From: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
To: u-boot@lists.denx.de
Subject: [U-Boot] [PATCH 5/9] MIPS: add possibility to setup initial stack and global data in SRAM
Date: Sun, 25 Sep 2016 20:05:28 +0200 [thread overview]
Message-ID: <20160925180532.19800-6-daniel.schwierzeck@gmail.com> (raw)
In-Reply-To: <20160925180532.19800-1-daniel.schwierzeck@gmail.com>
This adds a new Kconfig option CONFIG_MIPS_INIT_STACK_IN_SRAM which
a SoC can select if it supports some kind of SRAM. Together with
CONFIG_SYS_INIT_SP_ADDR the initial stack and global data can be
set up in that SRAM. This can be used to provide a C environment
also for lowlevel_init().
Signed-off-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
---
arch/mips/Kconfig | 11 +++++++++++
arch/mips/cpu/start.S | 7 +++++++
2 files changed, 18 insertions(+)
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index 709ac5c..d97930e 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -302,6 +302,17 @@ config SWAP_IO_SPACE
config SYS_MIPS_CACHE_INIT_RAM_LOAD
bool
+config MIPS_INIT_STACK_IN_SRAM
+ bool
+ default n
+ help
+ Select this if the initial stack frame could be setup in SRAM.
+ Normally the initial stack frame is set up in DRAM which is often
+ only available after lowlevel_init. With this option the initial
+ stack frame and the early C environment is set up before
+ lowlevel_init. Thus lowlevel_init does not need to be implemented
+ in assembler.
+
config SYS_DCACHE_SIZE
int
default 0
diff --git a/arch/mips/cpu/start.S b/arch/mips/cpu/start.S
index ee9de99..3af571c 100644
--- a/arch/mips/cpu/start.S
+++ b/arch/mips/cpu/start.S
@@ -226,6 +226,11 @@ wr_done:
nop
#endif
+#ifdef CONFIG_MIPS_INIT_STACK_IN_SRAM
+ /* Set up initial stack and global data */
+ setup_stack_gd
+#endif
+
#ifndef CONFIG_SKIP_LOWLEVEL_INIT
# ifdef CONFIG_SYS_MIPS_CACHE_INIT_RAM_LOAD
/* Initialize any external memory */
@@ -247,8 +252,10 @@ wr_done:
# endif
#endif
+#ifndef CONFIG_MIPS_INIT_STACK_IN_SRAM
/* Set up initial stack and global data */
setup_stack_gd
+#endif
move a0, zero # a0 <-- boot_flags = 0
PTR_LA t9, board_init_f
--
2.9.3
next prev parent reply other threads:[~2016-09-25 18:05 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-09-25 18:05 [U-Boot] [PATCH 0/9] MIPS: improve start.S and add exception support Daniel Schwierzeck
2016-09-25 18:05 ` [U-Boot] [PATCH 1/9] MIPS: make inclusion of ROM exception vectors configurable Daniel Schwierzeck
2016-09-25 18:05 ` [U-Boot] [PATCH 2/9] MIPS: fix ROM exception vectors Daniel Schwierzeck
2016-09-26 7:58 ` Matthew Fortune
2016-09-26 17:45 ` Daniel Schwierzeck
2016-09-26 19:03 ` Matthew Fortune
2016-09-25 18:05 ` [U-Boot] [PATCH 3/9] MIPS: fix iand optimize setup of CP0 registers Daniel Schwierzeck
2016-09-25 18:05 ` [U-Boot] [PATCH 4/9] MIPS: factor out code for initial stack and global data Daniel Schwierzeck
2016-09-25 18:05 ` Daniel Schwierzeck [this message]
2016-09-25 18:05 ` [U-Boot] [PATCH 6/9] MIPS: add asm-offsets for struct pt_regs Daniel Schwierzeck
2016-09-25 18:05 ` [U-Boot] [PATCH 7/9] MIPS: reserve space for exception vectors Daniel Schwierzeck
2016-09-25 18:05 ` [U-Boot] [PATCH 8/9] MIPS: add handling for generic and EJTAG exceptions Daniel Schwierzeck
2016-09-26 10:29 ` Paul Burton
2016-09-26 17:41 ` Daniel Schwierzeck
2016-09-26 18:15 ` Paul Burton
2016-09-25 18:05 ` [U-Boot] [PATCH 9/9] common/board_f: enable initr_trap for MIPS Daniel Schwierzeck
2016-09-27 0:34 ` Simon Glass
2016-09-26 7:52 ` [U-Boot] [PATCH 0/9] MIPS: improve start.S and add exception support Matthew Fortune
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