40 lines
1.4 KiB
Diff
40 lines
1.4 KiB
Diff
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From 40b65e95cfebc9d9af61d3c47562cdeb6b2a1302 Mon Sep 17 00:00:00 2001
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From: Samuel Holland <samuel@sholland.org>
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Date: Sat, 17 Apr 2021 10:43:58 -0500
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Subject: [PATCH 06/10] sunxi: Load sun8i secure monitor to SRAM A2
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Most sun6i-derived SoCs contain SRAM A2, a secure SRAM area for ARISC
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SCP firmware. H3 has a smaller SRAM than other SoCs (A31/A33/A23/A83T).
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On sun8i SoCs which do not have SRAM B, we can use part of this SRAM for
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the secure monitor. Follow the design of 64-bit SoCs and use the first
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part for the monitor, and the last 16 KiB for the SCP firmware. With
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this change, the monitor no longer needs to reserve a region in DRAM.
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Signed-off-by: Samuel Holland <samuel@sholland.org>
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---
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include/configs/sun8i.h | 7 +++++++
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1 file changed, 7 insertions(+)
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diff --git a/include/configs/sun8i.h b/include/configs/sun8i.h
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index 27c9808a49..3466c75e28 100644
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--- a/include/configs/sun8i.h
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+++ b/include/configs/sun8i.h
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@@ -22,6 +22,13 @@
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#define CONFIG_ARMV7_SECURE_MAX_SIZE (SUNXI_SRAM_A2_SIZE - 33 * 1024)
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#endif
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+/*
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+ * Skip the first 16 KiB of SRAM A2, which is not usable, as only certain bytes
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+ * are writable. Reserve the last 17 KiB for the resume shim and SCP firmware.
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+ */
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+#define CONFIG_ARMV7_SECURE_BASE (SUNXI_SRAM_A2_BASE + 16 * 1024)
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+#define CONFIG_ARMV7_SECURE_MAX_SIZE (SUNXI_SRAM_A2_SIZE - 33 * 1024)
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+
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/*
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* Include common sunxi configuration where most the settings are
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*/
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--
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2.31.1
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