From: Tom Rini <trini@konsulko.com>
To: u-boot@lists.denx.de
Subject: [PATCH 1/1] powerpc: Drop version_string placement optimization
Date: Thu, 16 Sep 2021 15:56:48 -0400 [thread overview]
Message-ID: <20210916195648.9424-1-trini@konsulko.com> (raw)
In-Reply-To: <20210802131838.21097-8-pali@kernel.org>
As explained by Wolfgang, historically PowerPC would do a number of
things to hand-optimize placement of the binary on NOR flash in order to
maximize utilization of very scarce resources. These days, we simply
aren't optimizing our binary layout for NOR flash placement and it's
quite likely this wasn't working as intended. Furthermore, this level
of optimization makes it difficult to have version_string be a global,
instead of a weak and overridden value, and so make more progress on
reproducible builds, which is a current concern.
Move to having PowerPC no longer store version_string in the early part
of text so that it might be part of the first page of NOR and instead
use the same declaration everyone else does.
Link: https://lore.kernel.org/r/96716.1629798400@gemini.denx.de/
Signed-off-by: Tom Rini <trini@konsulko.com>
---
arch/powerpc/cpu/mpc83xx/start.S | 7 -------
arch/powerpc/cpu/mpc85xx/start.S | 5 -----
arch/powerpc/cpu/mpc8xx/start.S | 4 ----
3 files changed, 16 deletions(-)
diff --git a/arch/powerpc/cpu/mpc83xx/start.S b/arch/powerpc/cpu/mpc83xx/start.S
index 9da22ce486a9..c4953df4a271 100644
--- a/arch/powerpc/cpu/mpc83xx/start.S
+++ b/arch/powerpc/cpu/mpc83xx/start.S
@@ -13,7 +13,6 @@
#include <asm-offsets.h>
#include <config.h>
#include <mpc83xx.h>
-#include <version.h>
#define CONFIG_83XX 1 /* needed for Linux kernel header files*/
@@ -92,12 +91,6 @@
*/
.long 0x27051956 /* U-Boot Magic Number */
- .globl version_string
-version_string:
- .ascii U_BOOT_VERSION_STRING, "\0"
-
- .align 2
-
.globl enable_addr_trans
enable_addr_trans:
/* enable address translation */
diff --git a/arch/powerpc/cpu/mpc85xx/start.S b/arch/powerpc/cpu/mpc85xx/start.S
index f41e82ad189f..aca31b24c079 100644
--- a/arch/powerpc/cpu/mpc85xx/start.S
+++ b/arch/powerpc/cpu/mpc85xx/start.S
@@ -14,7 +14,6 @@
#include <asm-offsets.h>
#include <config.h>
#include <mpc85xx.h>
-#include <version.h>
#include <ppc_asm.tmpl>
#include <ppc_defs.h>
@@ -1138,11 +1137,7 @@ switch_as:
.globl _start
_start:
.long 0x27051956 /* U-BOOT Magic Number */
- .globl version_string
-version_string:
- .ascii U_BOOT_VERSION_STRING, "\0"
- .align 4
.globl _start_cont
_start_cont:
/* Setup the stack in initial RAM,could be L2-as-SRAM or L1 dcache*/
diff --git a/arch/powerpc/cpu/mpc8xx/start.S b/arch/powerpc/cpu/mpc8xx/start.S
index ed735cdee005..0ebb7b33a8bc 100644
--- a/arch/powerpc/cpu/mpc8xx/start.S
+++ b/arch/powerpc/cpu/mpc8xx/start.S
@@ -23,7 +23,6 @@
#include <asm-offsets.h>
#include <config.h>
#include <mpc8xx.h>
-#include <version.h>
#include <ppc_asm.tmpl>
#include <ppc_defs.h>
@@ -62,9 +61,6 @@
*/
.text
.long 0x27051956 /* U-Boot Magic Number */
- .globl version_string
-version_string:
- .ascii U_BOOT_VERSION_STRING, "\0"
. = EXC_OFF_SYS_RESET
.globl _start
--
2.17.1
next prev parent reply other threads:[~2021-09-16 19:57 UTC|newest]
Thread overview: 77+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-02 13:18 [PATCH 00/11] Reduce usage of timestamp macros Pali Rohár
