[PATCH v4 1/8] spl: Enforce framebuffer reservation from end of RAM

Devarsh Thakkar devarsht at ti.com
Sat Nov 25 17:26:58 CET 2023


Add an API which enforces framebuffer reservation from end of RAM.
This is done so that next stage can directly skip this region before
carrying out further reservations.

Signed-off-by: Devarsh Thakkar <devarsht at ti.com>
---
V2:
No change.

V3:
Change spl_reserve_video to spl_reserve_video_from_ram_top
which enforce framebuffer reservation from end of RAM.

V4:
Split this to an independent patch with more details added
in comments for API in header file.
---
 common/spl/spl.c | 19 +++++++++++++++++++
 include/spl.h    | 10 ++++++++++
 2 files changed, 29 insertions(+)

diff --git a/common/spl/spl.c b/common/spl/spl.c
index 3ce5bfeec8..b65c439e7a 100644
--- a/common/spl/spl.c
+++ b/common/spl/spl.c
@@ -42,6 +42,7 @@
 #include <fdt_support.h>
 #include <bootcount.h>
 #include <wdt.h>
+#include <video.h>
 
 DECLARE_GLOBAL_DATA_PTR;
 DECLARE_BINMAN_MAGIC_SYM;
@@ -152,6 +153,24 @@ void spl_fixup_fdt(void *fdt_blob)
 #endif
 }
 
+int spl_reserve_video_from_ram_top(void)
+{
+	if (CONFIG_IS_ENABLED(VIDEO)) {
+		ulong addr;
+		int ret;
+
+		addr = gd->ram_top;
+		ret = video_reserve(&addr);
+		if (ret)
+			return ret;
+		debug("Reserving %luk for video at: %08lx\n",
+		      ((unsigned long)gd->relocaddr - addr) >> 10, addr);
+		gd->relocaddr = addr;
+	}
+
+	return 0;
+}
+
 ulong spl_get_image_pos(void)
 {
 	if (!CONFIG_IS_ENABLED(BINMAN_UBOOT_SYMBOLS))
diff --git a/include/spl.h b/include/spl.h
index 0952188901..043875f10f 100644
--- a/include/spl.h
+++ b/include/spl.h
@@ -889,6 +889,16 @@ int spl_usb_load(struct spl_image_info *spl_image,
 
 int spl_ymodem_load_image(struct spl_image_info *spl_image,
 			  struct spl_boot_device *bootdev);
+/**
+ * spl_reserve_video_from_ram_top() - Reserve framebuffer memory from end of RAM
+ *
+ * This enforces framebuffer reservation at SPL stage from end of RAM so that
+ * next stage can directly skip this pre-reserved area before carrying out
+ * further reservations. The allocation address is stored in struct video_uc_plat.
+ *
+ * Return: 0 on success, otherwise error code
+ */
+int spl_reserve_video_from_ram_top(void);
 
 /**
  * spl_invoke_atf - boot using an ARM trusted firmware image
-- 
2.34.1



More information about the U-Boot mailing list