linux-kernel - [PATCH] microblaze: Increase max dtb size to 64K from 32K

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Message-Id: <051fa6cf19fac4ae7029ac9e85fe12caa29b4011.1570530267.git.michal.simek@xilinx.com>
Date:   Tue,  8 Oct 2019 12:24:37 +0200
From:   Michal Simek <michal.simek@...inx.com>
To:     linux-kernel@...r.kernel.org, monstr@...str.eu,
        michal.simek@...inx.com, git@...inx.com
Cc:     Siva Durga Prasad Paladugu <siva.durga.paladugu@...inx.com>,
        Casey Schaufler <casey@...aufler-ca.com>,
        James Morris <james.morris@...rosoft.com>,
        John Johansen <john.johansen@...onical.com>,
        Kees Cook <keescook@...omium.org>
Subject: [PATCH] microblaze: Increase max dtb size to 64K from 32K

From: Siva Durga Prasad Paladugu <siva.durga.paladugu@...inx.com>

This patch increases max dtb size to 64K from 32K. This fixes the issue  of
kernel hang with larger dtb of size greater than 32KB.

Signed-off-by: Siva Durga Prasad Paladugu <siva.durga.paladugu@...inx.com>
Signed-off-by: Michal Simek <michal.simek@...inx.com>
---

 arch/microblaze/kernel/head.S        | 2 +-
 arch/microblaze/kernel/vmlinux.lds.S | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/microblaze/kernel/head.S b/arch/microblaze/kernel/head.S
index f264fdcf152a..7d2894418691 100644
--- a/arch/microblaze/kernel/head.S
+++ b/arch/microblaze/kernel/head.S
@@ -99,7 +99,7 @@ big_endian:
 _prepare_copy_fdt:
 	or	r11, r0, r0 /* incremment */
 	ori	r4, r0, TOPHYS(_fdt_start)
-	ori	r3, r0, (0x8000 - 4)
+	ori	r3, r0, (0x10000 - 4)
 _copy_fdt:
 	lw	r12, r7, r11 /* r12 = r7 + r11 */
 	sw	r12, r4, r11 /* addr[r4 + r11] = r12 */
diff --git a/arch/microblaze/kernel/vmlinux.lds.S b/arch/microblaze/kernel/vmlinux.lds.S
index e1f3e8741292..71072c5cf61f 100644
--- a/arch/microblaze/kernel/vmlinux.lds.S
+++ b/arch/microblaze/kernel/vmlinux.lds.S
@@ -46,7 +46,7 @@ SECTIONS {
 	__fdt_blob : AT(ADDR(__fdt_blob) - LOAD_OFFSET) {
 		_fdt_start = . ;		/* place for fdt blob */
 		*(__fdt_blob) ;			/* Any link-placed DTB */
-	        . = _fdt_start + 0x8000;	/* Pad up to 32kbyte */
+	        . = _fdt_start + 0x10000;	/* Pad up to 64kbyte */
 		_fdt_end = . ;
 	}
 
-- 
2.17.1