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QEMU i486: Minor updates to VGA driver

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This commit is contained in:
Gregory Nutt 2014-03-08 10:56:19 -06:00
parent 497939da0f
commit c86c40f4e4
2 changed files with 9 additions and 0 deletions
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6
arch/x86/src/qemu/Kconfig
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@ -19,4 +19,10 @@ config QEMU_VGA
---help--- ---help---
Enable support for the QEMU VGA. See qemu_vga.h for interfaces. Enable support for the QEMU VGA. See qemu_vga.h for interfaces.
NOTE: This VGA driver exports a character driver that can be used
to write into the VGA framebuffer. It does *NOT* support a NuttX
framebuffer interfaces and, hence, cannot be used with the NuttX
graphics subsystem. Such a conversion to the standard NuttX
framebuffer interface would, however, not be a big job.
endif endif

3
arch/x86/src/qemu/qemu_vga.c
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@ -458,6 +458,9 @@ static off_t vga_seek(FAR struct file *filp, off_t offset, int whence)
case SEEK_END: /* From the end of the file */ case SEEK_END: /* From the end of the file */
newpos = (VGA_FBSIZE - 1) - offset; newpos = (VGA_FBSIZE - 1) - offset;
break; break;
default:
return g_curpos;
} }
/* Make sure that the new cursor position lies within the frame buffer */ /* Make sure that the new cursor position lies within the frame buffer */