| Message ID | 20210916195648.9424-1-trini@konsulko.com |
|---|---|
| State | Accepted |
| Commit | d502c5f3b479fa49b57d255d956d8b9528b64dce |
| Delegated to: | Tom Rini |
| Headers | show |
| Series | [1/1] powerpc: Drop version_string placement optimization | expand |
On Thu, Sep 16, 2021 at 03:56:48PM -0400, Tom Rini wrote: > 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> Applied to u-boot/next, thanks!
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
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(-)