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sunxi: FEL - Add the ability to recognize and auto-import uEnv-style data

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The patch converts one of the "reserved" fields in the sunxi SPL
header to a fel_uEnv_length entry. When booting over USB ("FEL
mode"), this enables the sunxi-fel utility to pass the string
length of uEnv.txt compatible data; at the same time requesting
that this data be imported into the U-Boot environment.

If parse_spl_header() in the sunxi board.c encounters a non-zero
value in this header field, it will therefore call himport_r() to
merge the string (lines) passed via FEL into the default settings.
Environment vars can be changed this way even before U-Boot will
attempt to autoboot - specifically, this also allows overriding
"bootcmd".

With fel_script_addr set and a zero fel_uEnv_length, U-Boot is
safe to assume that data in .scr format (a mkimage-type script)
was passed at fel_script_addr, and will handle it using the
existing mechanism ("bootcmd_fel").

Signed-off-by: Bernhard Nortmann <bernhard.nortmann@web.de>
Acked-by: Siarhei Siamashka <siarhei.siamashka@gmail.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
This commit is contained in:
Bernhard Nortmann 2016-06-09 07:37:35 +02:00 committed by Hans de Goede
parent 19e99fb4ff
commit 320e0570e6
2 changed files with 29 additions and 9 deletions
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9
arch/arm/include/asm/arch-sunxi/spl.h
View file

@ -51,7 +51,14 @@ struct boot_file_head {
uint8_t spl_signature[4];
};
uint32_t fel_script_address;
uint32_t reserved1[3];
/*
* If the fel_uEnv_length member below is set to a non-zero value,
* it specifies the size (byte count) of data at fel_script_address.
* At the same time this indicates that the data is in uEnv.txt
* compatible format, ready to be imported via "env import -t".
*/
uint32_t fel_uEnv_length;
uint32_t reserved1[2];
uint32_t boot_media; /* written here by the boot ROM */
uint32_t reserved2[5]; /* padding, align to 64 bytes */
};

29
board/sunxi/board.c
View file

@ -573,6 +573,7 @@ void get_board_serial(struct tag_serialnr *serialnr)
#if !defined(CONFIG_SPL_BUILD)
#include <asm/arch/spl.h>
#include <environment.h>
/*
* Check the SPL header for the "sunxi" variant. If found: parse values
@ -582,17 +583,29 @@ void get_board_serial(struct tag_serialnr *serialnr)
static void parse_spl_header(const uint32_t spl_addr)
{
struct boot_file_head *spl = (void *)(ulong)spl_addr;
if (memcmp(spl->spl_signature, SPL_SIGNATURE, 3) == 0) {
uint8_t spl_header_version = spl->spl_signature[3];
if (spl_header_version == SPL_HEADER_VERSION) {
if (spl->fel_script_address)
setenv_hex("fel_scriptaddr",
spl->fel_script_address);
return;
}
if (memcmp(spl->spl_signature, SPL_SIGNATURE, 3) != 0)
return; /* signature mismatch, no usable header */
uint8_t spl_header_version = spl->spl_signature[3];
if (spl_header_version != SPL_HEADER_VERSION) {
printf("sunxi SPL version mismatch: expected %u, got %u\n",
SPL_HEADER_VERSION, spl_header_version);
return;
}
if (!spl->fel_script_address)
return;
if (spl->fel_uEnv_length != 0) {
/*
* data is expected in uEnv.txt compatible format, so "env
* import -t" the string(s) at fel_script_address right away.
*/
himport_r(&env_htab, (char *)spl->fel_script_address,
spl->fel_uEnv_length, '\n', H_NOCLEAR, 0, 0, NULL);
return;
}
/* otherwise assume .scr format (mkimage-type script) */
setenv_hex("fel_scriptaddr", spl->fel_script_address);
}
#endif