From: Simon Glass <sjg@chromium.org>
The 'pager' environment variable can be used to set the number of lines
on the display. Provide a callback for this.
Signed-off-by: Simon Glass <sjg@chromium.org>
---
common/pager.c | 28 ++++++++++++++++++++++++++++
doc/usage/environment.rst | 3 +++
include/env_callback.h | 7 +++++++
3 files changed, 38 insertions(+)
@@ -7,6 +7,7 @@
#define LOG_CATEGORY LOGC_CONSOLE
+#include <env.h>
#include <errno.h>
#include <malloc.h>
#include <pager.h>
@@ -156,6 +157,33 @@ void pager_reset(struct pager *pag)
pag->line_count = 0;
}
+static int on_pager(const char *name, const char *value, enum env_op op,
+ int flags)
+{
+ struct pager *pag = gd_pager();
+ int new_page_len;
+
+ if (!IS_ENABLED(CONFIG_CONSOLE_PAGER) || !pag)
+ return 0;
+
+ switch (op) {
+ case env_op_create:
+ case env_op_overwrite:
+ if (value) {
+ new_page_len = simple_strtoul(value, NULL, 16);
+ pager_set_page_len(pag, new_page_len);
+ }
+ break;
+ case env_op_delete:
+ /* Reset to default when deleted */
+ pager_set_page_len(pag, CONFIG_CONSOLE_PAGER_LINES);
+ break;
+ }
+
+ return 0;
+}
+U_BOOT_ENV_CALLBACK(pager, on_pager);
+
int pager_init(struct pager **pagp, int page_len, int buf_size)
{
struct pager *pag;
@@ -335,6 +335,9 @@ netretry
Useful on scripts which control the retry operation
themselves.
+pager
+ Decimal number of visible lines on the display, or serial console.
+
rng_seed_size
Size of random value added to device-tree node /chosen/rng-seed.
This variable is given as a decimal number.
@@ -75,6 +75,12 @@
#define DFU_CALLBACK
#endif
+#ifdef CONFIG_CONSOLE_PAGER
+#define PAGER_CALLBACK "pager:pager,"
+#else
+#define PAGER_CALLBACK
+#endif
+
/*
* This list of callback bindings is static, but may be overridden by defining
* a new association in the ".callbacks" environment variable.
@@ -88,6 +94,7 @@
DFU_CALLBACK \
"loadaddr:loadaddr," \
SILENT_CALLBACK \
+ PAGER_CALLBACK \
"stdin:console,stdout:console,stderr:console," \
"serial#:serialno," \
CFG_ENV_CALLBACK_LIST_STATIC