[U-Boot] [PATCH v5 01/11] armv8: Add global variable resv_ram

[York Sun]

Use gd->arch.resv_ram to track reserved memory allocation.

Signed-off-by: York Sun <york.sun at nxp.com>

---

Changes in v5:
  Rename RESV_RAM_TOP to RESV_RAM in Kconfig
  Revise "help" message and add comment to explain how RESV_RAM is used.

Changes in v4: None
Changes in v3: None
Changes in v2: None

 arch/arm/cpu/armv8/fsl-layerscape/Kconfig | 10 ++++++++++
 arch/arm/include/asm/global_data.h        |  7 +++++++
 cmd/bdinfo.c                              |  4 ++++
 3 files changed, 21 insertions(+)

diff --git a/arch/arm/cpu/armv8/fsl-layerscape/Kconfig b/arch/arm/cpu/armv8/fsl-layerscape/Kconfig
index adccdf1..3f3ccc7 100644
--- a/arch/arm/cpu/armv8/fsl-layerscape/Kconfig
+++ b/arch/arm/cpu/armv8/fsl-layerscape/Kconfig
@@ -273,6 +273,16 @@ config SYS_FSL_SDHC_CLK_DIV
 	  clock, in another word SDHC_clk = Platform_clk / this_divider.
 endmenu
 
+config RESV_RAM
+	bool
+	help
+	  Reserve memory from the top, tracked by gd->arch.resv_ram. This
+	  reserved RAM can be used by special driver that resides in memory
+	  after U-Boot exits. It's up to implementation to allocate and allow
+	  access to this reserved memory. For example, the reserved RAM can
+	  be at the high end of physical memory. The reserve RAM may be
+	  excluded from memory bank(s) passed to OS, or marked as reserved.
+
 config SYS_FSL_ERRATUM_A008336
 	bool
 
diff --git a/arch/arm/include/asm/global_data.h b/arch/arm/include/asm/global_data.h
index aee87cd..dfcbcce 100644
--- a/arch/arm/include/asm/global_data.h
+++ b/arch/arm/include/asm/global_data.h
@@ -59,6 +59,13 @@ struct arch_global_data {
 	phys_addr_t secure_ram;
 	unsigned long tlb_allocated;
 #endif
+#ifdef CONFIG_RESV_RAM
+	/*
+	 * Reserved RAM for memory resident, eg. Management Complex (MC)
+	 * driver which continues to run after U-Boot exits.
+	 */
+	phys_addr_t resv_ram;
+#endif
 
 #ifdef CONFIG_ARCH_OMAP2
 	u32 omap_boot_device;
diff --git a/cmd/bdinfo.c b/cmd/bdinfo.c
index ae3027a..19b8fd8 100644
--- a/cmd/bdinfo.c
+++ b/cmd/bdinfo.c
@@ -392,6 +392,10 @@ static int do_bdinfo(cmd_tbl_t *cmdtp, int flag, int argc,
 			  gd->arch.secure_ram & MEM_RESERVE_SECURE_ADDR_MASK);
 	}
 #endif
+#ifdef CONFIG_RESV_RAM
+	if (gd->arch.resv_ram)
+		print_num("Reserved ram", gd->arch.resv_ram);
+#endif
 #if defined(CONFIG_CMD_NET) && !defined(CONFIG_DM_ETH)
 	print_eths();
 #endif
-- 
2.7.4