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Gigabeat S: Remove unwanted partitions on the fly

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Windows now ignores the hidden flag, so just nullify the entries
to hide depending upon whether or not bootloader install mode is
activated.

Change-Id: I00d0797e40ea3b5f5d5d8e1243b50cfcdd029bb4
This commit is contained in:
Michael Sevakis 2018-01-14 08:23:48 -05:00
parent 11437662c4
commit a1123de28f
1 changed files with 18 additions and 16 deletions
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34
firmware/target/arm/imx31/gigabeat-s/usb-gigabeat-s.c
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@ -147,9 +147,17 @@ void usb_drv_int_enable(bool enable)
void usb_fix_mbr(unsigned char *mbr) void usb_fix_mbr(unsigned char *mbr)
{ {
unsigned char* p = mbr + 0x1be; unsigned char* p = mbr + 0x1be;
char tmp[16];
/* The Gigabeat S factory partition table contains invalid values for the /* Windows ignores the partition flags and mounts the first partition it
sees when the device reports itself as removable. Swap the partitions
so the data partition appears to be partition 0. Mark the boot
partition 0 as hidden and make it partition 1.
Update 2018-01-14: Windows shows it if exists, so long as it can mount
it. Resort to not exposing entries that we want hidden.
*/
/* The Gigabeat S factory partition table contains invalid values for the
"active" flag in the MBR. This prevents at least the Linux kernel "active" flag in the MBR. This prevents at least the Linux kernel
from accepting the partition table, so we fix it on-the-fly. */ from accepting the partition table, so we fix it on-the-fly. */
p[0x00] &= 0x80; p[0x00] &= 0x80;
@ -158,18 +166,12 @@ void usb_fix_mbr(unsigned char *mbr)
p[0x30] &= 0x80; p[0x30] &= 0x80;
if (bootloader_install_mode) if (bootloader_install_mode)
return; {
memset(&p[0x10], 0x00, 0x30); /* Hide non-boot partitions */
/* Windows ignores the partition flags and mounts the first partition it }
sees when the device reports itself as removable. Swap the partitions else
so the data partition appears to be partition 0. Mark the boot {
partition 0 as hidden and make it partition 1. */ memmove(&p[0x00], &p[0x10], 0x30); /* Hide boot partition */
memset(&p[0x30], 0x00, 0x10);
/* Mark the first partition as hidden */ }
p[0x04] |= 0x10;
/* Swap first and second partitions */
memcpy(tmp, &p[0x00], 16);
memcpy(&p[0x00], &p[0x10], 16);
memcpy(&p[0x10], tmp, 16);
} }