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| author | Simon Glass <sjg@chromium.org> | 2016-03-11 22:06:51 -0700 |
|---|---|---|
| committer | Bin Meng <bmeng.cn@gmail.com> | 2016-03-17 10:27:24 +0800 |
| commit | e4d6ab0c2cb8456f80d0ee4e123a34029d5a5c41 (patch) | |
| tree | 5be75f2ce6cb4cf73183817fe8b301032c8f775d /common | |
| parent | 8226a3e99f1c1e7ded648721d1e16118453761e5 (diff) | |
| download | u-boot-imx-e4d6ab0c2cb8456f80d0ee4e123a34029d5a5c41.zip u-boot-imx-e4d6ab0c2cb8456f80d0ee4e123a34029d5a5c41.tar.gz u-boot-imx-e4d6ab0c2cb8456f80d0ee4e123a34029d5a5c41.tar.bz2 | |
x86: Allow use of serial soon after relocation
At present on x86 machines with use cache-as-RAM, the memory goes away just
before board_init_r() is called. This means that serial drivers are
no-longer unavailable, until initr_dm() it called, etc.
Any attempt to use printf() within this period will cause a hang.
To fix this, mark the serial devices as 'unavailable' when it is no-longer
available. Bring it back when serial_initialize() is called. This means that
the debug UART will be used instead for this period.
Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Diffstat (limited to 'common')
| -rw-r--r-- | common/board_f.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/common/board_f.c b/common/board_f.c index 622093a..109025a 100644 --- a/common/board_f.c +++ b/common/board_f.c @@ -1096,6 +1096,13 @@ void board_init_f_r(void) hang(); /* + * The pre-relocation drivers may be using memory that has now gone + * away. Mark serial as unavailable - this will fall back to the debug + * UART if available. + */ + gd->flags &= ~GD_FLG_SERIAL_READY; + + /* * U-Boot has been copied into SDRAM, the BSS has been cleared etc. * Transfer execution from Flash to RAM by calculating the address * of the in-RAM copy of board_init_r() and calling it |