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ARM: uniphier: support USB boot mode for ProXstream2 / PH1-LD6b SoC

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The USB boot code is too fat and complicated to be included in SPL
(at least for now).  So, it was implemented as a separate project
(what we call USB-loader).

The expected boot sequence is as follows:

  Boot ROM -> USB-loader -> SPL -> U-Boot proper

The USB-loader loads the SPL and U-Boot proper from a USB memory
onto the locked L2 cache.  Then, SPL needs to copy the U-Boot proper
to DRAM, so this mode looks like a NOR boot from the view of SPL.
However, we want to distinguish between (genuine) NOR boot and USB
boot in some places.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
This commit is contained in:
Masahiro Yamada
2016-02-02 21:11:31 +09:00
parent a89be270e7
commit fec4816387
4 changed files with 22 additions and 2 deletions
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11
arch/arm/mach-uniphier/boot-mode/boot-mode.c
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@@ -11,7 +11,7 @@
#include "../soc-info.h"
#include "boot-device.h"
u32 spl_boot_device(void)
u32 spl_boot_device_raw(void)
{
if (boot_is_swapped())
return BOOT_DEVICE_NOR;
@@ -43,3 +43,12 @@ u32 spl_boot_device(void)
return BOOT_DEVICE_NONE;
}
}
u32 spl_boot_device(void)
{
u32 ret;
ret = spl_boot_device_raw();
return ret == BOOT_DEVICE_USB ? BOOT_DEVICE_NOR : ret;
}