2021-08-02 13:18 ` [PATCH 01/11] Remove #include <timestamp.h> from files which do not need it Pali Rohár
2021-08-02 13:58 ` Tom Rini
2021-09-23 2:07 ` Tom Rini
2021-08-02 13:18 ` [PATCH 02/11] Remove #include <version.h> " Pali Rohár
2021-08-02 13:58 ` Tom Rini
2021-09-23 2:07 ` Tom Rini
2021-08-02 13:18 ` [PATCH 03/11] efi_loader: Use directly version_string variable Pali Rohár
2021-08-02 20:04 ` Heinrich Schuchardt
2021-08-03 7:37 ` Ilias Apalodimas
2021-09-23 2:07 ` Tom Rini
2021-08-02 13:18 ` [PATCH 04/11] version: Move version_string[] from version.h to version_string.h Pali Rohár
2021-08-02 13:58 ` Tom Rini
2021-09-23 2:08 ` Tom Rini
2021-08-02 13:18 ` [PATCH 05/11] m68k: mcf: Remove overloading version_string Pali Rohár
2021-09-23 2:08 ` Tom Rini
2021-08-02 13:18 ` [PATCH 06/11] version: Put version_string[] variable into section .text_version_string Pali Rohár
2021-08-02 13:58 ` Tom Rini
2021-09-16 17:30 ` [PATCH] xtensa: Put U-Boot version string at correct place by linker script Tom Rini
2021-09-16 19:38 ` Francesco Dolcini
2021-09-16 19:42 ` Tom Rini
2021-09-16 19:50 ` Francesco Dolcini
2021-09-16 20:13 ` Tom Rini
2021-09-16 20:23 ` Francesco Dolcini
2021-09-17 5:21 ` Max Filippov
2021-09-17 12:02 ` Tom Rini
2021-09-17 5:14 ` Max Filippov
2021-09-17 12:04 ` Tom Rini
2021-09-17 12:30 ` Max Filippov
2021-08-02 13:18 ` [PATCH 07/11] powerpc: mpc: " Pali Rohár
2021-08-08 11:20 ` [PATCH v2] " Pali Rohár
2021-08-08 11:36 ` Pali Rohár
2021-08-24 5:03 ` Christophe Leroy
2021-08-24 9:46 ` Wolfgang Denk
2021-08-24 5:28 ` Christophe Leroy
2021-08-24 11:28 ` Pali Rohár
2021-09-16 19:17 ` Tom Rini
2021-09-16 19:56 ` Tom Rini [this message]
2021-09-23 2:09 ` [PATCH 1/1] powerpc: Drop version_string placement optimization Tom Rini
2021-08-02 13:18 ` [PATCH 08/11] version: Do not make version_string[] variable as a weak Pali Rohár
2021-08-02 13:58 ` Tom Rini
2021-09-23 2:08 ` Tom Rini
2021-08-02 13:18 ` [PATCH 09/11] x86: quark: MRC: Remove U_BOOT_DATE and U_BOOT_TIME from debug log Pali Rohár
2021-08-02 19:21 ` Simon Glass
2021-08-02 23:25 ` Bin Meng
2021-09-23 2:08 ` Tom Rini
2021-08-02 13:18 ` [PATCH 10/11] version: Remove global macro U_BOOT_VERSION_STRING from version.h Pali Rohár
2021-08-02 13:59 ` Tom Rini
2021-09-23 2:08 ` Tom Rini
2021-08-02 13:18 ` [PATCH 11/11] Remove including timestamp.h in version.h Pali Rohár
2021-08-02 19:21 ` Simon Glass
2021-08-02 19:42 ` Pali Rohár
2021-08-02 21:31 ` Tom Rini
2021-08-04 5:59 ` Wolfgang Denk
2021-08-04 12:44 ` Tom Rini
2021-08-04 14:36 ` Simon Glass
2021-08-04 14:40 ` Tom Rini
2021-08-04 21:46 ` Pali Rohár
2021-08-04 21:43 ` Sean Anderson
2021-08-04 21:52 ` Pali Rohár
2021-08-04 22:09 ` Tom Rini
2021-08-04 22:14 ` Pali Rohár
2021-08-04 22:15 ` Tom Rini
2021-08-04 22:22 ` Pali Rohár
2021-09-23 2:08 ` Tom Rini
2021-08-17 11:02 ` [PATCH 00/11] Reduce usage of timestamp macros Pali Rohár
2021-08-17 13:40 ` Tom Rini
2021-09-01 20:59 ` Tom Rini
2021-09-01 21:05 ` Pali Rohár
2021-09-01 21:17 ` Tom Rini
2021-09-01 21:28 ` Pali Rohár
2021-09-01 21:33 ` Tom Rini
2021-09-01 21:44 ` Pali Rohár
2021-09-01 21:49 ` Pali Rohár
2021-09-10 20:56 ` Pali Rohár
2021-09-10 21:18 ` Tom Rini
2021-09-01 21:56 ` Tom Rini
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