[U-Boot] QSPI XIP boot on am437x

[Vignesh R <vigneshr@ti.com>]

Hi,

On 11/11/2015 02:33 PM, Albert ARIBAUD wrote:

[...]

> Alternatively, you could test the patch at
> 
> 	http://patchwork.ozlabs.org/patch/542558/
> 
> Let us know if this solves your issue. If it does, then it will confirm
> the issue is with arch_setup_gd not being able to set up your GD for
> some reason.
> 
> IMPORTANT: patch 542558 is *not* a final patch (there will be at least
> a v3), and may even never land in u-boot/master; but some equivalent will
> eventually do. Right now, patch 542558 is only a way to test if your
> issue is a GD one.
> 

The above patch affects the code that executes after s_init(), therefore
I don't think above patch matters (_main is run after s_init()).

As you said in your first reply "If s_init() runs before
board_init_f_mem(), then you must move it to
run after board_init_f_mem().", this is the problem with my case.
s_init() is running *before* setting up of global_data in
arch/arm/lib/crt0.S (in _main), hence IMO, calling serial_init() in
s_init() is wrong. This has to be moved to board_init_f() (in
arch/arm/cpu/armv7/am33xx/board.c).
The comment in arch/arm/cpu/armv7/lowlevel_init.S that calls s_init()
also says *not* to access global_data and not to try to start console.
Therefore, I intend to do something like this:

diff --git a/arch/arm/cpu/armv7/am33xx/board.c
b/arch/arm/cpu/armv7/am33xx/board.c
index bd14326cf479..351fc37b0483 100644
--- a/arch/arm/cpu/armv7/am33xx/board.c
+++ b/arch/arm/cpu/armv7/am33xx/board.c
@@ -256,6 +256,11 @@ void board_init_f(ulong dummy)
 {
        board_early_init_f();
        sdram_init();
+#if defined(CONFIG_NOR_BOOT) || defined(CONFIG_QSPI_BOOT)
+       gd->baudrate = CONFIG_BAUDRATE;
+       serial_init();
+       gd->have_console = 1;
+#endif
 }
 #endif /* end  CONFIG_SPL_BUILD */

@@ -273,12 +278,6 @@ void s_init(void)
        set_uart_mux_conf();
        setup_clocks_for_console();
        uart_soft_reset();
-#if defined(CONFIG_NOR_BOOT) || defined(CONFIG_QSPI_BOOT)
-       /* TODO: This does not work, gd is not available yet */
-       gd->baudrate = CONFIG_BAUDRATE;
-       serial_init();
-       gd->have_console = 1;
-#endif
 #if defined(CONFIG_SPL_AM33XX_ENABLE_RTC32K_OSC)
        /* Enable RTC32K clock */
        rtc32k_enable();


Do you see any issues with above change?
-- 
Regards
Vignesh