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_madrid@sbcglobal.net --- README | 7 +++++++ drivers/serial/ns16550.c | 4 ++++ 2 files changed, 11 insertions(+), 0 deletions(-)
diff --git a/README b/README index 132650e..afea6a6 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_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..1b347e9 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_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_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_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_NS16550_MIN_FUNCTIONS */ #endif