From fefa5488038584a6376a8f361e74ccc2183dd50b Mon Sep 17 00:00:00 2001 From: Himanshu Chauhan Date: Thu, 19 Jan 2023 20:48:22 +0530 Subject: [PATCH] firmware: Split RO/RX and RW sections 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 Reviewed-by: Anup Patel --- firmware/fw_base.ldS | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/firmware/fw_base.ldS b/firmware/fw_base.ldS index 563ae25..5411bbd 100644 --- a/firmware/fw_base.ldS +++ b/firmware/fw_base.ldS @@ -42,6 +42,14 @@ . = 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 */ .data : -- 2.7.4