fbcon: logo: disable logo at boot
Add logo.nologo kernel boot option to disable the logo in order to provide
more screen space for kernel messages; especially useful when debugging and
screen space is more critical.
newport_con driver changes are untested.
[akpm@linux-foundation.org: cleanups, coding-style fixes]
Signed-off-by: Randy Dunlap <rdunlap@xenotime.net>
Signed-off-by: Antonino Daplas <adaplas@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 760ed57..eb24799 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -911,6 +911,11 @@
n must be a power of two. The default size
is set in the kernel config file.
+ logo.nologo [FB] Disables display of the built-in Linux logo.
+ This may be used to provide more screen space for
+ kernel log messages and is useful when debugging
+ kernel boot problems.
+
lp=0 [LP] Specify parallel ports to use, e.g,
lp=port[,port...] lp=none,parport0 (lp0 not configured, lp1 uses
lp=reset first parallel port). 'lp=0' disables the
diff --git a/drivers/video/console/newport_con.c b/drivers/video/console/newport_con.c
index dda0586..f57d7b2 100644
--- a/drivers/video/console/newport_con.c
+++ b/drivers/video/console/newport_con.c
@@ -98,14 +98,19 @@
}
}
-static void newport_show_logo(void)
+static struct linux_logo *newport_show_logo(void)
{
#ifdef CONFIG_LOGO_SGI_CLUT224
const struct linux_logo *logo = fb_find_logo(8);
- const unsigned char *clut = logo->clut;
- const unsigned char *data = logo->data;
+ const unsigned char *clut;
+ const unsigned char *data;
unsigned long i;
+ if (!logo)
+ return NULL;
+ *clut = logo->clut;
+ *data = logo->data;
+
for (i = 0; i < logo->clutsize; i++) {
newport_bfwait(npregs);
newport_cmap_setaddr(npregs, i + 0x20);
@@ -123,6 +128,8 @@
for (i = 0; i < logo->width*logo->height; i++)
npregs->go.hostrw0 = *data++ << 24;
+
+ return logo;
#endif /* CONFIG_LOGO_SGI_CLUT224 */
}
@@ -465,9 +472,10 @@
npregs->cset.topscan = 0x3ff;
if (!logo_drawn) {
- newport_show_logo();
- logo_drawn = 1;
- logo_active = 1;
+ if (newport_show_logo()) {
+ logo_drawn = 1;
+ logo_active = 1;
+ }
}
return 1;
diff --git a/drivers/video/logo/logo.c b/drivers/video/logo/logo.c
index 2b0f799..a9283ba 100644
--- a/drivers/video/logo/logo.c
+++ b/drivers/video/logo/logo.c
@@ -34,6 +34,10 @@
extern const struct linux_logo logo_superh_clut224;
extern const struct linux_logo logo_m32r_clut224;
+static int nologo;
+module_param(nologo, bool, 0);
+MODULE_PARM_DESC(nologo, "Disables startup logo");
+
/* logo's are marked __initdata. Use __init_refok to tell
* modpost that it is intended that this function uses data
* marked __initdata.
@@ -42,6 +46,9 @@
{
const struct linux_logo *logo = NULL;
+ if (nologo)
+ return NULL;
+
if (depth >= 1) {
#ifdef CONFIG_LOGO_LINUX_MONO
/* Generic Linux logo */