -76,4 +79,5 @@ int NS16550_tstc (NS16550_t com_port)
return ((com_port->lsr & LSR_DR) != 0);
}
+#endif /* CONFIG_SYS_NS16550_MIN_FUNCTIONS */
#endif
--
1.5.5.1
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