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feat(tc): pass the DTB address to BL33 in R0

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The DTB that tf-a loads is already used in BL33 directly with the
address hardcoded. As this address is prone to changing, pass it forward
so we can avoid breakage in the future.

Signed-off-by: Boyan Karatotev <boyan.karatotev@arm.com>
Change-Id: I7a42f72ecc00814b9f0a4bf5605d70cb53ce2ff4
This commit is contained in:
Boyan Karatotev 2023-11-29 15:27:18 +00:00
parent 4fc4e9c969
commit 638e4a92d8
1 changed files with 20 additions and 1 deletions
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21
plat/arm/board/tc/tc_bl31_setup.c
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@ -1,5 +1,5 @@
/*
* Copyright (c) 2020-2023, Arm Limited and Contributors. All rights reserved.
* Copyright (c) 2020-2024, Arm Limited and Contributors. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
@ -75,6 +75,25 @@ scmi_channel_plat_info_t *plat_css_get_scmi_info(unsigned int channel_id)
void bl31_early_platform_setup2(u_register_t arg0, u_register_t arg1,
u_register_t arg2, u_register_t arg3)
{
/*
* Pass the hw_config to BL33 in R0. You'll notice that
* arm_bl31_early_platform_setup does something similar but only behind
* ARM_LINUX_KERNEL_AS_BL33 and we want to pass the DTB even to a
* bootloader. Lucky for us, it copies the ep_info BL2 gave us to BL33
* unconditionally in the generic case so hijack that.
* TODO: this goes away with firmware handoff when it will be proper
*/
bl_params_node_t *bl_params = ((bl_params_t *)arg0)->head;
while (bl_params != NULL) {
if (bl_params->image_id == BL33_IMAGE_ID) {
bl_params->ep_info->args.arg0 = arg2;
break;
}
bl_params = bl_params->next_params_info;
}
arm_bl31_early_platform_setup((void *)arg0, arg1, arg2, (void *)arg3);
/* Fill the properties struct with the info from the config dtb */