package/boot/uboot-suniv/patches/0001-arm-arm926ejs-start.S-port-save_boot_params-support-.patch

   1 From 1dcc6c61ee650b26b94da4f4d6030d54706d87fe Mon Sep 17 00:00:00 2001
   2 From: Icenowy Zheng <icenowy@aosc.io>
   3 Date: Thu, 18 Jan 2018 23:11:20 +0800
   4 Subject: [PATCH 01/29] arm: arm926ejs: start.S: port save_boot_params support
   5  from armv7 code
   6
   7 The ARMv7 start code has support for saving some boot params at the
   8 entry point, which is used by some SoCs to return to BROM.
   9
  10 Port this to ARM926EJ-S start code.
  11
  12 Signed-off-by: Icenowy Zheng <icenowy@aosc.io>
  13 ---
  14  arch/arm/cpu/arm926ejs/start.S | 19 +++++++++++++++++++
  15  1 file changed, 19 insertions(+)
  16
  17 diff --git a/arch/arm/cpu/arm926ejs/start.S b/arch/arm/cpu/arm926ejs/start.S
  18 index ff592ba810..9011afed3f 100644
  19 --- a/arch/arm/cpu/arm926ejs/start.S
  20 +++ b/arch/arm/cpu/arm926ejs/start.S
  21 @@ -17,6 +17,7 @@
  22  #include <asm-offsets.h>
  23  #include <config.h>
  24  #include <common.h>
  25 +#include <linux/linkage.h>
  26
  27  /*
  28   *************************************************************************
  29 @@ -32,8 +33,13 @@
  30   */
  31
  32         .globl  reset
  33 +       .globl  save_boot_params_ret
  34 +       .type   save_boot_params_ret,%function
  35
  36  reset:
  37 +       /* Allow the board to save important registers */
  38 +       b       save_boot_params
  39 +save_boot_params_ret:
  40         /*
  41          * set the cpu to SVC32 mode
  42          */
  43 @@ -110,3 +116,16 @@ flush_dcache:
  44  #endif
  45         mov     pc, lr          /* back to my caller */
  46  #endif /* CONFIG_SKIP_LOWLEVEL_INIT */
  47 +
  48 +/*************************************************************************
  49 + *
  50 + * void save_boot_params(u32 r0, u32 r1, u32 r2, u32 r3)
  51 + *     __attribute__((weak));
  52 + *
  53 + * Stack pointer is not yet initialized at this moment
  54 + * Don't save anything to stack even if compiled with -O0
  55 + *
  56 + *************************************************************************/
  57 +WEAK(save_boot_params)
  58 +       b       save_boot_params_ret    /* back to my caller */
  59 +ENDPROC(save_boot_params)
  60 --
  61 2.20.1
  62