diff options
| author | Simon Glass <sjg@chromium.org> | 2016-05-05 07:28:06 -0600 |
|---|---|---|
| committer | Andreas Bießmann <andreas@biessmann.org> | 2016-06-12 23:49:38 +0200 |
| commit | b5bd09820c79dc92b3e5fb5be4b47ce22c731443 (patch) | |
| tree | 6a5fe76224aed2accdc889e21ae4f5d91c31d4bd /arch | |
| parent | 909584665546ec51c54ac7d362f91fdabaef2cc2 (diff) | |
| download | u-boot-b5bd09820c79dc92b3e5fb5be4b47ce22c731443.zip u-boot-b5bd09820c79dc92b3e5fb5be4b47ce22c731443.tar.gz u-boot-b5bd09820c79dc92b3e5fb5be4b47ce22c731443.tar.bz2 | |
arm: Allow skipping of low-level init with I-cache on
At present CONFIG_SKIP_LOWLEVEL_INIT prevents U-Boot from calling
lowlevel_init(). This means that the instruction cache is not enabled and
the board runs very slowly.
What is really needed in many cases is to skip the call to lowlevel_init()
but still perform CP15 init. Add an option to handle this.
Reviewed-by: Heiko Schocher <hs@denx.de>
Tested-on: smartweb, corvus, taurus, axm
Tested-by: Heiko Schocher <hs@denx.de>
Reviewed-by: Joe Hershberger <joe.hershberger@ni.com>
Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Andreas Bießmann <andreas@biessmann.org>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm/cpu/arm1136/start.S | 2 | ||||
| -rw-r--r-- | arch/arm/cpu/arm920t/start.S | 3 | ||||
| -rw-r--r-- | arch/arm/cpu/arm926ejs/start.S | 2 | ||||
| -rw-r--r-- | arch/arm/cpu/arm946es/start.S | 2 | ||||
| -rw-r--r-- | arch/arm/cpu/armv7/start.S | 5 | ||||
| -rw-r--r-- | arch/arm/cpu/sa1100/start.S | 2 |
6 files changed, 14 insertions, 2 deletions
diff --git a/arch/arm/cpu/arm1136/start.S b/arch/arm/cpu/arm1136/start.S index 3ebdfdd..2f8fd6a 100644 --- a/arch/arm/cpu/arm1136/start.S +++ b/arch/arm/cpu/arm1136/start.S @@ -82,6 +82,7 @@ cpu_init_crit: orr r0, r0, #0x00001000 @ set bit 12 (I) I-Cache mcr p15, 0, r0, c1, c0, 0 +#ifndef CONFIG_SKIP_LOWLEVEL_INIT_ONLY /* * Jump to board specific initialization... The Mask ROM will have already initialized * basic memory. Go here to bump up clock rate and handle wake up conditions. @@ -89,5 +90,6 @@ cpu_init_crit: mov ip, lr /* persevere link reg across call */ bl lowlevel_init /* go setup pll,mux,memory */ mov lr, ip /* restore link */ +#endif mov pc, lr /* back to my caller */ #endif /* CONFIG_SKIP_LOWLEVEL_INIT */ diff --git a/arch/arm/cpu/arm920t/start.S b/arch/arm/cpu/arm920t/start.S index 69cabeb..3ada6d0 100644 --- a/arch/arm/cpu/arm920t/start.S +++ b/arch/arm/cpu/arm920t/start.S @@ -135,6 +135,7 @@ cpu_init_crit: orr r0, r0, #0x00001000 @ set bit 12 (I) I-Cache mcr p15, 0, r0, c1, c0, 0 +#ifndef CONFIG_SKIP_LOWLEVEL_INIT_ONLY /* * before relocating, we have to setup RAM timing * because memory timing is board-dependend, you will @@ -143,7 +144,7 @@ cpu_init_crit: mov ip, lr bl lowlevel_init - mov lr, ip +#endif mov pc, lr #endif /* CONFIG_SKIP_LOWLEVEL_INIT */ diff --git a/arch/arm/cpu/arm926ejs/start.S b/arch/arm/cpu/arm926ejs/start.S index f05113d..959d1ed 100644 --- a/arch/arm/cpu/arm926ejs/start.S +++ b/arch/arm/cpu/arm926ejs/start.S @@ -101,11 +101,13 @@ flush_dcache: #endif mcr p15, 0, r0, c1, c0, 0 +#ifndef CONFIG_SKIP_LOWLEVEL_INIT_ONLY /* * Go setup Memory and board specific bits prior to relocation. */ mov ip, lr /* perserve link reg across call */ bl lowlevel_init /* go setup pll,mux,memory */ mov lr, ip /* restore link */ +#endif mov pc, lr /* back to my caller */ #endif /* CONFIG_SKIP_LOWLEVEL_INIT */ diff --git a/arch/arm/cpu/arm946es/start.S b/arch/arm/cpu/arm946es/start.S index 214cd8c..51053c3 100644 --- a/arch/arm/cpu/arm946es/start.S +++ b/arch/arm/cpu/arm946es/start.S @@ -90,11 +90,13 @@ cpu_init_crit: orr r0, r0, #0x00001000 /* set bit 12 (I) I-Cache */ mcr p15, 0, r0, c1, c0, 0 +#ifndef CONFIG_SKIP_LOWLEVEL_INIT_ONLY /* * Go setup Memory and board specific bits prior to relocation. */ mov ip, lr /* perserve link reg across call */ bl lowlevel_init /* go setup memory */ mov lr, ip /* restore link */ +#endif mov pc, lr /* back to my caller */ #endif diff --git a/arch/arm/cpu/armv7/start.S b/arch/arm/cpu/armv7/start.S index b180944..691e5d3 100644 --- a/arch/arm/cpu/armv7/start.S +++ b/arch/arm/cpu/armv7/start.S @@ -66,8 +66,10 @@ save_boot_params_ret: /* the mask ROM code should have PLL and others stable */ #ifndef CONFIG_SKIP_LOWLEVEL_INIT bl cpu_init_cp15 +#ifndef CONFIG_SKIP_LOWLEVEL_INIT_ONLY bl cpu_init_crit #endif +#endif bl _main @@ -250,7 +252,8 @@ skip_errata_621766: mov pc, r5 @ back to my caller ENDPROC(cpu_init_cp15) -#ifndef CONFIG_SKIP_LOWLEVEL_INIT +#if !defined(CONFIG_SKIP_LOWLEVEL_INIT) && \ + !defined(CONFIG_SKIP_LOWLEVEL_INIT_ONLY) /************************************************************************* * * CPU_init_critical registers diff --git a/arch/arm/cpu/sa1100/start.S b/arch/arm/cpu/sa1100/start.S index 408b70d..f5318c9 100644 --- a/arch/arm/cpu/sa1100/start.S +++ b/arch/arm/cpu/sa1100/start.S @@ -96,6 +96,7 @@ cpu_init_crit: ldr r1, cpuspeed str r1, [r0, #PPCR] +#ifndef CONFIG_SKIP_LOWLEVEL_INIT_ONLY /* * before relocating, we have to setup RAM timing * because memory timing is board-dependend, you will @@ -104,6 +105,7 @@ cpu_init_crit: mov ip, lr bl lowlevel_init mov lr, ip +#endif /* * disable MMU stuff and enable I-cache |