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firmware: Split RO/RX and RW sections

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Split the RO/RX and RW sections so that they can have
independent pmp entries with required permissions. The
split size is ensured to be a power-of-2 as required by
pmp.

_fw_rw_offset symbol marks the beginning of the data
section.

Signed-off-by: Himanshu Chauhan <hchauhan@ventanamicro.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
This commit is contained in:
Himanshu Chauhan
2023-01-19 20:48:22 +05:30
committed by Anup Patel
parent a990309fa3
commit fefa548803
1 changed files with 8 additions and 0 deletions
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8
firmware/fw_base.ldS
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@@ -42,6 +42,14 @@
. = ALIGN(0x1000); /* Ensure next section is page aligned */ . = ALIGN(0x1000); /* Ensure next section is page aligned */
/*
* PMP regions must be to be power-of-2. RO/RW will have separate
* regions, so ensure that the split is power-of-2.
*/
. = ALIGN(1 << LOG2CEIL(SIZEOF(.rodata) + SIZEOF(.text)));
PROVIDE(_fw_rw_offset = (. - _fw_start));
/* Beginning of the read-write data sections */ /* Beginning of the read-write data sections */
.data : .data :